drivers/clk/clk-gpio.c

1 // SPDX-License-Identifier: GPL-2.0
3  * Copyright (C) 2013 - 2014 Texas Instruments Incorporated - https://www.ti.com
7  *    Sergej Sawazki <ce3a@gmx.de>
12 #include <linux/clk-provider.h>
25  * prepare - clk_(un)prepare only ensures parent is (un)prepared
26  * enable - clk_enable and clk_disable are functional & control gpio
27  * rate - inherits rate from parent.  No clk_set_rate support
28  * parent - fixed parent.  No clk_set_parent support
32  * struct clk_gpio - gpio gated clock
34  * @hw:		handle between common and hardware-specific interfaces
38  * or switching between two parents by asserting or deasserting the gpio.
55 	gpiod_set_value(clk->gpiod, 1);  in clk_gpio_gate_enable()
64 	gpiod_set_value(clk->gpiod, 0);  in clk_gpio_gate_disable()
71 	return gpiod_get_value(clk->gpiod);  in clk_gpio_gate_is_enabled()
84 	gpiod_set_value_cansleep(clk->gpiod, 1);  in clk_sleeping_gpio_gate_prepare()
93 	gpiod_set_value_cansleep(clk->gpiod, 0);  in clk_sleeping_gpio_gate_unprepare()
100 	return gpiod_get_value_cansleep(clk->gpiod);  in clk_sleeping_gpio_gate_is_prepared()
112  * prepare - clk_prepare only ensures that parents are prepared
113  * rate - rate is only affected by parent switching.  No clk_set_rate support
114  * parent - parent is adjustable through clk_set_parent
121 	return gpiod_get_value_cansleep(clk->gpiod);  in clk_gpio_mux_get_parent()
128 	gpiod_set_value_cansleep(clk->gpiod, index);  in clk_gpio_mux_set_parent()
154 		return ERR_PTR(-ENOMEM);  in clk_register_gpio()
156 	init.name = dev->of_node->name;  in clk_register_gpio()
162 	clk_gpio->gpiod = gpiod;  in clk_register_gpio()
163 	clk_gpio->hw.init = &init;  in clk_register_gpio()
165 	hw = &clk_gpio->hw;  in clk_register_gpio()
195 	struct device *dev = &pdev->dev;  in gpio_clk_driver_probe()
196 	struct device_node *node = dev->of_node;  in gpio_clk_driver_probe()
204 	is_mux = of_device_is_compatible(node, "gpio-mux-clock");  in gpio_clk_driver_probe()
208 		dev_err(dev, "mux-clock must have 2 parents\n");  in gpio_clk_driver_probe()
209 		return -EINVAL;  in gpio_clk_driver_probe()
216 		if (ret == -EPROBE_DEFER)  in gpio_clk_driver_probe()
237 	{ .compatible = "gpio-mux-clock" },
238 	{ .compatible = "gpio-gate-clock" },
245 		.name	= "gpio-clk",