mirror of
https://github.com/AuxXxilium/linux_dsm_epyc7002.git
synced 2024-12-16 22:56:44 +07:00
regulator: core: Provide a dummy regulator with full constraints
When a system has said that it has fully specified constraints for its regulators it is still possible that some supplies may be missing, especially if regulator support has been added to a driver after the board was integrated. We can handle such situations more gracefully by providing a dummy regulator. Unless the caller has specifically indicated that the system design may not include a given regulator by using regulator_get_optional() or that it needs its interactions to have an effect using regulator_get_exclusive() provide a dummy regulator if we can't locate a real one. The kconfig option REGULATOR_DUMMY that provided similar behaviour for all regulators has been removed, systems that need it should flag that they have full constraints instead. Signed-off-by: Mark Brown <broonie@linaro.org>
This commit is contained in:
parent
272b98c645
commit
4ddfebd3b0
@ -28,16 +28,6 @@ config REGULATOR_DEBUG
|
||||
help
|
||||
Say yes here to enable debugging support.
|
||||
|
||||
config REGULATOR_DUMMY
|
||||
bool "Provide a dummy regulator if regulator lookups fail"
|
||||
help
|
||||
If this option is enabled then when a regulator lookup fails
|
||||
and the board has not specified that it has provided full
|
||||
constraints the regulator core will provide an always
|
||||
enabled dummy regulator, allowing consumer drivers to continue.
|
||||
|
||||
A warning will be generated when this substitution is done.
|
||||
|
||||
config REGULATOR_FIXED_VOLTAGE
|
||||
tristate "Fixed voltage regulator support"
|
||||
help
|
||||
|
@ -1243,7 +1243,7 @@ static struct regulator_dev *regulator_dev_lookup(struct device *dev,
|
||||
|
||||
/* Internal regulator request function */
|
||||
static struct regulator *_regulator_get(struct device *dev, const char *id,
|
||||
bool exclusive)
|
||||
bool exclusive, bool allow_dummy)
|
||||
{
|
||||
struct regulator_dev *rdev;
|
||||
struct regulator *regulator = ERR_PTR(-EPROBE_DEFER);
|
||||
@ -1268,30 +1268,32 @@ static struct regulator *_regulator_get(struct device *dev, const char *id,
|
||||
* If we have return value from dev_lookup fail, we do not expect to
|
||||
* succeed, so, quit with appropriate error value
|
||||
*/
|
||||
if (ret) {
|
||||
if (ret && ret != -ENODEV) {
|
||||
regulator = ERR_PTR(ret);
|
||||
goto out;
|
||||
}
|
||||
|
||||
if (board_wants_dummy_regulator) {
|
||||
rdev = dummy_regulator_rdev;
|
||||
goto found;
|
||||
}
|
||||
|
||||
#ifdef CONFIG_REGULATOR_DUMMY
|
||||
if (!devname)
|
||||
devname = "deviceless";
|
||||
|
||||
/* If the board didn't flag that it was fully constrained then
|
||||
* substitute in a dummy regulator so consumers can continue.
|
||||
/*
|
||||
* Assume that a regulator is physically present and enabled
|
||||
* even if it isn't hooked up and just provide a dummy.
|
||||
*/
|
||||
if (!has_full_constraints) {
|
||||
if (has_full_constraints && allow_dummy) {
|
||||
/*
|
||||
* Log the substitution if regulator configuration is
|
||||
* not complete to help development.
|
||||
*/
|
||||
if (!has_full_constraints)
|
||||
pr_warn("%s supply %s not found, using dummy regulator\n",
|
||||
devname, id);
|
||||
|
||||
rdev = dummy_regulator_rdev;
|
||||
goto found;
|
||||
} else {
|
||||
dev_err(dev, "dummy supplies not allowed\n");
|
||||
}
|
||||
#endif
|
||||
|
||||
mutex_unlock(®ulator_list_mutex);
|
||||
return regulator;
|
||||
@ -1349,7 +1351,7 @@ static struct regulator *_regulator_get(struct device *dev, const char *id,
|
||||
*/
|
||||
struct regulator *regulator_get(struct device *dev, const char *id)
|
||||
{
|
||||
return _regulator_get(dev, id, false);
|
||||
return _regulator_get(dev, id, false, true);
|
||||
}
|
||||
EXPORT_SYMBOL_GPL(regulator_get);
|
||||
|
||||
@ -1410,7 +1412,7 @@ EXPORT_SYMBOL_GPL(devm_regulator_get);
|
||||
*/
|
||||
struct regulator *regulator_get_exclusive(struct device *dev, const char *id)
|
||||
{
|
||||
return _regulator_get(dev, id, true);
|
||||
return _regulator_get(dev, id, true, false);
|
||||
}
|
||||
EXPORT_SYMBOL_GPL(regulator_get_exclusive);
|
||||
|
||||
@ -1439,7 +1441,7 @@ EXPORT_SYMBOL_GPL(regulator_get_exclusive);
|
||||
*/
|
||||
struct regulator *regulator_get_optional(struct device *dev, const char *id)
|
||||
{
|
||||
return _regulator_get(dev, id, 0);
|
||||
return _regulator_get(dev, id, false, false);
|
||||
}
|
||||
EXPORT_SYMBOL_GPL(regulator_get_optional);
|
||||
|
||||
|
Loading…
Reference in New Issue
Block a user