^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1) // SPDX-License-Identifier: GPL-2.0
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3) * Support for dynamic device trees.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 5) * On some platforms, the device tree can be manipulated at runtime.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 6) * The routines in this section support adding, removing and changing
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 7) * device tree nodes.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 8) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 9)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 10) #define pr_fmt(fmt) "OF: " fmt
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 11)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 12) #include <linux/of.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 13) #include <linux/spinlock.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 14) #include <linux/slab.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 15) #include <linux/string.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 16) #include <linux/proc_fs.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 17)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 18) #include "of_private.h"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 19)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 20) static struct device_node *kobj_to_device_node(struct kobject *kobj)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 21) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 22) return container_of(kobj, struct device_node, kobj);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 23) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 24)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 25) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 26) * of_node_get() - Increment refcount of a node
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 27) * @node: Node to inc refcount, NULL is supported to simplify writing of
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 28) * callers
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 29) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 30) * Returns node.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 31) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 32) struct device_node *of_node_get(struct device_node *node)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 33) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 34) if (node)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 35) kobject_get(&node->kobj);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 36) return node;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 37) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 38) EXPORT_SYMBOL(of_node_get);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 39)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 40) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 41) * of_node_put() - Decrement refcount of a node
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 42) * @node: Node to dec refcount, NULL is supported to simplify writing of
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 43) * callers
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 44) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 45) void of_node_put(struct device_node *node)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 46) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 47) if (node)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 48) kobject_put(&node->kobj);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 49) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 50) EXPORT_SYMBOL(of_node_put);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 51)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 52) static BLOCKING_NOTIFIER_HEAD(of_reconfig_chain);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 53)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 54) int of_reconfig_notifier_register(struct notifier_block *nb)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 55) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 56) return blocking_notifier_chain_register(&of_reconfig_chain, nb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 57) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 58) EXPORT_SYMBOL_GPL(of_reconfig_notifier_register);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 59)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 60) int of_reconfig_notifier_unregister(struct notifier_block *nb)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 61) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 62) return blocking_notifier_chain_unregister(&of_reconfig_chain, nb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 63) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 64) EXPORT_SYMBOL_GPL(of_reconfig_notifier_unregister);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 65)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 66) #ifdef DEBUG
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 67) const char *action_names[] = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 68) [OF_RECONFIG_ATTACH_NODE] = "ATTACH_NODE",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 69) [OF_RECONFIG_DETACH_NODE] = "DETACH_NODE",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 70) [OF_RECONFIG_ADD_PROPERTY] = "ADD_PROPERTY",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 71) [OF_RECONFIG_REMOVE_PROPERTY] = "REMOVE_PROPERTY",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 72) [OF_RECONFIG_UPDATE_PROPERTY] = "UPDATE_PROPERTY",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 73) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 74) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 75)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 76) int of_reconfig_notify(unsigned long action, struct of_reconfig_data *p)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 77) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 78) int rc;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 79) #ifdef DEBUG
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 80) struct of_reconfig_data *pr = p;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 81)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 82) switch (action) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 83) case OF_RECONFIG_ATTACH_NODE:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 84) case OF_RECONFIG_DETACH_NODE:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 85) pr_debug("notify %-15s %pOF\n", action_names[action],
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 86) pr->dn);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 87) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 88) case OF_RECONFIG_ADD_PROPERTY:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 89) case OF_RECONFIG_REMOVE_PROPERTY:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 90) case OF_RECONFIG_UPDATE_PROPERTY:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 91) pr_debug("notify %-15s %pOF:%s\n", action_names[action],
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 92) pr->dn, pr->prop->name);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 93) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 94)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 95) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 96) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 97) rc = blocking_notifier_call_chain(&of_reconfig_chain, action, p);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 98) return notifier_to_errno(rc);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 99) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 100)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 101) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 102) * of_reconfig_get_state_change() - Returns new state of device
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 103) * @action - action of the of notifier
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 104) * @arg - argument of the of notifier
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 105) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 106) * Returns the new state of a device based on the notifier used.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 107) * Returns 0 on device going from enabled to disabled, 1 on device
