[alsa-devel] [PATCH v2 1/8] clk: ti: add gpio controlled clock
Jyri Sarha
jsarha at ti.com
Mon Aug 18 23:46:39 CEST 2014
The added ti,gpio-clock is a basic clock that can be enabled and
disabled trough a gpio output. The DT binding document for the clock
is also added. For EPROBE_DEFER handling the registering of the clock
has to be delayed until of_clk_get() call time.
Signed-off-by: Jyri Sarha <jsarha at ti.com>
---
.../devicetree/bindings/clock/ti/gpio-clock.txt | 21 ++
drivers/clk/ti/Makefile | 2 +-
drivers/clk/ti/gpio.c | 202 ++++++++++++++++++++
3 files changed, 224 insertions(+), 1 deletion(-)
create mode 100644 Documentation/devicetree/bindings/clock/ti/gpio-clock.txt
create mode 100644 drivers/clk/ti/gpio.c
diff --git a/Documentation/devicetree/bindings/clock/ti/gpio-clock.txt b/Documentation/devicetree/bindings/clock/ti/gpio-clock.txt
new file mode 100644
index 0000000..2eb854d
--- /dev/null
+++ b/Documentation/devicetree/bindings/clock/ti/gpio-clock.txt
@@ -0,0 +1,21 @@
+Binding for simple gpio controlled clock.
+
+This binding uses the common clock binding[1].
+
+[1] Documentation/devicetree/bindings/clock/clock-bindings.txt
+
+Required properties:
+- compatible : shall be "ti,gpio-clock".
+- #clock-cells : from common clock binding; shall be set to 0.
+- enable-gpios : GPIO reference for enabling and disabling the clock.
+
+Optional properties:
+- clocks: Maximum of one parent clock is supported.
+
+Example:
+ clock {
+ compatible = "ti,gpio-clock";
+ clocks = <&parentclk>;
+ #clock-cells = <0>;
+ enable-gpios = <&gpio 1 GPIO_ACTIVE_HIGH>;
+ };
diff --git a/drivers/clk/ti/Makefile b/drivers/clk/ti/Makefile
index ed4d0aa..88074d3 100644
--- a/drivers/clk/ti/Makefile
+++ b/drivers/clk/ti/Makefile
@@ -1,7 +1,7 @@
ifneq ($(CONFIG_OF),)
obj-y += clk.o autoidle.o clockdomain.o
clk-common = dpll.o composite.o divider.o gate.o \
- fixed-factor.o mux.o apll.o
+ fixed-factor.o mux.o apll.o gpio.o
obj-$(CONFIG_SOC_AM33XX) += $(clk-common) clk-33xx.o
obj-$(CONFIG_ARCH_OMAP2) += $(clk-common) interface.o clk-2xxx.o
obj-$(CONFIG_ARCH_OMAP3) += $(clk-common) interface.o clk-3xxx.o
diff --git a/drivers/clk/ti/gpio.c b/drivers/clk/ti/gpio.c
new file mode 100644
index 0000000..f4c668e
--- /dev/null
+++ b/drivers/clk/ti/gpio.c
@@ -0,0 +1,202 @@
+/*
+ * Copyright (C) 2012 - 2014 Texas Instruments Incorporated - http://www.ti.com
+ * Author: Jyri Sarha <jsarha at 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 controlled clock implementation
+ */
+
+#include <linux/clk-provider.h>
+#include <linux/module.h>
+#include <linux/slab.h>
+#include <linux/gpio.h>
+#include <linux/of_gpio.h>
+#include <linux/err.h>
+#include <linux/device.h>
+
+struct clk_gpio {
+ struct clk_hw hw;
+ struct gpio_desc *gpiod;
+};
+
+/**
+ * DOC: basic gpio controlled 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_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_disable(struct clk_hw *hw)
+{
+ struct clk_gpio *clk = to_clk_gpio(hw);
+
+ gpiod_set_value(clk->gpiod, 0);
+}
+
+static int clk_gpio_is_enabled(struct clk_hw *hw)
+{
+ struct clk_gpio *clk = to_clk_gpio(hw);
+
+ return gpiod_get_value(clk->gpiod);
+}
+
+static const struct clk_ops clk_gpio_ops = {
+ .enable = clk_gpio_enable,
+ .disable = clk_gpio_disable,
+ .is_enabled = clk_gpio_is_enabled,
+};
+
+/**
+ * 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
+ * @gpiod: gpio descriptor to control this clock
+ */
+static struct clk *clk_register_gpio(struct device *dev, const char *name,
+ const char *parent_name, struct gpio_desc *gpiod,
+ 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 (gpiod_is_active_low(gpiod))
+ gpio_flags = GPIOF_OUT_INIT_HIGH;
+ else
+ gpio_flags = GPIOF_OUT_INIT_LOW;
+
+ if (dev)
+ err = devm_gpio_request_one(dev, desc_to_gpio(gpiod),
+ gpio_flags, name);
+ else
+ err = gpio_request_one(desc_to_gpio(gpiod), gpio_flags, name);
+
+ if (err) {
+ pr_err("%s: %s: Error requesting clock control gpio %u\n",
+ __func__, name, desc_to_gpio(gpiod));
+ 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)
+ goto clk_register_gpio_err;
+
+ init.name = name;
+ init.ops = &clk_gpio_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 = gpiod;
+ 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_err:
+ gpiod_put(gpiod);
+
+ return clk;
+}
+
+/**
+ * The clk_register_gpio has to be delayed, because the EPROBE_DEFER
+ * can not be handled properly at of_clk_init() call time.
+ */
+
+struct clk_gpio_delayed_register_data {
+ struct device_node *node;
+ struct mutex lock;
+ struct clk *clk;
+};
+
+static
+struct clk *of_clk_gpio_delayed_register_get(struct of_phandle_args *clkspec,
+ void *_data)
+{
+ struct clk_gpio_delayed_register_data *data = _data;
+ struct clk *clk;
+ const char *clk_name = data->node->name;
+ const char *parent_name;
+ struct gpio_desc *gpiod;
+ int gpio;
+
+ 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, NULL);
+ 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);
+ }
+ gpiod = gpio_to_desc(gpio);
+
+ parent_name = of_clk_get_parent_name(data->node, 0);
+
+ clk = clk_register_gpio(NULL, clk_name, parent_name, gpiod, 0);
+ if (IS_ERR(clk)) {
+ mutex_unlock(&data->lock);
+ return clk;
+ }
+
+ data->clk = clk;
+ mutex_unlock(&data->lock);
+
+ return clk;
+}
+
+/**
+ * of_gpio_clk_setup() - Setup function for gpio controlled clock
+ */
+static void __init of_gpio_clk_setup(struct device_node *node)
+{
+ struct clk_gpio_delayed_register_data *data;
+
+ data = kzalloc(sizeof(struct clk_gpio_delayed_register_data),
+ GFP_KERNEL);
+ if (!data)
+ return;
+
+ data->node = node;
+ mutex_init(&data->lock);
+
+ of_clk_add_provider(node, of_clk_gpio_delayed_register_get, data);
+}
+CLK_OF_DECLARE(gpio_clk, "ti,gpio-clock", of_gpio_clk_setup);
--
1.7.9.5
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