Some LDOs of Maxim 77686 PMIC support disabling during system suspend
(LDO{2,6,7,8,10,11,12,14,15,16}). This was already implemented as part
of set_suspend_mode function. In that case the mode was one of:
- disable,
- normal mode,
- low power mode.
However there are no bindings for setting the mode during suspend.
Add suspend disable for LDO regulators supporting this to the existing
max77686_buck_set_suspend_disable() function. This helps reducing
energy consumption during system sleep.
Signed-off-by: Krzysztof Kozlowski <k.kozlow...@samsung.com>
Reviewed-by: Javier Martinez Canillas <javier.marti...@collabora.co.uk>
---
drivers/regulator/max77686.c | 43 +++++++++++++++++++++++++++++++++++--------
1 file changed, 35 insertions(+), 8 deletions(-)
diff --git a/drivers/regulator/max77686.c b/drivers/regulator/max77686.c
index 3d0922051488..81f4b69adc82 100644
--- a/drivers/regulator/max77686.c
+++ b/drivers/regulator/max77686.c
@@ -87,18 +87,31 @@ struct max77686_data {
unsigned int opmode[MAX77686_REGULATORS];
};
-/* Some BUCKS supports Normal[ON/OFF] mode during suspend */
-static int max77686_buck_set_suspend_disable(struct regulator_dev *rdev)
+/* Some BUCKs and LDOs supports Normal[ON/OFF] mode during suspend */
+static int max77686_set_suspend_disable(struct regulator_dev *rdev)
{
unsigned int val;
struct max77686_data *max77686 = rdev_get_drvdata(rdev);
int ret, id = rdev_get_id(rdev);
- if (id == MAX77686_BUCK1)
+ switch (id) {
+ case MAX77686_BUCK1:
val = MAX77686_BUCK_OFF_PWRREQ;
- else
- val = MAX77686_BUCK_OFF_PWRREQ
- << MAX77686_OPMODE_BUCK234_SHIFT;
+ break;
+ case MAX77686_BUCK2 ... MAX77686_BUCK4:
+ val = MAX77686_BUCK_OFF_PWRREQ << MAX77686_OPMODE_BUCK234_SHIFT;
+ break;
+ case MAX77686_LDO2:
+ case MAX77686_LDO6 ... MAX77686_LDO8:
+ case MAX77686_LDO10 ... MAX77686_LDO12:
+ case MAX77686_LDO14 ... MAX77686_LDO16:
+ val = MAX77686_LDO_OFF_PWRREQ << MAX77686_OPMODE_SHIFT;
+ break;
+ default:
+ pr_warn("%s: regulator_suspend_disable not supported\n",
+ rdev->desc->name);
+ return -EINVAL;
+ }
ret = regmap_update_bits(rdev->regmap, rdev->desc->enable_reg,
rdev->desc->enable_mask, val);
@@ -180,6 +193,16 @@ static int max77686_enable(struct regulator_dev *rdev)
{
struct max77686_data *max77686 = rdev_get_drvdata(rdev);
+ /*
+ * One enable function is used for LDO and bucks. Assuming
+ * the same values are used for enable registers.
+ */
+ BUILD_BUG_ON(MAX77686_LDO_OFF_PWRREQ != MAX77686_BUCK_OFF_PWRREQ);
+ BUILD_BUG_ON(MAX77686_LDO_NORMAL != MAX77686_BUCK_NORMAL);
+
+ if (max77686->opmode[rdev_get_id(rdev)] == MAX77686_LDO_OFF_PWRREQ)
+ max77686->opmode[rdev_get_id(rdev)] = MAX77686_LDO_NORMAL;
+
return regmap_update_bits(rdev->regmap, rdev->desc->enable_reg,
rdev->desc->enable_mask,
max77686->opmode[rdev_get_id(rdev)]);
@@ -232,6 +255,8 @@ static struct regulator_ops max77686_ldo_ops = {
.set_voltage_sel = regulator_set_voltage_sel_regmap,
.set_voltage_time_sel = regulator_set_voltage_time_sel,
.set_suspend_mode = max77686_ldo_set_suspend_mode,
+ .set_suspend_disable = max77686_set_suspend_disable,
+ .set_suspend_enable = max77686_enable,
};
static struct regulator_ops max77686_buck1_ops = {
@@ -243,7 +268,8 @@ static struct regulator_ops max77686_buck1_ops = {
.get_voltage_sel = regulator_get_voltage_sel_regmap,
.set_voltage_sel = regulator_set_voltage_sel_regmap,
.set_voltage_time_sel = regulator_set_voltage_time_sel,
- .set_suspend_disable = max77686_buck_set_suspend_disable,
+ .set_suspend_disable = max77686_set_suspend_disable,
+ .set_suspend_enable = max77686_enable,
};
static struct regulator_ops max77686_buck_dvs_ops = {
@@ -256,7 +282,8 @@ static struct regulator_ops max77686_buck_dvs_ops = {
.set_voltage_sel = regulator_set_voltage_sel_regmap,
.set_voltage_time_sel = regulator_set_voltage_time_sel,
.set_ramp_delay = max77686_set_ramp_delay,
- .set_suspend_disable = max77686_buck_set_suspend_disable,
+ .set_suspend_disable = max77686_set_suspend_disable,
+ .set_suspend_enable = max77686_enable,
};
#define regulator_desc_ldo(num) {
\
--
1.9.1
--
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