driver:regulator: tps6591x: sleep mode support

Adding controls for the following items
1. PMU SLEEP state enable/disable
2. Keep 32KHz clock out on sleep mode
3. Keep thermal monitor on sleep mode
4. Keep LDO full load capability on sleep mode
5. Keep high speed internal clock on sleep mode
3. Turn off power rails on sleep mode

Original-Change-Id: I389bca4a4d7ff9ae264727af8e93dcec796d3c0c
Reviewed-on: http://git-master/r/32222
Reviewed-by: Scott Williams <scwilliams@nvidia.com>
Tested-by: Chih-Lung Huang <lhuang@nvidia.com>
Reviewed-by: Laxman Dewangan <ldewangan@nvidia.com>

Rebase-Id: Rfbbb34a9983cb69103333e1bb7d13cf6a6bedda6

1 files changed, 83 insertions, 1 deletions

diff --git a/drivers/mfd/tps6591x.c b/drivers/mfd/tps6591x.c
index ddd28bab210f..f317732ade1d 100644
--- a/drivers/mfd/tps6591x.c
+++ b/drivers/mfd/tps6591x.c
@@ -37,8 +37,16 @@
 #define TPS6591X_DEVCTRL	0x3F
 #define DEVCTRL_PWR_OFF_SEQ	(1 << 7)
 #define DEVCTRL_DEV_ON		(1 << 2)
+#define DEVCTRL_DEV_SLP		(1 << 1)
 #define TPS6591X_DEVCTRL2	0x40
 
+/* device sleep on registers */
+#define TPS6591X_SLEEP_KEEP_ON	0x42
+#define SLEEP_KEEP_ON_THERM	(1 << 7)
+#define SLEEP_KEEP_ON_CLKOUT32K	(1 << 6)
+#define SLEEP_KEEP_ON_VRTC	(1 << 5)
+#define SLEEP_KEEP_ON_I2CHS	(1 << 4)
+
 /* interrupt status registers */
 #define TPS6591X_INT_STS	0x50
 #define TPS6591X_INT_STS2	0x52
@@ -291,7 +299,7 @@ static int tps6591x_gpio_get(struct gpio_chip *gc, unsigned offset)
 	if (val & 0x4)
 		return val & 0x1;
 	else
-		return ((val & 0x2)? 1: 0);
+		return (val & 0x2) ? 1 : 0;
 }
 
 static void tps6591x_gpio_set(struct gpio_chip *chip, unsigned offset,
@@ -607,6 +615,78 @@ static void __init tps6591x_debuginit(struct tps6591x *tpsi)
 }
 #endif
 
+static int __init tps6591x_sleepinit(struct tps6591x *tpsi,
+					struct tps6591x_platform_data *pdata)
+{
+	struct device *dev = NULL;
+	int ret = 0;
+
+	dev = tpsi->dev;
+
+	if (!pdata->dev_slp_en)
+		goto no_err_return;
+
+	/* pmu dev_slp_en is set. Make sure slp_keepon is available before
+	 * allowing SLEEP device state */
+	if (!pdata->slp_keepon) {
+		dev_err(dev, "slp_keepon_data required for slp_en\n");
+		goto err_sleep_init;
+	}
+
+	/* enabling SLEEP device state */
+	ret = tps6591x_set_bits(dev, TPS6591X_DEVCTRL, DEVCTRL_DEV_SLP);
+	if (ret < 0) {
+		dev_err(dev, "set dev_slp failed: %d\n", ret);
+		goto err_sleep_init;
+	}
+
+	if (pdata->slp_keepon->therm_keepon) {
+		ret = tps6591x_set_bits(dev, TPS6591X_SLEEP_KEEP_ON,
+						SLEEP_KEEP_ON_THERM);
+		if (ret < 0) {
+			dev_err(dev, "set therm_keepon failed: %d\n", ret);
+			goto disable_dev_slp;
+		}
+	}
+
+	if (pdata->slp_keepon->clkout32k_keepon) {
+		ret = tps6591x_set_bits(dev, TPS6591X_SLEEP_KEEP_ON,
+						SLEEP_KEEP_ON_CLKOUT32K);
+		if (ret < 0) {
+			dev_err(dev, "set clkout32k_keepon failed: %d\n", ret);
+			goto disable_dev_slp;
+		}
+	}
+
+
+	if (pdata->slp_keepon->vrtc_keepon) {
+		ret = tps6591x_set_bits(dev, TPS6591X_SLEEP_KEEP_ON,
+						SLEEP_KEEP_ON_VRTC);
+		if (ret < 0) {
+			dev_err(dev, "set vrtc_keepon failed: %d\n", ret);
+			goto disable_dev_slp;
+		}
+	}
+
+	if (pdata->slp_keepon->i2chs_keepon) {
+		ret = tps6591x_set_bits(dev, TPS6591X_SLEEP_KEEP_ON,
+						SLEEP_KEEP_ON_I2CHS);
+		if (ret < 0) {
+			dev_err(dev, "set i2chs_keepon failed: %d\n", ret);
+			goto disable_dev_slp;
+		}
+	}
+
+no_err_return:
+	return 0;
+
+disable_dev_slp:
+	tps6591x_clr_bits(dev, TPS6591X_DEVCTRL, DEVCTRL_DEV_SLP);
+
+err_sleep_init:
+	return ret;
+}
+
 static int __devinit tps6591x_i2c_probe(struct i2c_client *client,
 					const struct i2c_device_id *id)
 {
@@ -657,6 +737,8 @@ static int __devinit tps6591x_i2c_probe(struct i2c_client *client,
 
 	tps6591x_debuginit(tps6591x);
 
+	tps6591x_sleepinit(tps6591x, pdata);
+
 	tps6591x_i2c_client = client;
 
 	return 0;