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regulator: tps65132: add low power mode control for enable pins

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Add ti,en-gpio-lpm property to set the enable pins to input/pull
down state when the boost regulator being disabled. This can reduce the
rock bottom power numbers when system entering into sleep state with the
regulators disabled.

Take this chance to correct a typo of drive-strength property specified
in tps65132-en-pin pin group node for msm8916 QRD SKUH board.

Change-Id: I2c2df1f4893c31deeba02c3b2988d1157bdb7b61
Signed-off-by: Fenglin Wu <fenglinw@codeaurora.org>
This commit is contained in:
Fenglin Wu 2014-05-16 11:20:02 +08:00
parent 70b9d27d05
commit ea781109ae
3 changed files with 19 additions and 4 deletions
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2
Documentation/devicetree/bindings/regulator/tps65132-regulator.txt
View file

@ -19,6 +19,8 @@ Optional properties:
pinctrl for EN-pins.
For details of pinctrl properties, please refer to:
"Documentation/devicetree/bindings/pinctrl/pinctrl-bindings.txt"
- ti,en-gpio-lpm: A boolean flag to indicate if the enable pin is configured
to low power mode (LPM) when the output is disabled.
Regulator child node required properties:
- regulator-name: A string used as a descriptive name for the regulator

5
arch/arm/boot/dts/qcom/msm8916-qrd-skuh.dtsi
View file

@ -51,8 +51,8 @@
qcom,pin-func = <0>;
tps65132_en_default: en-default {
driver-strength = <2>;
bias-disable;
drive-strength = <2>;
bias-pull-down;
};
};
};
@ -116,6 +116,7 @@
compatible = "ti,tps65132";
reg = <0x3e>;
i2c-pwr-supply = <&pm8916_l6>;
ti,en-gpio-lpm;
pinctrl-names = "default";
pinctrl-0 = <&tps65132_en_default>;

16
drivers/regulator/tps65132-regulator.c
View file

@ -59,6 +59,7 @@ struct tps65132_chip {
u8 apps_cfg_bit_pos;
u8 apps_dischg_val;
bool apps_dischg_cfg_postpone;
bool en_gpio_lpm;
};
#define TPS65132_REG_VPOS 0x00
@ -99,9 +100,14 @@ static struct of_regulator_match tps65132_reg_matches[] = {
static int tps65132_regulator_disable(struct regulator_dev *rdev)
{
struct tps65132_regulator *vreg = rdev_get_drvdata(rdev);
struct tps65132_chip *chip = vreg->chip;
gpio_set_value_cansleep(vreg->en_gpio,
if (chip->en_gpio_lpm)
gpio_direction_input(vreg->en_gpio);
else
gpio_set_value_cansleep(vreg->en_gpio,
vreg->gpio_flags & OF_GPIO_ACTIVE_LOW ? 1 : 0);
vreg->is_enabled = false;
return 0;
@ -113,7 +119,11 @@ static int tps65132_regulator_enable(struct regulator_dev *rdev)
struct tps65132_chip *chip = vreg->chip;
int rc;
gpio_set_value_cansleep(vreg->en_gpio,
if (chip->en_gpio_lpm)
gpio_direction_output(vreg->en_gpio,
vreg->gpio_flags & OF_GPIO_ACTIVE_LOW ? 0 : 1);
else
gpio_set_value_cansleep(vreg->en_gpio,
vreg->gpio_flags & OF_GPIO_ACTIVE_LOW ? 0 : 1);
vreg->is_enabled = true;
@ -386,6 +396,8 @@ static int tps65132_parse_dt(struct tps65132_chip *chip,
return rc;
}
}
chip->en_gpio_lpm = of_property_read_bool(client->dev.of_node,
"ti,en-gpio-lpm");
for (i = 0; i < chip->num_regulators; i++) {
match = &tps65132_reg_matches[i];