Orange Pi5 kernel

^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)  * 	mpc5xxx_get_bus_frequency - Find the bus frequency for a device
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  4)  * 	@node:	device node
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  5)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  6)  * 	Returns bus frequency (IPS on MPC512x, IPB on MPC52xx),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  7)  * 	or 0 if the bus frequency cannot be found.
^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) #include <linux/kernel.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 11) #include <linux/of_platform.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 12) #include <linux/export.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 13) #include <asm/mpc5xxx.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 14) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 15) unsigned long mpc5xxx_get_bus_frequency(struct device_node *node)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 16) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 17) 	const unsigned int *p_bus_freq = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 18) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 19) 	of_node_get(node);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 20) 	while (node) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 21) 		p_bus_freq = of_get_property(node, "bus-frequency", NULL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 22) 		if (p_bus_freq)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 23) 			break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 24) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 25) 		node = of_get_next_parent(node);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 26) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 27) 	of_node_put(node);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 28) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 29) 	return p_bus_freq ? *p_bus_freq : 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 30) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 31) EXPORT_SYMBOL(mpc5xxx_get_bus_frequency);