regulator: tps6586x: add SMx slew rate setting

Add output vlotage slew rate setting for SM0/SM1

Signed-off-by: Xin Xie <xxie@nvidia.com>
Signed-off-by: Danny Huang <dahuang@nvidia.com>
Acked-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
Signed-off-by: Liam Girdwood <lrg@slimlogic.co.uk>

diff --git a/drivers/regulator/tps6586x-regulator.c b/drivers/regulator/tps6586x-regulator.c
index bb04a75..dbcf09d 100644 (file)
--- a/drivers/regulator/tps6586x-regulator.c
+++ b/drivers/regulator/tps6586x-regulator.c
@@ -332,6 +332,36 @@ static inline int tps6586x_regulator_preinit(struct device *parent,
                                 1 << ri->enable_bit[1]);
 }
 
+static int tps6586x_regulator_set_slew_rate(struct platform_device *pdev)
+{
+       struct device *parent = pdev->dev.parent;
+       struct regulator_init_data *p = pdev->dev.platform_data;
+       struct tps6586x_settings *setting = p->driver_data;
+       uint8_t reg;
+
+       if (setting == NULL)
+               return 0;
+
+       if (!(setting->slew_rate & TPS6586X_SLEW_RATE_SET))
+               return 0;
+
+       /* only SM0 and SM1 can have the slew rate settings */
+       switch (pdev->id) {
+       case TPS6586X_ID_SM_0:
+               reg = TPS6586X_SM0SL;
+               break;
+       case TPS6586X_ID_SM_1:
+               reg = TPS6586X_SM1SL;
+               break;
+       default:
+               dev_warn(&pdev->dev, "Only SM0/SM1 can set slew rate\n");
+               return -EINVAL;
+       }
+
+       return tps6586x_write(parent, reg,
+                       setting->slew_rate & TPS6586X_SLEW_RATE_MASK);
+}
+
 static inline struct tps6586x_regulator *find_regulator_info(int id)
 {
        struct tps6586x_regulator *ri;
@@ -374,7 +404,7 @@ static int __devinit tps6586x_regulator_probe(struct platform_device *pdev)
 
        platform_set_drvdata(pdev, rdev);
 
-       return 0;
+       return tps6586x_regulator_set_slew_rate(pdev);
 }
 
 static int __devexit tps6586x_regulator_remove(struct platform_device *pdev)

diff --git a/include/linux/mfd/tps6586x.h b/include/linux/mfd/tps6586x.h
index b6bab1b..b19176e 100644 (file)
--- a/include/linux/mfd/tps6586x.h
+++ b/include/linux/mfd/tps6586x.h
@@ -1,6 +1,18 @@
 #ifndef __LINUX_MFD_TPS6586X_H
 #define __LINUX_MFD_TPS6586X_H
 
+#define TPS6586X_SLEW_RATE_INSTANTLY   0x00
+#define TPS6586X_SLEW_RATE_110UV       0x01
+#define TPS6586X_SLEW_RATE_220UV       0x02
+#define TPS6586X_SLEW_RATE_440UV       0x03
+#define TPS6586X_SLEW_RATE_880UV       0x04
+#define TPS6586X_SLEW_RATE_1760UV      0x05
+#define TPS6586X_SLEW_RATE_3520UV      0x06
+#define TPS6586X_SLEW_RATE_7040UV      0x07
+
+#define TPS6586X_SLEW_RATE_SET         0x08
+#define TPS6586X_SLEW_RATE_MASK         0x07
+
 enum {
        TPS6586X_ID_SM_0,
        TPS6586X_ID_SM_1,
@@ -48,6 +60,10 @@ enum {
        TPS6586X_INT_RTC_ALM2,
 };
 
+struct tps6586x_settings {
+       int slew_rate;
+};
+
 struct tps6586x_subdev_info {
        int             id;
        const char      *name;