linux-kernel - [PATCHv8 4/4] mfd: sec-core: Prepare regulators for suspend state to reduce power-consumption

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Date:	Wed, 25 Jun 2014 16:14:47 +0900
From:	Chanwoo Choi <cw00.choi@...sung.com>
To:	lee.jones@...aro.org, sbkim73@...sung.com, sameo@...ux.intel.com,
	broonie@...nel.org
Cc:	myungjoo.ham@...sung.com, kyungmin.park@...sung.com,
	linux-kernel@...r.kernel.org, Chanwoo Choi <cw00.choi@...sung.com>
Subject: [PATCHv8 4/4] 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@...sung.com>
---
 drivers/mfd/Kconfig    |  1 +
 drivers/mfd/sec-core.c | 10 ++++++++++
 2 files changed, 11 insertions(+)

diff --git a/drivers/mfd/Kconfig b/drivers/mfd/Kconfig
index af0e83f..b5898dc 100644
--- a/drivers/mfd/Kconfig
+++ b/drivers/mfd/Kconfig
@@ -586,6 +586,7 @@ 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 2621328..fb8ba64 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;
 }
 
-- 
1.8.0

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