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regulator: Allow parsing custom properties when using simplified DT parsing

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When drivers use simplified DT parsing method (they provide
'regulator_desc.of_match') they still may want to parse custom
properties for some of the regulators. For example some of the
regulators support GPIO enable control.

Add a driver-supplied callback for such case. This way the regulator
core parses common bindings offloading a lot of code from drivers and
still custom properties may be used.

The callback, called for each parsed regulator, may modify the
'regulator_config' initially passed to regulator_register().

Signed-off-by: Krzysztof Kozlowski <k.kozlowski@samsung.com>
Signed-off-by: Mark Brown <broonie@kernel.org>
This commit is contained in:
Krzysztof Kozlowski 2015-01-05 12:48:42 +01:00 committed by Mark Brown
parent 1b3de22338
commit bfa21a0dfe
4 changed files with 27 additions and 1 deletions
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2
drivers/regulator/core.c
View File

@ -3635,7 +3635,7 @@ regulator_register(const struct regulator_desc *regulator_desc,
return ERR_PTR(-ENOMEM);
}
init_data = regulator_of_get_init_data(dev, regulator_desc,
init_data = regulator_of_get_init_data(dev, regulator_desc, config,
&rdev->dev.of_node);
if (!init_data) {
init_data = config->init_data;

2
drivers/regulator/internal.h
View File

@ -38,11 +38,13 @@ struct regulator {
#ifdef CONFIG_OF
struct regulator_init_data *regulator_of_get_init_data(struct device *dev,
const struct regulator_desc *desc,
struct regulator_config *config,
struct device_node **node);
#else
static inline struct regulator_init_data *
regulator_of_get_init_data(struct device *dev,
const struct regulator_desc *desc,
struct regulator_config *config,
struct device_node **node)
{
return NULL;

11
drivers/regulator/of_regulator.c
View File

@ -270,6 +270,7 @@ EXPORT_SYMBOL_GPL(of_regulator_match);
struct regulator_init_data *regulator_of_get_init_data(struct device *dev,
const struct regulator_desc *desc,
struct regulator_config *config,
struct device_node **node)
{
struct device_node *search, *child;
@ -307,6 +308,16 @@ struct regulator_init_data *regulator_of_get_init_data(struct device *dev,
break;
}
if (desc->of_parse_cb) {
if (desc->of_parse_cb(child, desc, config)) {
dev_err(dev,
"driver callback failed to parse DT for regulator %s\n",
child->name);
init_data = NULL;
break;
}
}
of_node_get(child);
*node = child;
break;

13
include/linux/regulator/driver.h
View File

@ -21,6 +21,7 @@
struct regmap;
struct regulator_dev;
struct regulator_config;
struct regulator_init_data;
struct regulator_enable_gpio;
@ -205,6 +206,15 @@ enum regulator_type {
* @supply_name: Identifying the regulator supply
* @of_match: Name used to identify regulator in DT.
* @regulators_node: Name of node containing regulator definitions in DT.
* @of_parse_cb: Optional callback called only if of_match is present.
* Will be called for each regulator parsed from DT, during
* init_data parsing.
* The regulator_config passed as argument to the callback will
* be a copy of config passed to regulator_register, valid only
* for this particular call. Callback may freely change the
* config but it cannot store it for later usage.
* Callback should return 0 on success or negative ERRNO
* indicating failure.
* @id: Numerical identifier for the regulator.
* @ops: Regulator operations table.
* @irq: Interrupt number for the regulator.
@ -251,6 +261,9 @@ struct regulator_desc {
const char *supply_name;
const char *of_match;
const char *regulators_node;
int (*of_parse_cb)(struct device_node *,
const struct regulator_desc *,
struct regulator_config *);
int id;
bool continuous_voltage_range;
unsigned n_voltages;