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regulator: core: Limit propagation of parent voltage count and list 

Commit 26988efe11 ("regulator: core: Allow to get voltage count and
list from parent") introduces the propagation of the parent voltage
count and list for regulators that don't provide this information
themselves. The goal is to support simple switch regulators, however as
a side effect normal continuous regulators can leak details of their
supplies and provide consumers with inconsistent information.

Limit the propagation of the voltage count and list to switch
regulators.

Fixes: 26988efe11 ("regulator: core: Allow to get voltage count and
  list from parent")
Signed-off-by: Matthias Kaehlcke <mka@chromium.org>
Reviewed-by: Javier Martinez Canillas <javier@osg.samsung.com>
Tested-by: Javier Martinez Canillas <javier@osg.samsung.com>
Signed-off-by: Mark Brown <broonie@kernel.org>
This commit is contained in:
Matthias Kaehlcke 2017-03-27 16:54:12 -07:00 committed by Mark Brown
parent fffd113338
commit fd08604555
2 changed files with 9 additions and 2 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

9
drivers/regulator/core.c
View File

@ -2484,7 +2484,7 @@ static int _regulator_list_voltage(struct regulator *regulator,
ret = ops->list_voltage(rdev, selector);
if (lock)
mutex_unlock(&rdev->mutex);
} else if (rdev->supply) {
} else if (rdev->is_switch && rdev->supply) {
ret = _regulator_list_voltage(rdev->supply, selector, lock);
} else {
return -EINVAL;
@ -2542,7 +2542,7 @@ int regulator_count_voltages(struct regulator *regulator)
if (rdev->desc->n_voltages)
return rdev->desc->n_voltages;
if (!rdev->supply)
if (!rdev->is_switch || !rdev->supply)
return -EINVAL;
return regulator_count_voltages(rdev->supply);
@ -4097,6 +4097,11 @@ regulator_register(const struct regulator_desc *regulator_desc,
mutex_unlock(&regulator_list_mutex);
}
if (!rdev->desc->ops->get_voltage &&
!rdev->desc->ops->list_voltage &&
!rdev->desc->fixed_uV)
rdev->is_switch = true;
ret = device_register(&rdev->dev);
if (ret != 0) {
put_device(&rdev->dev);

2
include/linux/regulator/driver.h
View File

@ -429,6 +429,8 @@ struct regulator_dev {
struct regulator_enable_gpio *ena_pin;
unsigned int ena_gpio_state:1;
unsigned int is_switch:1;
/* time when this regulator was disabled last time */
unsigned long last_off_jiffy;
};