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 108) * going from disabled to enabled and -1 on no change.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 109) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 110) int of_reconfig_get_state_change(unsigned long action, struct of_reconfig_data *pr)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 111) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 112) struct property *prop, *old_prop = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 113) int is_status, status_state, old_status_state, prev_state, new_state;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 114)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 115) /* figure out if a device should be created or destroyed */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 116) switch (action) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 117) case OF_RECONFIG_ATTACH_NODE:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 118) case OF_RECONFIG_DETACH_NODE:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 119) prop = of_find_property(pr->dn, "status", NULL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 120) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 121) case OF_RECONFIG_ADD_PROPERTY:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 122) case OF_RECONFIG_REMOVE_PROPERTY:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 123) prop = pr->prop;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 124) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 125) case OF_RECONFIG_UPDATE_PROPERTY:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 126) prop = pr->prop;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 127) old_prop = pr->old_prop;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 128) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 129) default:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 130) return OF_RECONFIG_NO_CHANGE;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 131) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 132)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 133) is_status = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 134) status_state = -1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 135) old_status_state = -1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 136) prev_state = -1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 137) new_state = -1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 138)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 139) if (prop && !strcmp(prop->name, "status")) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 140) is_status = 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 141) status_state = !strcmp(prop->value, "okay") ||
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 142) !strcmp(prop->value, "ok");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 143) if (old_prop)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 144) old_status_state = !strcmp(old_prop->value, "okay") ||
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 145) !strcmp(old_prop->value, "ok");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 146) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 147)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 148) switch (action) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 149) case OF_RECONFIG_ATTACH_NODE:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 150) prev_state = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 151) /* -1 & 0 status either missing or okay */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 152) new_state = status_state != 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 153) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 154) case OF_RECONFIG_DETACH_NODE:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 155) /* -1 & 0 status either missing or okay */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 156) prev_state = status_state != 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 157) new_state = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 158) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 159) case OF_RECONFIG_ADD_PROPERTY:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 160) if (is_status) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 161) /* no status property -> enabled (legacy) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 162) prev_state = 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 163) new_state = status_state;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 164) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 165) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 166) case OF_RECONFIG_REMOVE_PROPERTY:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 167) if (is_status) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 168) prev_state = status_state;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 169) /* no status property -> enabled (legacy) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 170) new_state = 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 171) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 172) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 173) case OF_RECONFIG_UPDATE_PROPERTY:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 174) if (is_status) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 175) prev_state = old_status_state != 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 176) new_state = status_state != 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 177) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 178) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 179) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 180)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 181) if (prev_state == new_state)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 182) return OF_RECONFIG_NO_CHANGE;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 183)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 184) return new_state ? OF_RECONFIG_CHANGE_ADD : OF_RECONFIG_CHANGE_REMOVE;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 185) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 186) EXPORT_SYMBOL_GPL(of_reconfig_get_state_change);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 187)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 188) int of_property_notify(int action, struct device_node *np,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 189) struct property *prop, struct property *oldprop)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 190) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 191) struct of_reconfig_data pr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 192)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 193) /* only call notifiers if the node is attached */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 194) if (!of_node_is_attached(np))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 195) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 196)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 197) pr.dn = np;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 198) pr.prop = prop;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 199) pr.old_prop = oldprop;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 200) return of_reconfig_notify(action, &pr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 201) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 202)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 203) static void __of_attach_node(struct device_node *np)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 204) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 205) const __be32 *phandle;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 206) int sz;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 207)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 208) if (!of_node_check_flag(np, OF_OVERLAY)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 209) np->name = __of_get_property(np, "name", NULL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 210) if (!np->name)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 211) np->name = "<NULL>";
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 212)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 213) phandle = __of_get_property(np, "phandle", &sz);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 214) if (!phandle)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 215) phandle = __of_get_property(np, "linux,phandle", &sz);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 216) if (IS_ENABLED(CONFIG_PPC_PSERIES) && !phandle)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 217) phandle = __of_get_property(np, "ibm,phandle", &sz);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 218) if (phandle && (sz >= 4))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 219) np->phandle = be32_to_cpup(phandle);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 220) else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 221) np->phandle = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 222) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 223)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 224) np->child = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 225) np->sibling = np->parent->child;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 226) np->parent->child = np;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 227) of_node_clear_flag(np, OF_DETACHED);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 228) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 229)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 230) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 231) * of_attach_node() - Plug a device node into the tree and global list.