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>
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@ -0,0 +1,29 @@
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Fixed Voltage regulators
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Required properties:
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- compatible: Must be "regulator-fixed";
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Optional properties:
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- gpio: gpio to use for enable control
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- startup-delay-us: startup time in microseconds
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- enable-active-high: Polarity of GPIO is Active high
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If this property is missing, the default assumed is Active low.
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Any property defined as part of the core regulator
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binding, defined in regulator.txt, can also be used.
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However a fixed voltage regulator is expected to have the
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regulator-min-microvolt and regulator-max-microvolt
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to be the same.
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Example:
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abc: fixedregulator@0 {
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compatible = "regulator-fixed";
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regulator-name = "fixed-supply";
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regulator-min-microvolt = <1800000>;
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regulator-max-microvolt = <1800000>;
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gpio = <&gpio1 16 0>;
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startup-delay-us = <70000>;
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enable-active-high;
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regulator-boot-on
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};
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@ -27,6 +27,10 @@
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#include <linux/gpio.h>
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#include <linux/delay.h>
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#include <linux/slab.h>
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#include <linux/of.h>
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#include <linux/of_gpio.h>
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#include <linux/regulator/of_regulator.h>
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#include <linux/regulator/machine.h>
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struct fixed_voltage_data {
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struct regulator_desc desc;
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@ -38,6 +42,53 @@ struct fixed_voltage_data {
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bool is_enabled;
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};
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/**
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* of_get_fixed_voltage_config - extract fixed_voltage_config structure info
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* @dev: device requesting for fixed_voltage_config
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*
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* Populates fixed_voltage_config structure by extracting data from device
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* tree node, returns a pointer to the populated structure of NULL if memory
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* alloc fails.
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*/
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struct fixed_voltage_config *of_get_fixed_voltage_config(struct device *dev)
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{
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struct fixed_voltage_config *config;
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struct device_node *np = dev->of_node;
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const __be32 *delay;
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struct regulator_init_data *init_data;
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config = devm_kzalloc(dev, sizeof(struct fixed_voltage_config),
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GFP_KERNEL);
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if (!config)
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return NULL;
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config->init_data = of_get_regulator_init_data(dev);
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init_data = config->init_data;
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config->supply_name = init_data->constraints.name;
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if (init_data->constraints.min_uV == init_data->constraints.max_uV) {
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config->microvolts = init_data->constraints.min_uV;
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} else {
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dev_err(dev,
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"Fixed regulator specified with variable voltages\n");
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return NULL;
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}
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if (init_data->constraints.boot_on)
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config->enabled_at_boot = true;
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config->gpio = of_get_named_gpio(np, "gpio", 0);
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delay = of_get_property(np, "startup-delay-us", NULL);
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if (delay)
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config->startup_delay = be32_to_cpu(*delay);
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if (of_find_property(np, "enable-active-high", NULL))
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config->enable_high = true;
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return config;
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}
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static int fixed_voltage_is_enabled(struct regulator_dev *dev)
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{
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struct fixed_voltage_data *data = rdev_get_drvdata(dev);
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@ -109,6 +160,9 @@ static int __devinit reg_fixed_voltage_probe(struct platform_device *pdev)
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struct fixed_voltage_data *drvdata;
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int ret;
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if (pdev->dev.of_node)
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config = of_get_fixed_voltage_config(&pdev->dev);
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drvdata = kzalloc(sizeof(struct fixed_voltage_data), GFP_KERNEL);
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if (drvdata == NULL) {
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dev_err(&pdev->dev, "Failed to allocate device data\n");
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@ -217,12 +271,23 @@ static int __devexit reg_fixed_voltage_remove(struct platform_device *pdev)
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return 0;
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}
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#if defined(CONFIG_OF)
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static const struct of_device_id fixed_of_match[] __devinitconst = {
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{ .compatible = "regulator-fixed", },
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{},
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};
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MODULE_DEVICE_TABLE(of, fixed_of_match);
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#else
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#define fixed_of_match NULL
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#endif
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static struct platform_driver regulator_fixed_voltage_driver = {
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.probe = reg_fixed_voltage_probe,
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.remove = __devexit_p(reg_fixed_voltage_remove),
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.driver = {
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.name = "reg-fixed-voltage",
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.owner = THIS_MODULE,
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.of_match_table = fixed_of_match,
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},
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};
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