regulator: adapt fixed regulator driver to dt

The fixed regulator driver uses of_get_fixed_voltage_config()
to extract fixed_voltage_config structure contents from device tree.

Also add documenation for additional bindings for fixed
regulators that can be passed through dt.

Signed-off-by: Rajendra Nayak <rnayak@ti.com>
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>

1 files changed, 65 insertions, 0 deletions

diff --git a/drivers/regulator/fixed.c b/drivers/regulator/fixed.c
index 21ecf212a522..0650856b93cb 100644
--- a/drivers/regulator/fixed.c
+++ b/drivers/regulator/fixed.c
@@ -27,6 +27,10 @@
 #include <linux/gpio.h>
 #include <linux/delay.h>
 #include <linux/slab.h>
+#include <linux/of.h>
+#include <linux/of_gpio.h>
+#include <linux/regulator/of_regulator.h>
+#include <linux/regulator/machine.h>
 
 struct fixed_voltage_data {
         struct regulator_desc desc;
@@ -38,6 +42,53 @@ struct fixed_voltage_data {
         bool is_enabled;
 };
 
+
+/**
+ * of_get_fixed_voltage_config - extract fixed_voltage_config structure info
+ * @dev: device requesting for fixed_voltage_config
+ *
+ * Populates fixed_voltage_config structure by extracting data from device
+ * tree node, returns a pointer to the populated structure of NULL if memory
+ * alloc fails.
+ */
+struct fixed_voltage_config *of_get_fixed_voltage_config(struct device *dev)
+{
+        struct fixed_voltage_config *config;
+        struct device_node *np = dev->of_node;
+        const __be32 *delay;
+        struct regulator_init_data *init_data;
+
+        config = devm_kzalloc(dev, sizeof(struct fixed_voltage_config),
+                                                                 GFP_KERNEL);
+        if (!config)
+                return NULL;
+
+        config->init_data = of_get_regulator_init_data(dev);
+        init_data = config->init_data;
+
+        config->supply_name = init_data->constraints.name;
+        if (init_data->constraints.min_uV == init_data->constraints.max_uV) {
+                config->microvolts = init_data->constraints.min_uV;
+        } else {
+                dev_err(dev,
+                         "Fixed regulator specified with variable voltages\n");
+                return NULL;
+        }
+
+        if (init_data->constraints.boot_on)
+                config->enabled_at_boot = true;
+
+        config->gpio = of_get_named_gpio(np, "gpio", 0);
+        delay = of_get_property(np, "startup-delay-us", NULL);
+        if (delay)
+                config->startup_delay = be32_to_cpu(*delay);
+
+        if (of_find_property(np, "enable-active-high", NULL))
+                config->enable_high = true;
+
+        return config;
+}
+
 static int fixed_voltage_is_enabled(struct regulator_dev *dev)
 {
         struct fixed_voltage_data *data = rdev_get_drvdata(dev);
@@ -109,6 +160,9 @@ static int __devinit reg_fixed_voltage_probe(struct platform_device *pdev)
         struct fixed_voltage_data *drvdata;
         int ret;
 
+        if (pdev->dev.of_node)
+                config = of_get_fixed_voltage_config(&pdev->dev);
+
         drvdata = kzalloc(sizeof(struct fixed_voltage_data), GFP_KERNEL);
         if (drvdata == NULL) {
                 dev_err(&pdev->dev, "Failed to allocate device data\n");
@@ -217,12 +271,23 @@ static int __devexit reg_fixed_voltage_remove(struct platform_device *pdev)
         return 0;
 }
 
+#if defined(CONFIG_OF)
+static const struct of_device_id fixed_of_match[] __devinitconst = {
+        { .compatible = "regulator-fixed", },
+        {},
+};
+MODULE_DEVICE_TABLE(of, fixed_of_match);
+#else
+#define fixed_of_match NULL
+#endif
+
 static struct platform_driver regulator_fixed_voltage_driver = {
         .probe          = reg_fixed_voltage_probe,
         .remove         = __devexit_p(reg_fixed_voltage_remove),
         .driver         = {
                 .name           = "reg-fixed-voltage",
                 .owner          = THIS_MODULE,
+                .of_match_table = fixed_of_match,
         },
 };