diff options
| author | Krzysztof Kozlowski <k.kozlowski@samsung.com> | 2014-01-24 17:37:57 +0400 |
|---|---|---|
| committer | Mark Brown <broonie@linaro.org> | 2014-01-28 00:24:17 +0400 |
| commit | ee1e0994ab1bd302fd03432de79c07751df47ffa (patch) | |
| tree | 04ecbe1f9b036da25496727fd2d4ced15f8f22dd /include/linux/mfd/samsung | |
| parent | 07b19808486054f356dbf3495a277f51af062b35 (diff) | |
| download | linux-ee1e0994ab1bd302fd03432de79c07751df47ffa.tar.xz | |
regulator: s5m8767: Use GPIO for controlling Buck9/eMMC
Add support for GPIO control (enable/disable) over Buck9. The Buck9
Converter is used as a supply for eMMC Host Controller.
BUCK9EN GPIO of S5M8767 chip may be used by application processor to
enable or disable the Buck9. This has two benefits:
- It is faster than toggling it over I2C bus.
- It allows disabling the regulator during suspend to RAM; The AP will
enable it during resume; Without the patch the regulator supplying
eMMC must be defined as fixed-regulator.
Signed-off-by: Krzysztof Kozlowski <k.kozlowski@samsung.com>
Acked-by: Lee Jones <lee.jones@linaro.org>
Signed-off-by: Mark Brown <broonie@linaro.org>
Diffstat (limited to 'include/linux/mfd/samsung')
| -rw-r--r-- | include/linux/mfd/samsung/core.h | 3 | ||||
| -rw-r--r-- | include/linux/mfd/samsung/s5m8767.h | 7 |
2 files changed, 9 insertions, 1 deletions
diff --git a/include/linux/mfd/samsung/core.h b/include/linux/mfd/samsung/core.h index 41c9bde410c5..55510444b9fd 100644 --- a/include/linux/mfd/samsung/core.h +++ b/include/linux/mfd/samsung/core.h @@ -119,7 +119,8 @@ struct sec_platform_data { struct sec_regulator_data { int id; struct regulator_init_data *initdata; - struct device_node *reg_node; + struct device_node *reg_node; + int ext_control_gpio; }; /* diff --git a/include/linux/mfd/samsung/s5m8767.h b/include/linux/mfd/samsung/s5m8767.h index 2ab0b0f03641..243b58fec33d 100644 --- a/include/linux/mfd/samsung/s5m8767.h +++ b/include/linux/mfd/samsung/s5m8767.h @@ -183,10 +183,17 @@ enum s5m8767_regulators { S5M8767_REG_MAX, }; +/* LDO_EN/BUCK_EN field in registers */ #define S5M8767_ENCTRL_SHIFT 6 #define S5M8767_ENCTRL_MASK (0x3 << S5M8767_ENCTRL_SHIFT) /* + * LDO_EN/BUCK_EN register value for controlling this Buck or LDO + * by GPIO (PWREN, BUCKEN). + */ +#define S5M8767_ENCTRL_USE_GPIO 0x1 + +/* * Values for BUCK_RAMP field in DVS_RAMP register, matching raw values * in mV/us. */ |