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 232) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 233) int of_attach_node(struct device_node *np)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 234) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 235) struct of_reconfig_data rd;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 236) unsigned long flags;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 237)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 238) memset(&rd, 0, sizeof(rd));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 239) rd.dn = np;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 240)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 241) mutex_lock(&of_mutex);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 242) raw_spin_lock_irqsave(&devtree_lock, flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 243) __of_attach_node(np);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 244) raw_spin_unlock_irqrestore(&devtree_lock, flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 245)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 246) __of_attach_node_sysfs(np);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 247) mutex_unlock(&of_mutex);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 248)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 249) of_reconfig_notify(OF_RECONFIG_ATTACH_NODE, &rd);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 250)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 251) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 252) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 253)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 254) void __of_detach_node(struct device_node *np)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 255) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 256) struct device_node *parent;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 257)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 258) if (WARN_ON(of_node_check_flag(np, OF_DETACHED)))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 259) return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 260)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 261) parent = np->parent;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 262) if (WARN_ON(!parent))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 263) return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 264)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 265) if (parent->child == np)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 266) parent->child = np->sibling;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 267) else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 268) struct device_node *prevsib;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 269) for (prevsib = np->parent->child;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 270) prevsib->sibling != np;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 271) prevsib = prevsib->sibling)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 272) ;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 273) prevsib->sibling = np->sibling;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 274) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 275)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 276) of_node_set_flag(np, OF_DETACHED);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 277)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 278) /* race with of_find_node_by_phandle() prevented by devtree_lock */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 279) __of_phandle_cache_inv_entry(np->phandle);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 280) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 281)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 282) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 283) * of_detach_node() - "Unplug" a node from the device tree.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 284) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 285) int of_detach_node(struct device_node *np)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 286) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 287) struct of_reconfig_data rd;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 288) unsigned long flags;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 289)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 290) memset(&rd, 0, sizeof(rd));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 291) rd.dn = np;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 292)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 293) mutex_lock(&of_mutex);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 294) raw_spin_lock_irqsave(&devtree_lock, flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 295) __of_detach_node(np);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 296) raw_spin_unlock_irqrestore(&devtree_lock, flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 297)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 298) __of_detach_node_sysfs(np);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 299) mutex_unlock(&of_mutex);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 300)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 301) of_reconfig_notify(OF_RECONFIG_DETACH_NODE, &rd);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 302)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 303) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 304) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 305) EXPORT_SYMBOL_GPL(of_detach_node);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 306)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 307) static void property_list_free(struct property *prop_list)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 308) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 309) struct property *prop, *next;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 310)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 311) for (prop = prop_list; prop != NULL; prop = next) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 312) next = prop->next;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 313) kfree(prop->name);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 314) kfree(prop->value);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 315) kfree(prop);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 316) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 317) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 318)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 319) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 320) * of_node_release() - release a dynamically allocated node
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 321) * @kref: kref element of the node to be released
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 322) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 323) * In of_node_put() this function is passed to kref_put() as the destructor.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 324) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 325) void of_node_release(struct kobject *kobj)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 326) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 327) struct device_node *node = kobj_to_device_node(kobj);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 328)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 329) /* We should never be releasing nodes that haven't been detached. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 330) if (!of_node_check_flag(node, OF_DETACHED)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 331) pr_err("ERROR: Bad of_node_put() on %pOF\n", node);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 332) dump_stack();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 333) return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 334) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 335) if (!of_node_check_flag(node, OF_DYNAMIC))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 336) return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 337)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 338) if (of_node_check_flag(node, OF_OVERLAY)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 339)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 340) if (!of_node_check_flag(node, OF_OVERLAY_FREE_CSET)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 341) /* premature refcount of zero, do not free memory */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 342) pr_err("ERROR: memory leak before free overlay changeset, %pOF\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 343) node);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 344) return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 345) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 346)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 347) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 348) * If node->properties non-empty then properties were added
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 349) * to this node either by different overlay that has not
