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Commit 1c8fa58f authored by Thierry Reding's avatar Thierry Reding Committed by Mark Brown
Browse files

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: default avatarThierry Reding <thierry.reding@avionic-design.de>
Signed-off-by: default avatarMark Brown <broonie@opensource.wolfsonmicro.com>
parent 82caa978

drivers/regulator/of_regulator.c

+47 −0
Original line number Diff line number Diff line
@@ -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);

include/linux/regulator/of_regulator.h

+18 −0
Original line number Diff line number Diff line
@@ -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 */