Several regulator drivers are using an enable GPIO with similar DT
properties, yet each driver is parsing these properties its own way. Add
the of_get_regulator_gpio_config() function which is able to parse all
known properties and update the regulator_config accordingly.
Signed-off-by: Alexandre Courbot <acour...@nvidia.com>
---
drivers/regulator/of_regulator.c | 52 ++++++++++++++++++++++++++++++++++
include/linux/regulator/of_regulator.h | 14 +++++++++
2 files changed, 66 insertions(+)
diff --git a/drivers/regulator/of_regulator.c b/drivers/regulator/of_regulator.c
index cd828dbf9d52..f1cff511320b 100644
--- a/drivers/regulator/of_regulator.c
+++ b/drivers/regulator/of_regulator.c
@@ -13,6 +13,7 @@
#include <linux/module.h>
#include <linux/slab.h>
#include <linux/of.h>
+#include <linux/of_gpio.h>
#include <linux/regulator/machine.h>
#include <linux/regulator/driver.h>
#include <linux/regulator/of_regulator.h>
@@ -350,3 +351,54 @@ struct regulator_init_data
*regulator_of_get_init_data(struct device *dev,
return init_data;
}
+
+int of_get_regulator_gpio_config(struct device *dev, struct device_node *np,
+ const char *prop,
+ struct regulator_config *cfg)
+{
+ enum of_gpio_flags flags;
+ bool active_high;
+ int ena_gpio;
+
+ /* Do we have an enable GPIO property? */
+ ena_gpio = of_get_named_gpio_flags(np, prop, 0, &flags);
+ if (!gpio_is_valid(ena_gpio)) {
+ /* No enable GPIO defined, nothing to do */
+ if (ena_gpio == -ENOENT)
+ return 0;
+
+ if (ena_gpio != -EPROBE_DEFER)
+ dev_err(dev, "error getting enable GPIO: %d\n",
+ ena_gpio);
+ return ena_gpio;
+ }
+
+ cfg->ena_gpio_initialized = true;
+ cfg->ena_gpio = ena_gpio;
+
+ /* Is GPIO active-low? */
+ active_high = of_property_read_bool(np, "enable-active-high");
+ cfg->ena_gpio_invert = of_property_read_bool(np, "enable-active-high") ?
+ false : !!(flags & OF_GPIO_ACTIVE_LOW);
+
+ /* Should GPIO be set? */
+ if (of_property_read_bool(np, "regulator-boot-on") ||
+ of_property_read_bool(np, "regulator-always-on") ||
+ of_property_read_bool(np, "enable-at-boot")) {
+ if (cfg->ena_gpio_invert)
+ cfg->ena_gpio_flags |= GPIOF_OUT_INIT_LOW;
+ else
+ cfg->ena_gpio_flags |= GPIOF_OUT_INIT_HIGH;
+ } else {
+ if (cfg->ena_gpio_invert)
+ cfg->ena_gpio_flags |= GPIOF_OUT_INIT_HIGH;
+ else
+ cfg->ena_gpio_flags |= GPIOF_OUT_INIT_LOW;
+ }
+
+ if (of_property_read_bool(np, "gpio_open_drain"))
+ cfg->ena_gpio_flags |= GPIOF_OPEN_DRAIN;
+
+ return 0;
+}
+EXPORT_SYMBOL_GPL(of_get_regulator_gpio_config);
diff --git a/include/linux/regulator/of_regulator.h
b/include/linux/regulator/of_regulator.h
index 763953f7e3b8..eb4f1b6a26ba 100644
--- a/include/linux/regulator/of_regulator.h
+++ b/include/linux/regulator/of_regulator.h
@@ -7,6 +7,7 @@
#define __LINUX_OF_REG_H
struct regulator_desc;
+struct regulator_config;
struct of_regulator_match {
const char *name;
@@ -24,6 +25,10 @@ extern struct regulator_init_data
extern int of_regulator_match(struct device *dev, struct device_node *node,
struct of_regulator_match *matches,
unsigned int num_matches);
+extern int of_get_regulator_gpio_config(struct device *dev,
+ struct device_node *node,
+ const char *prop,
+ struct regulator_config *config);
#else
static inline struct regulator_init_data
*of_get_regulator_init_data(struct device *dev,
@@ -40,6 +45,15 @@ static inline int of_regulator_match(struct device *dev,
{
return 0;
}
+
+static inline int of_get_regulator_gpio_config(struct device *dev,
+ struct device_node *node,
+ const char *prop,
+ struct regulator_config *config)
+{
+ return 0;
+}
+
#endif /* CONFIG_OF */
#endif /* __LINUX_OF_REG_H */
--
2.8.3
