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regulator: Defer lookup of supply to regulator_get

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Instead of resolving regulator supplies during registration move this to
the time of a consumer retrieving a handle. The benefit is that it's
possible for one driver to register regulators with internal
dependencies out of order.

Signed-off-by: Bjorn Andersson <bjorn.andersson@sonymobile.com>
Signed-off-by: Mark Brown <broonie@kernel.org>
This commit is contained in:
Bjorn Andersson 2015-03-24 18:56:05 -07:00 committed by Mark Brown
parent 5c9e719691
commit 6261b06de5
2 changed files with 57 additions and 36 deletions
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92
drivers/regulator/core.c
View File

@ -1316,6 +1316,54 @@ static struct regulator_dev *regulator_dev_lookup(struct device *dev,
return NULL;
}
static int regulator_resolve_supply(struct regulator_dev *rdev)
{
struct regulator_dev *r;
struct device *dev = rdev->dev.parent;
int ret;
/* No supply to resovle? */
if (!rdev->supply_name)
return 0;
/* Supply already resolved? */
if (rdev->supply)
return 0;
r = regulator_dev_lookup(dev, rdev->supply_name, &ret);
if (ret == -ENODEV) {
/*
* No supply was specified for this regulator and
* there will never be one.
*/
return 0;
}
if (!r) {
dev_err(dev, "Failed to resolve %s-supply for %s\n",
rdev->supply_name, rdev->desc->name);
return -EPROBE_DEFER;
}
/* Recursively resolve the supply of the supply */
ret = regulator_resolve_supply(r);
if (ret < 0)
return ret;
ret = set_supply(rdev, r);
if (ret < 0)
return ret;
/* Cascade always-on state to supply */
if (_regulator_is_enabled(rdev)) {
ret = regulator_enable(rdev->supply);
if (ret < 0)
return ret;
}
return 0;
}
/* Internal regulator request function */
static struct regulator *_regulator_get(struct device *dev, const char *id,
bool exclusive, bool allow_dummy)
@ -1385,6 +1433,12 @@ found:
goto out;
}
ret = regulator_resolve_supply(rdev);
if (ret < 0) {
regulator = ERR_PTR(ret);
goto out;
}
if (!try_module_get(rdev->owner))
goto out;
@ -3536,7 +3590,6 @@ regulator_register(const struct regulator_desc *regulator_desc,
struct regulator_dev *rdev;
struct device *dev;
int ret, i;
const char *supply = NULL;
if (regulator_desc == NULL || cfg == NULL)
return ERR_PTR(-EINVAL);
@ -3650,41 +3703,10 @@ regulator_register(const struct regulator_desc *regulator_desc,
goto scrub;
if (init_data && init_data->supply_regulator)
supply = init_data->supply_regulator;
rdev->supply_name = init_data->supply_regulator;
else if (regulator_desc->supply_name)
supply = regulator_desc->supply_name;
rdev->supply_name = regulator_desc->supply_name;
if (supply) {
struct regulator_dev *r;
r = regulator_dev_lookup(dev, supply, &ret);
if (ret == -ENODEV) {
/*
* No supply was specified for this regulator and
* there will never be one.
*/
ret = 0;
goto add_dev;
} else if (!r) {
dev_err(dev, "Failed to find supply %s\n", supply);
ret = -EPROBE_DEFER;
goto scrub;
}
ret = set_supply(rdev, r);
if (ret < 0)
goto scrub;
/* Enable supply if rail is enabled */
if (_regulator_is_enabled(rdev)) {
ret = regulator_enable(rdev->supply);
if (ret < 0)
goto scrub;
}
}
add_dev:
/* add consumers devices */
if (init_data) {
for (i = 0; i < init_data->num_consumer_supplies; i++) {
@ -3711,8 +3733,6 @@ unset_supplies:
unset_regulator_supplies(rdev);
scrub:
if (rdev->supply)
_regulator_put(rdev->supply);
regulator_ena_gpio_free(rdev);
kfree(rdev->constraints);
wash:

1
include/linux/regulator/driver.h
View File

@ -367,6 +367,7 @@ struct regulator_dev {
struct device dev;
struct regulation_constraints *constraints;
struct regulator *supply; /* for tree */
const char *supply_name;
struct regmap *regmap;
struct delayed_work disable_work;