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 350) * yet been removed, or by a non-overlay mechanism.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 351) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 352) if (node->properties)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 353) pr_err("ERROR: %s(), unexpected properties in %pOF\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 354) __func__, node);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 355) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 356)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 357) property_list_free(node->properties);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 358) property_list_free(node->deadprops);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 359) fwnode_links_purge(of_fwnode_handle(node));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 360)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 361) kfree(node->full_name);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 362) kfree(node->data);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 363) kfree(node);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 364) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 365)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 366) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 367) * __of_prop_dup - Copy a property dynamically.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 368) * @prop: Property to copy
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 369) * @allocflags: Allocation flags (typically pass GFP_KERNEL)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 370) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 371) * Copy a property by dynamically allocating the memory of both the
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 372) * property structure and the property name & contents. The property's
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 373) * flags have the OF_DYNAMIC bit set so that we can differentiate between
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 374) * dynamically allocated properties and not.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 375) * Returns the newly allocated property or NULL on out of memory error.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 376) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 377) struct property *__of_prop_dup(const struct property *prop, gfp_t allocflags)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 378) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 379) struct property *new;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 380)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 381) new = kzalloc(sizeof(*new), allocflags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 382) if (!new)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 383) return NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 384)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 385) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 386) * NOTE: There is no check for zero length value.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 387) * In case of a boolean property, this will allocate a value
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 388) * of zero bytes. We do this to work around the use
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 389) * of of_get_property() calls on boolean values.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 390) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 391) new->name = kstrdup(prop->name, allocflags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 392) new->value = kmemdup(prop->value, prop->length, allocflags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 393) new->length = prop->length;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 394) if (!new->name || !new->value)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 395) goto err_free;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 396)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 397) /* mark the property as dynamic */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 398) of_property_set_flag(new, OF_DYNAMIC);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 399)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 400) return new;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 401)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 402) err_free:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 403) kfree(new->name);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 404) kfree(new->value);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 405) kfree(new);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 406) return NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 407) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 408)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 409) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 410) * __of_node_dup() - Duplicate or create an empty device node dynamically.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 411) * @np: if not NULL, contains properties to be duplicated in new node
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 412) * @full_name: string value to be duplicated into new node's full_name field
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 413) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 414) * Create a device tree node, optionally duplicating the properties of
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 415) * another node. The node data are dynamically allocated and all the node
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 416) * flags have the OF_DYNAMIC & OF_DETACHED bits set.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 417) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 418) * Returns the newly allocated node or NULL on out of memory error.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 419) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 420) struct device_node *__of_node_dup(const struct device_node *np,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 421) const char *full_name)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 422) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 423) struct device_node *node;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 424)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 425) node = kzalloc(sizeof(*node), GFP_KERNEL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 426) if (!node)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 427) return NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 428) node->full_name = kstrdup(full_name, GFP_KERNEL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 429) if (!node->full_name) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 430) kfree(node);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 431) return NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 432) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 433)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 434) of_node_set_flag(node, OF_DYNAMIC);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 435) of_node_set_flag(node, OF_DETACHED);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 436) of_node_init(node);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 437)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 438) /* Iterate over and duplicate all properties */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 439) if (np) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 440) struct property *pp, *new_pp;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 441) for_each_property_of_node(np, pp) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 442) new_pp = __of_prop_dup(pp, GFP_KERNEL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 443) if (!new_pp)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 444) goto err_prop;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 445) if (__of_add_property(node, new_pp)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 446) kfree(new_pp->name);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 447) kfree(new_pp->value);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 448) kfree(new_pp);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 449) goto err_prop;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 450) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 451) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 452) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 453) return node;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 454)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 455) err_prop:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 456) of_node_put(node); /* Frees the node and properties */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 457) return NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 458) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 459)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 460) static void __of_changeset_entry_destroy(struct of_changeset_entry *ce)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 461) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 462) if (ce->action == OF_RECONFIG_ATTACH_NODE &&
