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path: root/kernel/drivers/clk/clk-gpio-gate.c
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Diffstat (limited to 'kernel/drivers/clk/clk-gpio-gate.c')
-rw-r--r--kernel/drivers/clk/clk-gpio-gate.c208
1 files changed, 0 insertions, 208 deletions
diff --git a/kernel/drivers/clk/clk-gpio-gate.c b/kernel/drivers/clk/clk-gpio-gate.c
deleted file mode 100644
index a71cabedd..000000000
--- a/kernel/drivers/clk/clk-gpio-gate.c
+++ /dev/null
@@ -1,208 +0,0 @@
-/*
- * Copyright (C) 2013 - 2014 Texas Instruments Incorporated - http://www.ti.com
- * Author: Jyri Sarha <jsarha@ti.com>
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License version 2 as
- * published by the Free Software Foundation.
- *
- * Gpio gated clock implementation
- */
-
-#include <linux/clk-provider.h>
-#include <linux/module.h>
-#include <linux/slab.h>
-#include <linux/gpio.h>
-#include <linux/gpio/consumer.h>
-#include <linux/of_gpio.h>
-#include <linux/err.h>
-#include <linux/device.h>
-
-/**
- * DOC: basic gpio gated clock which can be enabled and disabled
- * with gpio output
- * Traits of this clock:
- * prepare - clk_(un)prepare only ensures parent is (un)prepared
- * enable - clk_enable and clk_disable are functional & control gpio
- * rate - inherits rate from parent. No clk_set_rate support
- * parent - fixed parent. No clk_set_parent support
- */
-
-#define to_clk_gpio(_hw) container_of(_hw, struct clk_gpio, hw)
-
-static int clk_gpio_gate_enable(struct clk_hw *hw)
-{
- struct clk_gpio *clk = to_clk_gpio(hw);
-
- gpiod_set_value(clk->gpiod, 1);
-
- return 0;
-}
-
-static void clk_gpio_gate_disable(struct clk_hw *hw)
-{
- struct clk_gpio *clk = to_clk_gpio(hw);
-
- gpiod_set_value(clk->gpiod, 0);
-}
-
-static int clk_gpio_gate_is_enabled(struct clk_hw *hw)
-{
- struct clk_gpio *clk = to_clk_gpio(hw);
-
- return gpiod_get_value(clk->gpiod);
-}
-
-const struct clk_ops clk_gpio_gate_ops = {
- .enable = clk_gpio_gate_enable,
- .disable = clk_gpio_gate_disable,
- .is_enabled = clk_gpio_gate_is_enabled,
-};
-EXPORT_SYMBOL_GPL(clk_gpio_gate_ops);
-
-/**
- * clk_register_gpio - register a gpip clock with the clock framework
- * @dev: device that is registering this clock
- * @name: name of this clock
- * @parent_name: name of this clock's parent
- * @gpio: gpio number to gate this clock
- * @active_low: true if gpio should be set to 0 to enable clock
- * @flags: clock flags
- */
-struct clk *clk_register_gpio_gate(struct device *dev, const char *name,
- const char *parent_name, unsigned gpio, bool active_low,
- unsigned long flags)
-{
- struct clk_gpio *clk_gpio = NULL;
- struct clk *clk = ERR_PTR(-EINVAL);
- struct clk_init_data init = { NULL };
- unsigned long gpio_flags;
- int err;
-
- if (active_low)
- gpio_flags = GPIOF_ACTIVE_LOW | GPIOF_OUT_INIT_HIGH;
- else
- gpio_flags = GPIOF_OUT_INIT_LOW;
-
- if (dev)
- err = devm_gpio_request_one(dev, gpio, gpio_flags, name);
- else
- err = gpio_request_one(gpio, gpio_flags, name);
-
- if (err) {
- pr_err("%s: %s: Error requesting clock control gpio %u\n",
- __func__, name, gpio);
- return ERR_PTR(err);
- }
-
- if (dev)
- clk_gpio = devm_kzalloc(dev, sizeof(struct clk_gpio),
- GFP_KERNEL);
- else
- clk_gpio = kzalloc(sizeof(struct clk_gpio), GFP_KERNEL);
-
- if (!clk_gpio) {
- clk = ERR_PTR(-ENOMEM);
- goto clk_register_gpio_gate_err;
- }
-
- init.name = name;
- init.ops = &clk_gpio_gate_ops;
- init.flags = flags | CLK_IS_BASIC;
- init.parent_names = (parent_name ? &parent_name : NULL);
- init.num_parents = (parent_name ? 1 : 0);
-
- clk_gpio->gpiod = gpio_to_desc(gpio);
- clk_gpio->hw.init = &init;
-
- clk = clk_register(dev, &clk_gpio->hw);
-
- if (!IS_ERR(clk))
- return clk;
-
- if (!dev)
- kfree(clk_gpio);
-
-clk_register_gpio_gate_err:
- if (!dev)
- gpio_free(gpio);
-
- return clk;
-}
-EXPORT_SYMBOL_GPL(clk_register_gpio_gate);
-
-#ifdef CONFIG_OF
-/**
- * The clk_register_gpio_gate has to be delayed, because the EPROBE_DEFER
- * can not be handled properly at of_clk_init() call time.
- */
-
-struct clk_gpio_gate_delayed_register_data {
- struct device_node *node;
- struct mutex lock;
- struct clk *clk;
-};
-
-static struct clk *of_clk_gpio_gate_delayed_register_get(
- struct of_phandle_args *clkspec,
- void *_data)
-{
- struct clk_gpio_gate_delayed_register_data *data = _data;
- struct clk *clk;
- const char *clk_name = data->node->name;
- const char *parent_name;
- int gpio;
- enum of_gpio_flags of_flags;
-
- mutex_lock(&data->lock);
-
- if (data->clk) {
- mutex_unlock(&data->lock);
- return data->clk;
- }
-
- gpio = of_get_named_gpio_flags(data->node, "enable-gpios", 0,
- &of_flags);
- if (gpio < 0) {
- mutex_unlock(&data->lock);
- if (gpio != -EPROBE_DEFER)
- pr_err("%s: %s: Can't get 'enable-gpios' DT property\n",
- __func__, clk_name);
- return ERR_PTR(gpio);
- }
-
- parent_name = of_clk_get_parent_name(data->node, 0);
-
- clk = clk_register_gpio_gate(NULL, clk_name, parent_name, gpio,
- of_flags & OF_GPIO_ACTIVE_LOW, 0);
- if (IS_ERR(clk)) {
- mutex_unlock(&data->lock);
- return clk;
- }
-
- data->clk = clk;
- mutex_unlock(&data->lock);
-
- return clk;
-}
-
-/**
- * of_gpio_gate_clk_setup() - Setup function for gpio controlled clock
- */
-void __init of_gpio_gate_clk_setup(struct device_node *node)
-{
- struct clk_gpio_gate_delayed_register_data *data;
-
- data = kzalloc(sizeof(struct clk_gpio_gate_delayed_register_data),
- GFP_KERNEL);
- if (!data)
- return;
-
- data->node = node;
- mutex_init(&data->lock);
-
- of_clk_add_provider(node, of_clk_gpio_gate_delayed_register_get, data);
-}
-EXPORT_SYMBOL_GPL(of_gpio_gate_clk_setup);
-CLK_OF_DECLARE(gpio_gate_clk, "gpio-gate-clock", of_gpio_gate_clk_setup);
-#endif