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 <jsa...@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 <jsa...@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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