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 463) of_node_check_flag(ce->np, OF_OVERLAY)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 464) if (kref_read(&ce->np->kobj.kref) > 1) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 465) pr_err("ERROR: memory leak, expected refcount 1 instead of %d, of_node_get()/of_node_put() unbalanced - destroy cset entry: attach overlay node %pOF\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 466) kref_read(&ce->np->kobj.kref), ce->np);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 467) } else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 468) of_node_set_flag(ce->np, OF_OVERLAY_FREE_CSET);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 469) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 470) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 471)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 472) of_node_put(ce->np);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 473) list_del(&ce->node);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 474) kfree(ce);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 475) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 476)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 477) #ifdef DEBUG
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 478) static void __of_changeset_entry_dump(struct of_changeset_entry *ce)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 479) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 480) switch (ce->action) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 481) case OF_RECONFIG_ADD_PROPERTY:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 482) case OF_RECONFIG_REMOVE_PROPERTY:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 483) case OF_RECONFIG_UPDATE_PROPERTY:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 484) pr_debug("cset<%p> %-15s %pOF/%s\n", ce, action_names[ce->action],
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 485) ce->np, ce->prop->name);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 486) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 487) case OF_RECONFIG_ATTACH_NODE:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 488) case OF_RECONFIG_DETACH_NODE:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 489) pr_debug("cset<%p> %-15s %pOF\n", ce, action_names[ce->action],
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 490) ce->np);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 491) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 492) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 493) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 494) #else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 495) static inline void __of_changeset_entry_dump(struct of_changeset_entry *ce)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 496) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 497) /* empty */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 498) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 499) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 500)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 501) static void __of_changeset_entry_invert(struct of_changeset_entry *ce,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 502) struct of_changeset_entry *rce)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 503) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 504) memcpy(rce, ce, sizeof(*rce));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 505)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 506) switch (ce->action) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 507) case OF_RECONFIG_ATTACH_NODE:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 508) rce->action = OF_RECONFIG_DETACH_NODE;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 509) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 510) case OF_RECONFIG_DETACH_NODE:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 511) rce->action = OF_RECONFIG_ATTACH_NODE;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 512) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 513) case OF_RECONFIG_ADD_PROPERTY:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 514) rce->action = OF_RECONFIG_REMOVE_PROPERTY;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 515) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 516) case OF_RECONFIG_REMOVE_PROPERTY:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 517) rce->action = OF_RECONFIG_ADD_PROPERTY;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 518) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 519) case OF_RECONFIG_UPDATE_PROPERTY:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 520) rce->old_prop = ce->prop;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 521) rce->prop = ce->old_prop;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 522) /* update was used but original property did not exist */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 523) if (!rce->prop) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 524) rce->action = OF_RECONFIG_REMOVE_PROPERTY;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 525) rce->prop = ce->prop;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 526) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 527) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 528) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 529) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 530)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 531) static int __of_changeset_entry_notify(struct of_changeset_entry *ce,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 532) bool revert)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 533) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 534) struct of_reconfig_data rd;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 535) struct of_changeset_entry ce_inverted;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 536) int ret = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 537)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 538) if (revert) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 539) __of_changeset_entry_invert(ce, &ce_inverted);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 540) ce = &ce_inverted;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 541) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 542)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 543) switch (ce->action) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 544) case OF_RECONFIG_ATTACH_NODE:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 545) case OF_RECONFIG_DETACH_NODE:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 546) memset(&rd, 0, sizeof(rd));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 547) rd.dn = ce->np;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 548) ret = of_reconfig_notify(ce->action, &rd);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 549) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 550) case OF_RECONFIG_ADD_PROPERTY:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 551) case OF_RECONFIG_REMOVE_PROPERTY:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 552) case OF_RECONFIG_UPDATE_PROPERTY:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 553) ret = of_property_notify(ce->action, ce->np, ce->prop, ce->old_prop);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 554) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 555) default:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 556) pr_err("invalid devicetree changeset action: %i\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 557) (int)ce->action);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 558) ret = -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 559) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 560)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 561) if (ret)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 562) pr_err("changeset notifier error @%pOF\n", ce->np);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 563) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 564) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 565)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 566) static int __of_changeset_entry_apply(struct of_changeset_entry *ce)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 567) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 568) struct property *old_prop, **propp;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 569) unsigned long flags;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 570) int ret = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 571)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 572) __of_changeset_entry_dump(ce);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 573)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 574) raw_spin_lock_irqsave(&devtree_lock, flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 575) switch (ce->action) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 576) case OF_RECONFIG_ATTACH_NODE:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 577) __of_attach_node(ce->np);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 578) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 579) case OF_RECONFIG_DETACH_NODE:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 580) __of_detach_node(ce->np);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 581) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 