linux-kernel - [PATCH V2] mfd: tps65910: Add support for device sleep

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Message-Id: <1331972954-1880-1-git-send-email-ldewangan@nvidia.com>
Date:	Sat, 17 Mar 2012 13:59:14 +0530
From:	Laxman Dewangan <ldewangan@...dia.com>
To:	lrg@...mlogic.co.uk, broonie@...nsource.wolfsonmicro.com,
	jedu@...mlogic.co.uk, sameo@...ux.intel.com, ldewangan@...dia.com
Cc:	linux-kernel@...r.kernel.org
Subject: [PATCH V2] mfd: tps65910: Add support for device sleep

Adding support for device sleep through the external
input control signal "SLEEP".
Changing the SLEEP signal state can switch the device
into SLEEP and ACTIVE state.
Also adding sleep configuration for different resources
so that they should be keep on during sleep state of
device.

Signed-off-by: Laxman Dewangan <ldewangan@...dia.com>
---
There was a merge conflict on Samuel's for-next tree during patch apply.
I rebased the Samuel's for-next tree and made the changes over that.
Resending patch after rebasing.

 drivers/mfd/tps65910.c       |   62 ++++++++++++++++++++++++++++++++++++++++++
 include/linux/mfd/tps65910.h |   14 +++++++++
 2 files changed, 76 insertions(+), 0 deletions(-)

diff --git a/drivers/mfd/tps65910.c b/drivers/mfd/tps65910.c
index bf2b25e..ae7f47b 100644
--- a/drivers/mfd/tps65910.c
+++ b/drivers/mfd/tps65910.c
@@ -90,6 +90,66 @@ static const struct regmap_config tps65910_regmap_config = {
 	.cache_type = REGCACHE_RBTREE,
 };
 
+static int __init tps65910_sleepinit(struct tps65910 *tps65910,
+		struct tps65910_board *pmic_pdata)
+{
+	struct device *dev = NULL;
+	int ret = 0;
+
+	dev = tps65910->dev;
+
+	if (!pmic_pdata->en_dev_slp)
+		return 0;
+
+	/* enabling SLEEP device state */
+	ret = tps65910_set_bits(tps65910, TPS65910_DEVCTRL,
+				DEVCTRL_DEV_SLP_MASK);
+	if (ret < 0) {
+		dev_err(dev, "set dev_slp failed: %d\n", ret);
+		goto err_sleep_init;
+	}
+
+	/* Return if there is no sleep keepon data. */
+	if (!pmic_pdata->slp_keepon)
+		return 0;
+
+	if (pmic_pdata->slp_keepon->therm_keepon) {
+		ret = tps65910_set_bits(tps65910, TPS65910_SLEEP_KEEP_RES_ON,
+				SLEEP_KEEP_RES_ON_THERM_KEEPON_MASK);
+		if (ret < 0) {
+			dev_err(dev, "set therm_keepon failed: %d\n", ret);
+			goto disable_dev_slp;
+		}
+	}
+
+	if (pmic_pdata->slp_keepon->clkout32k_keepon) {
+		ret = tps65910_set_bits(tps65910, TPS65910_SLEEP_KEEP_RES_ON,
+				SLEEP_KEEP_RES_ON_CLKOUT32K_KEEPON_MASK);
+		if (ret < 0) {
+			dev_err(dev, "set clkout32k_keepon failed: %d\n", ret);
+			goto disable_dev_slp;
+		}
+	}
+
+	if (pmic_pdata->slp_keepon->i2chs_keepon) {
+		ret = tps65910_set_bits(tps65910, TPS65910_SLEEP_KEEP_RES_ON,
+				SLEEP_KEEP_RES_ON_I2CHS_KEEPON_MASK);
+		if (ret < 0) {
+			dev_err(dev, "set i2chs_keepon failed: %d\n", ret);
+			goto disable_dev_slp;
+		}
+	}
+
+	return 0;
+
+disable_dev_slp:
+	tps65910_clear_bits(tps65910, TPS65910_DEVCTRL, DEVCTRL_DEV_SLP_MASK);
+
+err_sleep_init:
+	return ret;
+}
+
+
 static int tps65910_i2c_probe(struct i2c_client *i2c,
 			    const struct i2c_device_id *id)
 {
@@ -140,6 +200,8 @@ static int tps65910_i2c_probe(struct i2c_client *i2c,
 
 	tps65910_irq_init(tps65910, init_data->irq, init_data);
 
+	tps65910_sleepinit(tps65910, pmic_plat_data);
+
 	kfree(init_data);
 	return ret;
 
diff --git a/include/linux/mfd/tps65910.h b/include/linux/mfd/tps65910.h
index 0148c80..62cf778 100644
--- a/include/linux/mfd/tps65910.h
+++ b/include/linux/mfd/tps65910.h
@@ -770,6 +770,18 @@
 /* Max number of TPS65910/11 regulators */
 #define TPS65910_NUM_REGS				13
 
+/*
+ * Sleep keepon data: Maintains the state in sleep mode
+ * @therm_keepon: Keep on the thermal monitoring in sleep state.
+ * @clkout32k_keepon: Keep on the 32KHz clock output in sleep state.
+ * @i2chs_keepon: Keep on high speed internal clock in sleep state.
+ */
+struct tps65910_sleep_keepon_data {
+	unsigned therm_keepon:1;
+	unsigned clkout32k_keepon:1;
+	unsigned i2chs_keepon:1;
+};
+
 /**
  * struct tps65910_board
  * Board platform data may be used to initialize regulators.
@@ -781,6 +793,8 @@ struct tps65910_board {
 	int irq_base;
 	int vmbch_threshold;
 	int vmbch2_threshold;
+	bool en_dev_slp;
+	struct tps65910_sleep_keepon_data *slp_keepon;
 	struct regulator_init_data *tps65910_pmic_init_data[TPS65910_NUM_REGS];
 };
 
-- 
1.7.1.1

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