[RFC PATCH 09/11] DT: regulator: Helper to extract regulator node based on supply name

Rajendra Nayak
2011-09-15T11:22:41Z

Device nodes in DT can associate themselves with one or more
regulators by providing a list of phandles (to regulator nodes)
and corresponding supply names.

For Example:
devicenode: node@0x0 {
...
...
regulator = <&regulator1>,<&regulator2>;
regulator-names = "supply1","supply2";
};

of_get_regulator() extracts the regulator node for a given
device, based on the supply name.

Signed-off-by: Rajendra Nayak <rnayak@ti.com>
---
drivers/of/of_regulator.c | 37 +++++++++++++++++++++++++++++++++++++
include/linux/of_regulator.h | 7 +++++++
2 files changed, 44 insertions(+), 0 deletions(-)

diff --git a/drivers/of/of_regulator.c b/drivers/of/of_regulator.c
index 4d7a49d..6f8fd4e 100644
--- a/drivers/of/of_regulator.c
+++ b/drivers/of/of_regulator.c
@@ -114,3 +114,40 @@ struct fixed_voltage_config *of_get_fixed_voltage_config(struct device_node *np)
return config;
}
EXPORT_SYMBOL(of_get_fixed_voltage_config);
+
+/**
+ * of_get_regulator - get a regulator device node based on supply name
+ * @dev: Device pointer for the consumer (of regulator) device
+ * @supply: regulator supply name
+ *
+ * Extract the regulator device node corresponding to the supply name.
+ * retruns the device node corresponding to the regulator if found, else
+ * returns NULL.
+ */
+struct device_node *of_get_regulator(struct device *dev, const char *supply)
+{
+ struct device_node *regnode = NULL;
+ u32 reghandle;
+ int regsz, namesz;
+ const void *regprop;
+ const char *namesprop;
+
+ regprop = of_get_property(dev->of_node, "regulator", &regsz);
+ namesprop = of_get_property(dev->of_node, "regulator-names", &namesz);
+ if (!regprop || !namesprop)
+ return NULL;
+
+ while (regsz && namesz) {
+ if (!strcmp(namesprop, supply)) {
+ reghandle = be32_to_cpup(regprop);
+ regnode = of_find_node_by_phandle(reghandle);
+ break;
+ }
+ regsz -= 4;
+ regprop += 4;
+ namesz -= strlen(namesprop) + 1;
+ namesprop += strlen(namesprop) + 1;
+ }
+ return regnode;
+}
+EXPORT_SYMBOL(of_get_regulator);
diff --git a/include/linux/of_regulator.h b/include/linux/of_regulator.h
index 39860c5..5fc7329 100644
--- a/include/linux/of_regulator.h
+++ b/include/linux/of_regulator.h
@@ -13,6 +13,8 @@ extern struct regulator_init_data
*of_get_regulator_init_data(struct device_node *np);
extern struct fixed_voltage_config
*of_get_fixed_voltage_config(struct device_node *np);
+extern struct device_node *of_get_regulator(struct device *dev,
+ const char *id);
#else
static inline struct regulator_init_data
*of_get_regulator_init_data(struct device_node *np)
@@ -24,6 +26,11 @@ static inline struct fixed_voltage_config
{
return NULL;
}
+static inline struct device_node *of_get_regulator(struct device *dev,
+ const char *id)
+{
+ return NULL;
+}
#endif /* CONFIG_OF_REGULATOR */

#endif /* __LINUX_OF_REG_H */
--
1.7.1