582) case OF_RECONFIG_ADD_PROPERTY:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 583) /* If the property is in deadprops then it must be removed */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 584) for (propp = &ce->np->deadprops; *propp; propp = &(*propp)->next) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 585) if (*propp == ce->prop) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 586) *propp = ce->prop->next;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 587) ce->prop->next = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 588) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 589) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 590) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 591)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 592) ret = __of_add_property(ce->np, ce->prop);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 593) if (ret) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 594) pr_err("changeset: add_property failed @%pOF/%s\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 595) ce->np,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 596) ce->prop->name);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 597) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 598) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 599) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 600) case OF_RECONFIG_REMOVE_PROPERTY:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 601) ret = __of_remove_property(ce->np, ce->prop);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 602) if (ret) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 603) pr_err("changeset: remove_property failed @%pOF/%s\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 604) ce->np,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 605) ce->prop->name);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 606) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 607) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 608) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 609)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 610) case OF_RECONFIG_UPDATE_PROPERTY:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 611) /* If the property is in deadprops then it must be removed */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 612) for (propp = &ce->np->deadprops; *propp; propp = &(*propp)->next) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 613) if (*propp == ce->prop) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 614) *propp = ce->prop->next;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 615) ce->prop->next = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 616) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 617) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 618) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 619)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 620) ret = __of_update_property(ce->np, ce->prop, &old_prop);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 621) if (ret) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 622) pr_err("changeset: update_property failed @%pOF/%s\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 623) ce->np,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 624) ce->prop->name);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 625) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 626) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 627) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 628) default:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 629) ret = -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 630) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 631) raw_spin_unlock_irqrestore(&devtree_lock, flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 632)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 633) if (ret)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 634) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 635)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 636) switch (ce->action) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 637) case OF_RECONFIG_ATTACH_NODE:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 638) __of_attach_node_sysfs(ce->np);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 639) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 640) case OF_RECONFIG_DETACH_NODE:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 641) __of_detach_node_sysfs(ce->np);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 642) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 643) case OF_RECONFIG_ADD_PROPERTY:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 644) /* ignore duplicate names */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 645) __of_add_property_sysfs(ce->np, ce->prop);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 646) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 647) case OF_RECONFIG_REMOVE_PROPERTY:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 648) __of_remove_property_sysfs(ce->np, ce->prop);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 649) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 650) case OF_RECONFIG_UPDATE_PROPERTY:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 651) __of_update_property_sysfs(ce->np, ce->prop, ce->old_prop);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 652) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 653) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 654)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 655) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 656) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 657)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 658) static inline int __of_changeset_entry_revert(struct of_changeset_entry *ce)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 659) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 660) struct of_changeset_entry ce_inverted;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 661)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 662) __of_changeset_entry_invert(ce, &ce_inverted);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 663) return __of_changeset_entry_apply(&ce_inverted);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 664) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 665)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 666) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 667) * of_changeset_init - Initialize a changeset for use
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 668) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 669) * @ocs: changeset pointer
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 670) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 671) * Initialize a changeset structure
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 672) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 673) void of_changeset_init(struct of_changeset *ocs)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 674) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 675) memset(ocs, 0, sizeof(*ocs));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 676) INIT_LIST_HEAD(&ocs->entries);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 677) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 678) EXPORT_SYMBOL_GPL(of_changeset_init);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 679)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 680) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 681) * of_changeset_destroy - Destroy a changeset
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 682) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 683) * @ocs: changeset pointer
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 684) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 685) * Destroys a changeset. Note that if a changeset is applied,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 686) * its changes to the tree cannot be reverted.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 687) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 688) void of_changeset_destroy(struct of_changeset *ocs)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 689) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 690) struct of_changeset_entry *ce, *cen;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 691)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 692) list_for_each_entry_safe_reverse(ce, cen, &ocs->entries, node)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 693) __of_changeset_entry_destroy(ce);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 694) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 695) EXPORT_SYMBOL_GPL(of_changeset_destroy);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 696)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 697) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 698) * Apply the changeset entries in @ocs.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 699) * If apply fails, an attempt is made to revert the entries that were
