2  * Copyright (C) 2013 - 2014 Texas Instruments Incorporated - http://www.ti.com
12  * Gpio controlled clock implementation
15 #include <linux/clk-provider.h>
25  * DOC: basic gpio gated clock which can be enabled and disabled
27  * Traits of this clock:
28  * prepare - clk_(un)prepare only ensures parent is (un)prepared
29  * enable - clk_enable and clk_disable are functional & control gpio
30  * rate - inherits rate from parent.  No clk_set_rate support
31  * parent - fixed parent.  No clk_set_parent support
38 	gpiod_set_value(clk->gpiod, 1);  in clk_gpio_gate_enable()
47 	gpiod_set_value(clk->gpiod, 0);  in clk_gpio_gate_disable()
54 	return gpiod_get_value(clk->gpiod);  in clk_gpio_gate_is_enabled()
65  * DOC: basic clock multiplexer which can be controlled with a gpio output
66  * Traits of this clock:
67  * prepare - clk_prepare only ensures that parents are prepared
68  * rate - rate is only affected by parent switching.  No clk_set_rate support
69  * parent - parent is adjustable through clk_set_parent
76 	return gpiod_get_value_cansleep(clk->gpiod);  in clk_gpio_mux_get_parent()
83 	gpiod_set_value_cansleep(clk->gpiod, index);  in clk_gpio_mux_set_parent()
95 static struct clk_hw *clk_register_gpio(struct device *dev, const char *name,  in clk_register_gpio()  argument
110 		return ERR_PTR(-ENOMEM);  in clk_register_gpio()
112 	init.name = name;  in clk_register_gpio()
118 	clk_gpio->gpiod = gpiod;  in clk_register_gpio()
119 	clk_gpio->hw.init = &init;  in clk_register_gpio()
121 	hw = &clk_gpio->hw;  in clk_register_gpio()
138  * clk_hw_register_gpio_gate - register a gpio clock gate with the clock
140  * @dev: device that is registering this clock
141  * @name: name of this clock
142  * @parent_name: name of this clock's parent
143  * @gpiod: gpio descriptor to gate this clock
144  * @flags: clock flags
146 struct clk_hw *clk_hw_register_gpio_gate(struct device *dev, const char *name,  in clk_hw_register_gpio_gate()  argument
150 	return clk_register_gpio(dev, name,  in clk_hw_register_gpio_gate()
157 struct clk *clk_register_gpio_gate(struct device *dev, const char *name,  in clk_register_gpio_gate()  argument
163 	hw = clk_hw_register_gpio_gate(dev, name, parent_name, gpiod, flags);  in clk_register_gpio_gate()
166 	return hw->clk;  in clk_register_gpio_gate()
171  * clk_hw_register_gpio_mux - register a gpio clock mux with the clock framework
172  * @dev: device that is registering this clock
173  * @name: name of this clock
174  * @parent_names: names of this clock's parents
176  * @gpiod: gpio descriptor to gate this clock
177  * @flags: clock flags
179 struct clk_hw *clk_hw_register_gpio_mux(struct device *dev, const char *name,  in clk_hw_register_gpio_mux()  argument
184 		pr_err("mux-clock %s must have 2 parents\n", name);  in clk_hw_register_gpio_mux()
185 		return ERR_PTR(-EINVAL);  in clk_hw_register_gpio_mux()
188 	return clk_register_gpio(dev, name, parent_names, num_parents,  in clk_hw_register_gpio_mux()
193 struct clk *clk_register_gpio_mux(struct device *dev, const char *name,  in clk_register_gpio_mux()  argument
199 	hw = clk_hw_register_gpio_mux(dev, name, parent_names, num_parents,  in clk_register_gpio_mux()
203 	return hw->clk;  in clk_register_gpio_mux()
209 	struct device_node *node = pdev->dev.of_node;  in gpio_clk_driver_probe()
219 		parent_names = devm_kcalloc(&pdev->dev, num_parents,  in gpio_clk_driver_probe()
222 			return -ENOMEM;  in gpio_clk_driver_probe()
229 	is_mux = of_device_is_compatible(node, "gpio-mux-clock");  in gpio_clk_driver_probe()
232 	gpiod = devm_gpiod_get(&pdev->dev, gpio_name, GPIOD_OUT_LOW);  in gpio_clk_driver_probe()
235 		if (ret == -EPROBE_DEFER)  in gpio_clk_driver_probe()
237 					node->name, __func__);  in gpio_clk_driver_probe()
240 					node->name, __func__,  in gpio_clk_driver_probe()
246 		clk = clk_register_gpio_mux(&pdev->dev, node->name,  in gpio_clk_driver_probe()
249 		clk = clk_register_gpio_gate(&pdev->dev, node->name,  in gpio_clk_driver_probe()
259 	{ .compatible = "gpio-mux-clock" },
260 	{ .compatible = "gpio-gate-clock" },
267 		.name	= "gpio-clk",