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regulator: Allow boot_on regulators to be disabled by clients 

Rather than incrementing the reference count for boot_on regulators
(which prevents them being disabled later on) simply force the
regulator to be enabled when applying the constraints. Previously
boot_on was essentially equivalent to always_on.

Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
Signed-off-by: Liam Girdwood <lrg@slimlogic.co.uk>
This commit is contained in:
Mark Brown 2009-03-02 16:32:46 +00:00 committed by Liam Girdwood
parent 221a7c7c9c
commit cacf90f24e
2 changed files with 7 additions and 10 deletions
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13
drivers/regulator/core.c
View File

@ -776,10 +776,6 @@ static int set_machine_constraints(struct regulator_dev *rdev,
}
}
/* are we enabled at boot time by firmware / bootloader */
if (rdev->constraints->boot_on)
rdev->use_count = 1;
/* do we need to setup our suspend state */
if (constraints->initial_state) {
ret = suspend_prepare(rdev, constraints->initial_state);
@ -808,11 +804,10 @@ static int set_machine_constraints(struct regulator_dev *rdev,
}
}
/* if always_on is set then turn the regulator on if it's not
* already on. */
if (constraints->always_on && ops->enable &&
((ops->is_enabled && !ops->is_enabled(rdev)) ||
(!ops->is_enabled && !constraints->boot_on))) {
/* If the constraints say the regulator should be on at this point
* and we have control then make sure it is enabled.
*/
if ((constraints->always_on || constraints->boot_on) && ops->enable) {
ret = ops->enable(rdev);
if (ret < 0) {
printk(KERN_ERR "%s: failed to enable %s\n",

4
include/linux/regulator/machine.h
View File

@ -73,7 +73,9 @@ struct regulator_state {
*
* @always_on: Set if the regulator should never be disabled.
* @boot_on: Set if the regulator is enabled when the system is initially
* started.
* started. If the regulator is not enabled by the hardware or
* bootloader then it will be enabled when the constraints are
* applied.
* @apply_uV: Apply the voltage constraint when initialising.
*
* @input_uV: Input voltage for regulator when supplied by another regulator.