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Date: Thu, 27 Oct 2011 13:26:23 +0530
From: Rajendra Nayak <rnayak@...com>
To: <broonie@...nsource.wolfsonmicro.com>, <grant.likely@...retlab.ca>
CC: <devicetree-discuss@...ts.ozlabs.org>,
<linux-omap@...r.kernel.org>,
<linux-arm-kernel@...ts.infradead.org>, <tony@...mide.com>,
<lrg@...com>, <b-cousson@...com>, <patches@...aro.org>,
<linux-kernel@...r.kernel.org>, <shawn.guo@...escale.com>,
Rajendra Nayak <rnayak@...com>
Subject: [PATCH v3 2/4] 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@...com>
---
.../bindings/regulator/fixed-regulator.txt | 25 +++++++++
drivers/regulator/fixed.c | 57 ++++++++++++++++++++
2 files changed, 82 insertions(+), 0 deletions(-)
create mode 100644 Documentation/devicetree/bindings/regulator/fixed-regulator.txt
diff --git a/Documentation/devicetree/bindings/regulator/fixed-regulator.txt b/Documentation/devicetree/bindings/regulator/fixed-regulator.txt
new file mode 100644
index 0000000..049df3d
--- /dev/null
+++ b/Documentation/devicetree/bindings/regulator/fixed-regulator.txt
@@ -0,0 +1,25 @@
+Fixed Voltage regulators
+
+Required properties:
+- compatible: Must be "regulator-fixed";
+
+Optional properties:
+- regulator-fixed-supply: Name of the regulator supply
+- regulator-fixed-microvolts: Output voltage of regulator
+- regulator-fixed-gpio: gpio to use for enable control
+- regulator-fixed-startup-delay: startup time in microseconds
+- regulator-fixed-enable-high: Polarity of enable GPIO,
+ 1 = Active High, 0 = Active low
+- regulator-fixed-enabled-at-boot: 1 = yes, 0 = no
+
+Example:
+
+ abc: fixedregulator@0 {
+ compatible = "regulator-fixed";
+ regulator-fixed-supply = "fixed-supply";
+ regulator-fixed-microvolts = <1800000>;
+ regulator-fixed-gpio = <43>;
+ regulator-fixed-startup-delay = <70000>;
+ regulator-fixed-enable-high;
+ regulator-fixed-enabled-at-boot;
+ };
diff --git a/drivers/regulator/fixed.c b/drivers/regulator/fixed.c
index 2fe9d99..9851b42 100644
--- a/drivers/regulator/fixed.c
+++ b/drivers/regulator/fixed.c
@@ -26,6 +26,9 @@
#include <linux/gpio.h>
#include <linux/delay.h>
#include <linux/slab.h>
+#include <linux/of.h>
+#include <linux/regulator/of_regulator.h>
+#include <linux/regulator/machine.h>
struct fixed_voltage_data {
struct regulator_desc desc;
@@ -37,6 +40,46 @@ 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 *microvolts, *gpio, *delay;
+
+ config = devm_kzalloc(dev, sizeof(struct fixed_voltage_config), GFP_KERNEL);
+ if (!config)
+ return NULL;
+
+ config->supply_name = of_get_property(np, "regulator-fixed-supply", NULL);
+ microvolts = of_get_property(np, "regulator-fixed-microvolts", NULL);
+ if (microvolts)
+ config->microvolts = be32_to_cpu(*microvolts);
+ gpio = of_get_property(np, "regulator-fixed-gpio", NULL);
+ if (gpio)
+ config->gpio = be32_to_cpu(*gpio);
+ delay = of_get_property(np, "regulator-fixed-startup-delay", NULL);
+ if (delay)
+ config->startup_delay = be32_to_cpu(*delay);
+
+ if (of_find_property(np, "regulator-fixed-enable-high", NULL))
+ config->enable_high = true;
+ if (of_find_property(np, "regulator-fixed-enabled-at-boot", NULL))
+ config->enabled_at_boot = true;
+
+ config->init_data = of_get_regulator_init_data(dev);
+
+ return config;
+}
+
static int fixed_voltage_is_enabled(struct regulator_dev *dev)
{
struct fixed_voltage_data *data = rdev_get_drvdata(dev);
@@ -108,6 +151,9 @@ 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");
@@ -216,12 +262,23 @@ 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,
},
};
--
1.7.1
--
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