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power: regulator: Add support for regulator-force-boot-off 

Add support for regulator-force-boot-off DT property.
This property can be used by the board/device drivers for
turning off regulators on early init stages as pre-requisite
for the other components initialization.

Signed-off-by: Konstantin Porotchkin <kostap@marvell.com>
Signed-off-by: Stefan Roese <sr@denx.de>
Cc: Jaehoon Chung <jh80.chung@samsung.com>
Cc: Simon Glass <sjg@chromium.org>
Reviewed-by: Jaehoon Chung <jh80.chung@samsung.com>
This commit is contained in:
Konstantin Porotchkin 2017-05-29 15:59:38 +03:00 committed by Stefan Roese
parent 939c4934c8
commit fec8c900c8
2 changed files with 61 additions and 0 deletions
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38
drivers/power/regulator/regulator-uclass.c
View File

@ -311,6 +311,17 @@ int regulator_autoset(struct udevice *dev)
return ret;
}
int regulator_unset(struct udevice *dev)
{
struct dm_regulator_uclass_plat *uc_pdata;
uc_pdata = dev_get_uclass_plat(dev);
if (uc_pdata && uc_pdata->force_off)
return regulator_set_enable(dev, false);
return -EMEDIUMTYPE;
}
static void regulator_show(struct udevice *dev, int ret)
{
struct dm_regulator_uclass_plat *uc_pdata;
@ -443,6 +454,7 @@ static int regulator_pre_probe(struct udevice *dev)
uc_pdata->boot_on = dev_read_bool(dev, "regulator-boot-on");
uc_pdata->ramp_delay = dev_read_u32_default(dev, "regulator-ramp-delay",
0);
uc_pdata->force_off = dev_read_bool(dev, "regulator-force-boot-off");
node = dev_read_subnode(dev, "regulator-state-mem");
if (ofnode_valid(node)) {
@ -495,6 +507,32 @@ int regulators_enable_boot_on(bool verbose)
return ret;
}
int regulators_enable_boot_off(bool verbose)
{
struct udevice *dev;
struct uclass *uc;
int ret;
ret = uclass_get(UCLASS_REGULATOR, &uc);
if (ret)
return ret;
for (uclass_first_device(UCLASS_REGULATOR, &dev);
dev;
uclass_next_device(&dev)) {
ret = regulator_unset(dev);
if (ret == -EMEDIUMTYPE) {
ret = 0;
continue;
}
if (verbose)
regulator_show(dev, ret);
if (ret == -ENOSYS)
ret = 0;
}
return ret;
}
UCLASS_DRIVER(regulator) = {
.id = UCLASS_REGULATOR,
.name = "regulator",

23
include/power/regulator.h
View File

@ -151,6 +151,7 @@ enum regulator_flag {
* @max_uA* - maximum amperage (micro Amps)
* @always_on* - bool type, true or false
* @boot_on* - bool type, true or false
* @force_off* - bool type, true or false
* TODO(sjg@chromium.org): Consider putting the above two into @flags
* @ramp_delay - Time to settle down after voltage change (unit: uV/us)
* @flags: - flags value (see REGULATOR_FLAG_...)
@ -176,6 +177,7 @@ struct dm_regulator_uclass_plat {
unsigned int ramp_delay;
bool always_on;
bool boot_on;
bool force_off;
const char *name;
int flags;
u8 ctrl_reg;
@ -420,6 +422,15 @@ int regulator_set_mode(struct udevice *dev, int mode_id);
*/
int regulators_enable_boot_on(bool verbose);
/**
* regulators_enable_boot_off() - disable regulators needed for boot
*
* This disables all regulators which are marked to be off at boot time.
*
* This effectively calls regulator_unset() for every regulator.
*/
int regulators_enable_boot_off(bool verbose);
/**
* regulator_autoset: setup the voltage/current on a regulator
*
@ -439,6 +450,18 @@ int regulators_enable_boot_on(bool verbose);
*/
int regulator_autoset(struct udevice *dev);
/**
* regulator_unset: turn off a regulator
*
* The setup depends on constraints found in device's uclass's platform data
* (struct dm_regulator_uclass_platdata):
*
* - Disable - will set - if 'force_off' is set to true,
*
* The function returns on the first-encountered error.
*/
int regulator_unset(struct udevice *dev);
/**
* regulator_autoset_by_name: setup the regulator given by its uclass's
* platform data name field. The setup depends on constraints found in device's