[PATCH 8/9] regulator: helper to extract regulator node based on supply name
From: Rajendra Nayak <hidden>
Date: 2011-09-27 10:12:51
Also in:
linux-arm-kernel, linux-omap
Subsystem:
the rest, voltage and current regulator framework · Maintainers:
Linus Torvalds, Liam Girdwood, Mark Brown
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 {
...
...
vmmc-supply = <®ulator1>;
vpll-supply = <®ulator1>;
};
The driver would then do a regulator_get(dev, "vmmc"); to get
regulator1 and do a regulator_get(dev, "vpll"); to get
regulator2.
of_get_regulator() extracts the regulator node for a given
device, based on the supply name.
Signed-off-by: Rajendra Nayak <redacted>
---
drivers/regulator/of_regulator.c | 39 ++++++++++++++++++++++++++++++++
include/linux/regulator/of_regulator.h | 7 +++++
2 files changed, 46 insertions(+), 0 deletions(-)
diff --git a/drivers/regulator/of_regulator.c b/drivers/regulator/of_regulator.c
index 7fa63ff..49dd105 100644
--- a/drivers/regulator/of_regulator.c
+++ b/drivers/regulator/of_regulator.c@@ -14,6 +14,45 @@ #include <linux/of.h> #include <linux/regulator/machine.h> + +/** + * 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; + char prop_name[32]; /* 32 is max size of property name */ + const void *prop; + int sz; + + if (!dev) + return NULL; + + dev_dbg(dev, "Looking up %s-supply from device tree\n", supply); + + snprintf(prop_name, 32, "%s-supply", supply); + + prop = of_get_property(dev->of_node, prop_name, &sz); + if (!prop || sz < 4) + return NULL; + + reghandle = be32_to_cpup(prop); + regnode = of_find_node_by_phandle(reghandle); + if (!regnode) { + pr_warn("%s: %s property in node %s references invalid phandle", + __func__, prop_name, dev->of_node->full_name); + return NULL; + } + return regnode; +} + static void of_get_regulation_constraints(struct device_node *np, struct regulator_init_data **init_data) {
diff --git a/include/linux/regulator/of_regulator.h b/include/linux/regulator/of_regulator.h
index 3f63be9..edaba1a 100644
--- a/include/linux/regulator/of_regulator.h
+++ b/include/linux/regulator/of_regulator.h@@ -9,12 +9,19 @@ #if defined(CONFIG_OF_REGULATOR) extern struct regulator_init_data *of_get_regulator_init_data(struct device *dev); +extern struct device_node *of_get_regulator(struct device *dev, + const char *supply); #else static inline struct regulator_init_data *of_get_regulator_init_data(struct device_node *np) { 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