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 700) * successfully applied.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 701) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 702) * If multiple revert errors occur then only the final revert error is reported.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 703) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 704) * Returns 0 on success, a negative error value in case of an error.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 705) * If a revert error occurs, it is returned in *ret_revert.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 706) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 707) int __of_changeset_apply_entries(struct of_changeset *ocs, int *ret_revert)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 708) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 709) struct of_changeset_entry *ce;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 710) int ret, ret_tmp;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 711)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 712) pr_debug("changeset: applying...\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 713) list_for_each_entry(ce, &ocs->entries, node) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 714) ret = __of_changeset_entry_apply(ce);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 715) if (ret) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 716) pr_err("Error applying changeset (%d)\n", ret);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 717) list_for_each_entry_continue_reverse(ce, &ocs->entries,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 718) node) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 719) ret_tmp = __of_changeset_entry_revert(ce);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 720) if (ret_tmp)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 721) *ret_revert = ret_tmp;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 722) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 723) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 724) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 725) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 726)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 727) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 728) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 729)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 730) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 731) * Returns 0 on success, a negative error value in case of an error.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 732) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 733) * If multiple changeset entry notification errors occur then only the
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 734) * final notification error is reported.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 735) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 736) int __of_changeset_apply_notify(struct of_changeset *ocs)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 737) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 738) struct of_changeset_entry *ce;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 739) int ret = 0, ret_tmp;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 740)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 741) pr_debug("changeset: emitting notifiers.\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 742)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 743) /* drop the global lock while emitting notifiers */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 744) mutex_unlock(&of_mutex);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 745) list_for_each_entry(ce, &ocs->entries, node) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 746) ret_tmp = __of_changeset_entry_notify(ce, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 747) if (ret_tmp)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 748) ret = ret_tmp;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 749) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 750) mutex_lock(&of_mutex);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 751) pr_debug("changeset: notifiers sent.\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 752)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 753) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 754) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 755)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 756) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 757) * Returns 0 on success, a negative error value in case of an error.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 758) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 759) * If a changeset entry apply fails, an attempt is made to revert any
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 760) * previous entries in the changeset. If any of the reverts fails,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 761) * that failure is not reported. Thus the state of the device tree
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 762) * is unknown if an apply error occurs.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 763) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 764) static int __of_changeset_apply(struct of_changeset *ocs)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 765) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 766) int ret, ret_revert = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 767)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 768) ret = __of_changeset_apply_entries(ocs, &ret_revert);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 769) if (!ret)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 770) ret = __of_changeset_apply_notify(ocs);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 771)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 772) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 773) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 774)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 775) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 776) * of_changeset_apply - Applies a changeset
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 777) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 778) * @ocs: changeset pointer
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 779) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 780) * Applies a changeset to the live tree.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 781) * Any side-effects of live tree state changes are applied here on
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 782) * success, like creation/destruction of devices and side-effects
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 783) * like creation of sysfs properties and directories.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 784) * Returns 0 on success, a negative error value in case of an error.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 785) * On error the partially applied effects are reverted.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 786) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 787) int of_changeset_apply(struct of_changeset *ocs)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 788) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 789) int ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 790)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 791) mutex_lock(&of_mutex);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 792) ret = __of_changeset_apply(ocs);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 793) mutex_unlock(&of_mutex);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 794)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 795) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 796) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 797) EXPORT_SYMBOL_GPL(of_changeset_apply);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 798)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 799) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 800) * Revert the changeset entries in @ocs.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 801) * If revert fails, an attempt is made to re-apply the entries that were
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 802) * successfully removed.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 803) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 804) * If multiple re-apply errors occur then only the final apply error is
