regulator: gpio-regulator: Allow use of GPIO controlled regulators though DT

Here we provide the GPIO Regulator driver with Device Tree capability, so
that when a platform is booting with DT instead of platform data we can
still make full use of it.

Signed-off-by: Lee Jones <lee.jones@linaro.org>
Reviewed-by: Stephen Warren <swarren@nvidia.com>
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>

diff --git a/Documentation/devicetree/bindings/regulator/gpio-regulator.txt b/Documentation/devicetree/bindings/regulator/gpio-regulator.txt
new file mode 100644 (file)
index 0000000..3703be2
--- /dev/null
+++ b/Documentation/devicetree/bindings/regulator/gpio-regulator.txt
@@ -0,0 +1,36 @@
+GPIO controlled regulators
+
+Required properties:
+- compatible           : Must be "regulator-gpio".
+
+Optional properties:
+- gpio-enable          : GPIO to use to enable/disable the regulator.
+- gpios                        : GPIO group used to control voltage.
+- states               : Selection of available voltages and GPIO configs.
+- startup-delay-us     : Startup time in microseconds.
+- enable-active-high   : Polarity of GPIO is active high (default is low).
+
+Any property defined as part of the core regulator binding defined in
+regulator.txt can also be used.
+
+Example:
+
+       mmciv: gpio-regulator {
+               compatible = "regulator-gpio";
+
+               regulator-name = "mmci-gpio-supply";
+               regulator-min-microvolt = <1800000>;
+               regulator-max-microvolt = <2600000>;
+               regulator-boot-on;
+
+               gpio-enable = <&gpio0 23 0x4>;
+               gpios = <&gpio0 24 0x4
+                        &gpio0 25 0x4>;
+               states = <1800000 0x3
+                         2200000 0x2
+                         2600000 0x1
+                         2900000 0x0>;
+
+               startup-delay-us = <100000>;
+               enable-active-high;
+       };

diff --git a/drivers/regulator/gpio-regulator.c b/drivers/regulator/gpio-regulator.c
index 8b5944f2d7d1ddd36e82e92d786770e469743dfe..e467d0ac87059339fa1658f88d88c3051a73dc84 100644 (file)
--- a/drivers/regulator/gpio-regulator.c
+++ b/drivers/regulator/gpio-regulator.c
@@ -28,9 +28,12 @@
 #include <linux/platform_device.h>
 #include <linux/regulator/driver.h>
 #include <linux/regulator/machine.h>
+#include <linux/regulator/of_regulator.h>
 #include <linux/regulator/gpio-regulator.h>
 #include <linux/gpio.h>
 #include <linux/slab.h>
+#include <linux/of.h>
+#include <linux/of_gpio.h>
 
 struct gpio_regulator_data {
        struct regulator_desc desc;
@@ -129,6 +132,84 @@ static struct regulator_ops gpio_regulator_voltage_ops = {
        .list_voltage = gpio_regulator_list_voltage,
 };
 
+struct gpio_regulator_config *
+of_get_gpio_regulator_config(struct device *dev, struct device_node *np)
+{
+       struct gpio_regulator_config *config;
+       struct property *prop;
+       const char *regtype;
+       int proplen, gpio, i;
+
+       config = devm_kzalloc(dev,
+                       sizeof(struct gpio_regulator_config),
+                       GFP_KERNEL);
+       if (!config)
+               return ERR_PTR(-ENOMEM);
+
+       config->init_data = of_get_regulator_init_data(dev, np);
+       if (!config->init_data)
+               return ERR_PTR(-EINVAL);
+
+       config->supply_name = config->init_data->constraints.name;
+
+       if (of_property_read_bool(np, "enable-active-high"))
+               config->enable_high = true;
+
+       if (of_property_read_bool(np, "enable-at-boot"))
+               config->enabled_at_boot = true;
+
+       of_property_read_u32(np, "startup-delay-us", &config->startup_delay);
+
+       config->enable_gpio = of_get_named_gpio(np, "enable-gpio", 0);
+
+       /* Fetch GPIOs. */
+       for (i = 0; ; i++)
+               if (of_get_named_gpio(np, "gpios", i) < 0)
+                       break;
+       config->nr_gpios = i;
+
+       config->gpios = devm_kzalloc(dev,
+                               sizeof(struct gpio) * config->nr_gpios,
+                               GFP_KERNEL);
+       if (!config->gpios)
+               return ERR_PTR(-ENOMEM);
+
+       for (i = 0; config->nr_gpios; i++) {
+               gpio = of_get_named_gpio(np, "gpios", i);
+               if (gpio < 0)
+                       break;
+               config->gpios[i].gpio = gpio;
+       }
+
+       /* Fetch states. */
+       prop = of_find_property(np, "states", NULL);
+       proplen = prop->length / sizeof(int);
+
+       config->states = devm_kzalloc(dev,
+                               sizeof(struct gpio_regulator_state)
+                               * (proplen / 2),
+                               GFP_KERNEL);
+       if (!config->states)
+               return ERR_PTR(-ENOMEM);
+
+       for (i = 0; i < proplen / 2; i++) {
+               config->states[i].value =
+                       be32_to_cpup((int *)prop->value + (i * 2));
+               config->states[i].gpios =
+                       be32_to_cpup((int *)prop->value + (i * 2 + 1));
+       }
+       config->nr_states = i;
+
+       of_property_read_string(np, "regulator-type", &regtype);
+
+       if (!strncmp("voltage", regtype, 7))
+               config->type = REGULATOR_VOLTAGE;
+       else if (!strncmp("current", regtype, 7))
+               config->type = REGULATOR_CURRENT;
+
+       return config;
+}
+
 static struct regulator_ops gpio_regulator_current_ops = {
        .get_current_limit = gpio_regulator_get_value,
        .set_current_limit = gpio_regulator_set_current_limit,
@@ -137,10 +218,17 @@ static struct regulator_ops gpio_regulator_current_ops = {
 static int __devinit gpio_regulator_probe(struct platform_device *pdev)
 {
        struct gpio_regulator_config *config = pdev->dev.platform_data;
+       struct device_node *np = pdev->dev.of_node;
        struct gpio_regulator_data *drvdata;
        struct regulator_config cfg = { };
        int ptr, ret, state;
 
+       if (np) {
+               config = of_get_gpio_regulator_config(&pdev->dev, np);
+               if (IS_ERR(config))
+                       return PTR_ERR(config);
+       }
+
        drvdata = devm_kzalloc(&pdev->dev, sizeof(struct gpio_regulator_data),
                               GFP_KERNEL);
        if (drvdata == NULL) {
@@ -270,12 +358,18 @@ static int __devexit gpio_regulator_remove(struct platform_device *pdev)
        return 0;
 }
 
+static const struct of_device_id regulator_gpio_of_match[] __devinitconst = {
+       { .compatible = "regulator-gpio", },
+       {},
+};
+
 static struct platform_driver gpio_regulator_driver = {
        .probe          = gpio_regulator_probe,
        .remove         = __devexit_p(gpio_regulator_remove),
        .driver         = {
                .name           = "gpio-regulator",
                .owner          = THIS_MODULE,
+               .of_match_table = regulator_gpio_of_match,
        },
 };