mfd: sec-core: Prepare regulators for suspend state to reduce power-consumption

This patch use regulator_suspend_prepare() function to prepare the proper state
of regulators for suspend state to remove un-necessary leakage power-consumption.

Signed-off-by: Chanwoo Choi <cw00.choi@samsung.com>
Signed-off-by: Lee Jones <lee.jones@linaro.org>

2 files changed, 11 insertions, 0 deletions

diff --git a/drivers/mfd/Kconfig b/drivers/mfd/Kconfig
index defe58d65940..b8d9ca0b68e2 100644
--- a/drivers/mfd/Kconfig
+++ b/drivers/mfd/Kconfig
@@ -587,6 +587,7 @@ config MFD_SEC_CORE
         select MFD_CORE
         select REGMAP_I2C
         select REGMAP_IRQ
+        select REGULATOR
         help
          Support for the Samsung Electronics MFD series.
          This driver provides common support for accessing the device,
diff --git a/drivers/mfd/sec-core.c b/drivers/mfd/sec-core.c
index 2621328851ba..fb8ba6438268 100644
--- a/drivers/mfd/sec-core.c
+++ b/drivers/mfd/sec-core.c
@@ -31,6 +31,7 @@
 #include <linux/mfd/samsung/s2mpu02.h>
 #include <linux/mfd/samsung/s5m8763.h>
 #include <linux/mfd/samsung/s5m8767.h>
+#include <linux/regulator/machine.h>
 #include <linux/regmap.h>
 
 static const struct mfd_cell s5m8751_devs[] = {
@@ -430,6 +431,15 @@ static int sec_pmic_suspend(struct device *dev)
          */
         disable_irq(sec_pmic->irq);
 
+        switch (sec_pmic->device_type) {
+        case S2MPS14X:
+        case S2MPU02:
+                regulator_suspend_prepare(PM_SUSPEND_MEM);
+                break;
+        default:
+                break;
+        }
+
         return 0;
 }