MLK-11252-01 ARM: imx: dts: add gpio regulator to control the dc-dc voltage on imx6ul...

For the i.MX6UL EVK board, according to the latest schematic, use a GPIO pin along with
the 'PMIC_STBY_REQ' pin to control the DC-DC voltage output. the possible voltage output
as below:

PMIC_STBY_REQ = 0, GPIO_DVFS = 0, output is 1.4V (1.375V + 25mV) <Default>
PMIC_STBY_REQ = 0, GPIO_DVFS = 1, output is 1.3V (1.275V + 25mV)
PMIC_STBY_REQ = 1, GPIO_DVFS = 0, output is 0.925V (0.9V + 25mV)

In normal run mode, the voltage output should be changed using the 'GPIO_DVFS' pin,
so add gpio regulator to control it.

Signed-off-by: Bai Ping <b51503@freescale.com>
(cherry picked from commit 4517cf404b4e0cfb805a9d0c412b2f2839400d9b)

diff --git a/arch/arm/configs/imx_v7_defconfig b/arch/arm/configs/imx_v7_defconfig
index 0ceb272..f3e6334 100644 (file)
--- a/arch/arm/configs/imx_v7_defconfig
+++ b/arch/arm/configs/imx_v7_defconfig
@@ -209,6 +209,7 @@ CONFIG_REGULATOR=y
 CONFIG_REGULATOR_FIXED_VOLTAGE=y
 CONFIG_REGULATOR_ANATOP=y
 CONFIG_REGULATOR_DA9052=y
+CONFIG_REGULATOR_GPIO=y
 CONFIG_REGULATOR_MAX17135=y
 CONFIG_REGULATOR_MC13783=y
 CONFIG_REGULATOR_MC13892=y