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 805) * reported.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 806) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 807) * Returns 0 on success, a negative error value in case of an error.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 808) * If an apply error occurs, it is returned in *ret_apply.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 809) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 810) int __of_changeset_revert_entries(struct of_changeset *ocs, int *ret_apply)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 811) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 812) struct of_changeset_entry *ce;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 813) int ret, ret_tmp;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 814)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 815) pr_debug("changeset: reverting...\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 816) list_for_each_entry_reverse(ce, &ocs->entries, node) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 817) ret = __of_changeset_entry_revert(ce);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 818) if (ret) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 819) pr_err("Error reverting changeset (%d)\n", ret);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 820) list_for_each_entry_continue(ce, &ocs->entries, node) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 821) ret_tmp = __of_changeset_entry_apply(ce);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 822) if (ret_tmp)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 823) *ret_apply = ret_tmp;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 824) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 825) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 826) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 827) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 828)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 829) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 830) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 831)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 832) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 833) * If multiple changeset entry notification errors occur then only the
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 834) * final notification error is reported.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 835) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 836) int __of_changeset_revert_notify(struct of_changeset *ocs)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 837) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 838) struct of_changeset_entry *ce;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 839) int ret = 0, ret_tmp;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 840)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 841) pr_debug("changeset: emitting notifiers.\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 842)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 843) /* drop the global lock while emitting notifiers */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 844) mutex_unlock(&of_mutex);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 845) list_for_each_entry_reverse(ce, &ocs->entries, node) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 846) ret_tmp = __of_changeset_entry_notify(ce, 1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 847) if (ret_tmp)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 848) ret = ret_tmp;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 849) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 850) mutex_lock(&of_mutex);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 851) pr_debug("changeset: notifiers sent.\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 852)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 853) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 854) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 855)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 856) static int __of_changeset_revert(struct of_changeset *ocs)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 857) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 858) int ret, ret_reply;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 859)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 860) ret_reply = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 861) ret = __of_changeset_revert_entries(ocs, &ret_reply);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 862)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 863) if (!ret)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 864) ret = __of_changeset_revert_notify(ocs);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 865)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 866) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 867) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 868)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 869) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 870) * of_changeset_revert - Reverts an applied changeset
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 871) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 872) * @ocs: changeset pointer
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 873) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 874) * Reverts a changeset returning the state of the tree to what it
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 875) * was before the application.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 876) * Any side-effects like creation/destruction of devices and
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 877) * removal of sysfs properties and directories are applied.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 878) * Returns 0 on success, a negative error value in case of an error.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 879) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 880) int of_changeset_revert(struct of_changeset *ocs)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 881) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 882) int ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 883)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 884) mutex_lock(&of_mutex);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 885) ret = __of_changeset_revert(ocs);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 886) mutex_unlock(&of_mutex);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 887)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 888) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 889) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 890) EXPORT_SYMBOL_GPL(of_changeset_revert);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 891)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 892) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 893) * of_changeset_action - Add an action to the tail of the changeset list
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 894) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 895) * @ocs: changeset pointer
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 896) * @action: action to perform
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 897) * @np: Pointer to device node
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 898) * @prop: Pointer to property
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 899) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 900) * On action being one of:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 901) * + OF_RECONFIG_ATTACH_NODE
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 902) * + OF_RECONFIG_DETACH_NODE,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 903) * + OF_RECONFIG_ADD_PROPERTY
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 904) * + OF_RECONFIG_REMOVE_PROPERTY,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 905) * + OF_RECONFIG_UPDATE_PROPERTY
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 906) * Returns 0 on success, a negative error value in case of an error.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 907) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 908) int of_changeset_action(struct of_changeset *ocs, unsigned long action,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 909) struct device_node *np, struct property *prop)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 910) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 911) struct of_changeset_entry *ce;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 912)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 913) ce = kzalloc(sizeof(*ce), GFP_KERNEL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 914) if (!ce)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 915) return -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 916)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 917) /* get a reference to the node */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 918) ce->action = action;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 919) ce->np = of_node_get(np);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 920) ce->prop = prop;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 921)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 922) if (action == OF_RECONFIG_UPDATE_PROPERTY && prop)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 923) ce->old_prop = of_find_property(np, prop->name, NULL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 924)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 925) /* add it to the list */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 926) list_add_tail(&ce->node, &ocs->entries);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 927) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 928) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 929) EXPORT_SYMBOL_GPL(of_changeset_action);
Orange Pi5 kernel
Deprecated Linux kernel 5.10.110 for OrangePi 5/5B/5+ boards
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