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)  * Copyright (C) 2011, 2012 Cavium, Inc.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  4)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  5) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  6) #include <linux/platform_device.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  7) #include <linux/device.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  8) #include <linux/of_mdio.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  9) #include <linux/module.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 10) #include <linux/phy.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 11) #include <linux/mdio-mux.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 12) #include <linux/gpio/consumer.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 13) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 14) #define DRV_VERSION "1.1"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 15) #define DRV_DESCRIPTION "GPIO controlled MDIO bus multiplexer driver"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 16) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 17) struct mdio_mux_gpio_state {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 18) 	struct gpio_descs *gpios;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 19) 	void *mux_handle;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 20) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 21) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 22) static int mdio_mux_gpio_switch_fn(int current_child, int desired_child,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 23) 				   void *data)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 24) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 25) 	struct mdio_mux_gpio_state *s = data;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 26) 	DECLARE_BITMAP(values, BITS_PER_TYPE(desired_child));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 27) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 28) 	if (current_child == desired_child)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 29) 		return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 30) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 31) 	values[0] = desired_child;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 32) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 33) 	gpiod_set_array_value_cansleep(s->gpios->ndescs, s->gpios->desc,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 34) 				       s->gpios->info, values);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 35) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 36) 	return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 37) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 38) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 39) static int mdio_mux_gpio_probe(struct platform_device *pdev)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 40) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 41) 	struct mdio_mux_gpio_state *s;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 42) 	struct gpio_descs *gpios;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 43) 	int r;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 44) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 45) 	gpios = devm_gpiod_get_array(&pdev->dev, NULL, GPIOD_OUT_LOW);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 46) 	if (IS_ERR(gpios))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 47) 		return PTR_ERR(gpios);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 48) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 49) 	s = devm_kzalloc(&pdev->dev, sizeof(*s), GFP_KERNEL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 50) 	if (!s)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 51) 		return -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 52) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 53) 	s->gpios = gpios;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 54) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 55) 	r = mdio_mux_init(&pdev->dev, pdev->dev.of_node,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 56) 			  mdio_mux_gpio_switch_fn, &s->mux_handle, s, NULL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 57) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 58) 	if (r != 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 59) 		return r;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 60) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 61) 	pdev->dev.platform_data = s;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 62) 	return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 63) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 64) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 65) static int mdio_mux_gpio_remove(struct platform_device *pdev)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 66) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 67) 	struct mdio_mux_gpio_state *s = dev_get_platdata(&pdev->dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 68) 	mdio_mux_uninit(s->mux_handle);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 69) 	return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 70) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 71) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 72) static const struct of_device_id mdio_mux_gpio_match[] = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 73) 	{
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 74) 		.compatible = "mdio-mux-gpio",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 75) 	},
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 76) 	{
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 77) 		/* Legacy compatible property. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 78) 		.compatible = "cavium,mdio-mux-sn74cbtlv3253",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 79) 	},
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 80) 	{},
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 81) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 82) MODULE_DEVICE_TABLE(of, mdio_mux_gpio_match);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 83) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 84) static struct platform_driver mdio_mux_gpio_driver = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 85) 	.driver = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 86) 		.name		= "mdio-mux-gpio",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 87) 		.of_match_table = mdio_mux_gpio_match,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 88) 	},
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 89) 	.probe		= mdio_mux_gpio_probe,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 90) 	.remove		= mdio_mux_gpio_remove,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 91) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 92) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 93) module_platform_driver(mdio_mux_gpio_driver);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 94) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 95) MODULE_DESCRIPTION(DRV_DESCRIPTION);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 96) MODULE_VERSION(DRV_VERSION);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 97) MODULE_AUTHOR("David Daney");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 98) MODULE_LICENSE("GPL v2");