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author | Thierry Reding <thierry.reding@avionic-design.de> | 2012-04-26 16:52:20 +0200 |
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committer | Mark Brown <broonie@opensource.wolfsonmicro.com> | 2012-05-04 13:25:15 +0100 |
commit | 1c8fa58f4750e9ad722fbf899866c312ffabab67 (patch) | |
tree | bd7aa14a3d78d17da9eb7c7638a66562f78b6f9f /drivers/regulator/of_regulator.c | |
parent | 82caa9780a85a97e45e4df6e1f228279707bdcfe (diff) | |
download | linux-1c8fa58f4750e9ad722fbf899866c312ffabab67.tar.gz linux-1c8fa58f4750e9ad722fbf899866c312ffabab67.tar.bz2 linux-1c8fa58f4750e9ad722fbf899866c312ffabab67.zip |
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>
Diffstat (limited to 'drivers/regulator/of_regulator.c')
-rw-r--r-- | drivers/regulator/of_regulator.c | 47 |
1 files changed, 47 insertions, 0 deletions
diff --git a/drivers/regulator/of_regulator.c b/drivers/regulator/of_regulator.c index 679734d26a16..56593b75168a 100644 --- a/drivers/regulator/of_regulator.c +++ b/drivers/regulator/of_regulator.c @@ -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); |