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regulator: Add generic DT parsing for regulators 

Looking up init data for regulators found on chips is a common operation
that can be handled in a generic way. The new helper function introduced
by this patch looks up the children of a given node by names specified
in a match table and fills that match table with information parsed from
the DT.

This is based on work by Rhyland Klein <rklein@nvidia.com>.

Signed-off-by: Thierry Reding <thierry.reding@avionic-design.de>
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
This commit is contained in:
Thierry Reding 2012-04-26 16:52:20 +02:00 committed by Mark Brown
parent 82caa9780a
commit 1c8fa58f47
2 changed files with 65 additions and 0 deletions
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47
drivers/regulator/of_regulator.c
View File

@ -14,6 +14,7 @@
#include <linux/slab.h>
#include <linux/of.h>
#include <linux/regulator/machine.h>
#include <linux/regulator/of_regulator.h>
static void of_get_regulation_constraints(struct device_node *np,
struct regulator_init_data **init_data)
@ -85,3 +86,49 @@ struct regulator_init_data *of_get_regulator_init_data(struct device *dev,
return init_data;
}
EXPORT_SYMBOL_GPL(of_get_regulator_init_data);
/**
* of_regulator_match - extract regulator init data
* @dev: device requesting the data
* @node: parent device node of the regulators
* @matches: match table for the regulators
* @num_matches: number of entries in match table
*
* This function uses a match table specified by the regulator driver and
* looks up the corresponding init data in the device tree. Note that the
* match table is modified in place.
*
* Returns the number of matches found or a negative error code on failure.
*/
int of_regulator_match(struct device *dev, struct device_node *node,
struct of_regulator_match *matches,
unsigned int num_matches)
{
unsigned int count = 0;
unsigned int i;
if (!dev || !node)
return -EINVAL;
for (i = 0; i < num_matches; i++) {
struct of_regulator_match *match = &matches[i];
struct device_node *child;
child = of_find_node_by_name(node, match->name);
if (!child)
continue;
match->init_data = of_get_regulator_init_data(dev, child);
if (!match->init_data) {
dev_err(dev, "failed to parse DT for regulator %s\n",
child->name);
return -EINVAL;
}
match->of_node = child;
count++;
}
return count;
}
EXPORT_SYMBOL_GPL(of_regulator_match);

18
include/linux/regulator/of_regulator.h
View File

@ -6,10 +6,20 @@
#ifndef __LINUX_OF_REG_H
#define __LINUX_OF_REG_H
struct of_regulator_match {
const char *name;
void *driver_data;
struct regulator_init_data *init_data;
struct device_node *of_node;
};
#if defined(CONFIG_OF)
extern struct regulator_init_data
*of_get_regulator_init_data(struct device *dev,
struct device_node *node);
extern int of_regulator_match(struct device *dev, struct device_node *node,
struct of_regulator_match *matches,
unsigned int num_matches);
#else
static inline struct regulator_init_data
*of_get_regulator_init_data(struct device *dev,
@ -17,6 +27,14 @@ static inline struct regulator_init_data
{
return NULL;
}
static inline int of_regulator_match(struct device *dev,
struct device_node *node,
struct of_regulator_match *matches,
unsigned int num_matches)
{
return 0;
}
#endif /* CONFIG_OF */
#endif /* __LINUX_OF_REG_H */