power: regulator: s2mps11: Add enable delay

According to datasheet, the output on LDO regulators will start
appearing after 10-15 us.

Signed-off-by: Krzysztof Kozlowski <krzk@kernel.org>
Tested-by: Anand Moon <linux.amoon@gmail.com>
Signed-off-by: Minkyu Kang <mk7.kang@samsung.com>

diff --git a/drivers/power/regulator/s2mps11_regulator.c b/drivers/power/regulator/s2mps11_regulator.c
index 723d27f67c9a2550c638096d05036ccccce20beb..67d1f9689de38ea50bf3166d0e9fbf0abe39da04 100644 (file)
--- a/drivers/power/regulator/s2mps11_regulator.c
+++ b/drivers/power/regulator/s2mps11_regulator.c
@@ -551,7 +551,16 @@ static int ldo_get_enable(struct udevice *dev)
 
 static int ldo_set_enable(struct udevice *dev, bool enable)
 {
-       return s2mps11_ldo_enable(dev, PMIC_OP_SET, &enable);
+       int ret;
+
+       ret = s2mps11_ldo_enable(dev, PMIC_OP_SET, &enable);
+       if (ret)
+               return ret;
+
+       /* Wait the "enable delay" for voltage to start to rise */
+       udelay(15);
+
+       return 0;
 }
 
 static int ldo_get_mode(struct udevice *dev)