3 files changed, 65 insertions, 0 deletions

diff --git a/Documentation/devicetree/bindings/regulator/tps65090.txt b/Documentation/devicetree/bindings/regulator/tps65090.txt
index 313a60ba61d8..340980239ea9 100644
--- a/Documentation/devicetree/bindings/regulator/tps65090.txt
+++ b/Documentation/devicetree/bindings/regulator/tps65090.txt
@@ -21,6 +21,10 @@ Optional properties:
   number should be provided. If it is externally controlled and no GPIO
   entry then driver will just configure this rails as external control
   and will not provide any enable/disable APIs.
+- ti,overcurrent-wait: This is applicable to FET registers, which have a
+  poorly defined "overcurrent wait" field.  If this property is present it
+  should be between 0 - 3.  If this property isn't present we won't touch the
+  "overcurrent wait" field and we'll leave it to the BIOS/EC to deal with.
 
 Each regulator is defined using the standard binding for regulators.
 
diff --git a/drivers/regulator/tps65090-regulator.c b/drivers/regulator/tps65090-regulator.c
index 2e92ef68574d..ca04e9f010e1 100644
--- a/drivers/regulator/tps65090-regulator.c
+++ b/drivers/regulator/tps65090-regulator.c
@@ -28,15 +28,58 @@
 #include <linux/regulator/of_regulator.h>
 #include <linux/mfd/tps65090.h>
 
+#define CTRL_WT_BIT             2 /* Regulator wait time 0 bit */
+
+#define MAX_OVERCURRENT_WAIT    3 /* Overcurrent wait must be <= this */
+
+/**
+ * struct tps65090_regulator - Per-regulator data for a tps65090 regulator
+ *
+ * @dev: Pointer to our device.
+ * @desc: The struct regulator_desc for the regulator.
+ * @rdev: The struct regulator_dev for the regulator.
+ * @overcurrent_wait_valid: True if overcurrent_wait is valid.
+ * @overcurrent_wait: For FETs, the value to put in the WTFET bitfield.
+ */
+
 struct tps65090_regulator {
         struct device           *dev;
         struct regulator_desc   *desc;
         struct regulator_dev    *rdev;
+        bool                    overcurrent_wait_valid;
+        int                     overcurrent_wait;
 };
 
 static struct regulator_ops tps65090_ext_control_ops = {
 };
 
+/**
+ * tps65090_reg_set_overcurrent_wait - Setup overcurrent wait
+ *
+ * This will set the overcurrent wait time based on what's in the regulator
+ * info.
+ *
+ * @ri:         Overall regulator data
+ * @rdev:       Regulator device
+ *
+ * Return: 0 if no error, non-zero if there was an error writing the register.
+ */
+static int tps65090_reg_set_overcurrent_wait(struct tps65090_regulator *ri,
+                                             struct regulator_dev *rdev)
+{
+        int ret;
+
+        ret = regmap_update_bits(rdev->regmap, rdev->desc->enable_reg,
+                                 MAX_OVERCURRENT_WAIT << CTRL_WT_BIT,
+                                 ri->overcurrent_wait << CTRL_WT_BIT);
+        if (ret) {
+                dev_err(&rdev->dev, "Error updating overcurrent wait %#x\n",
+                        rdev->desc->enable_reg);
+        }
+
+        return ret;
+}
+
 static struct regulator_ops tps65090_reg_contol_ops = {
         .enable         = regulator_enable_regmap,
         .disable        = regulator_disable_regmap,
@@ -209,6 +252,11 @@ static struct tps65090_platform_data *tps65090_parse_dt_reg_data(
                         rpdata->gpio = of_get_named_gpio(np,
                                         "dcdc-ext-control-gpios", 0);
 
+                if (of_property_read_u32(tps65090_matches[idx].of_node,
+                                         "ti,overcurrent-wait",
+                                         &rpdata->overcurrent_wait) == 0)
+                        rpdata->overcurrent_wait_valid = true;
+
                 tps65090_pdata->reg_pdata[idx] = rpdata;
         }
         return tps65090_pdata;
@@ -258,6 +306,8 @@ static int tps65090_regulator_probe(struct platform_device *pdev)
                 ri = &pmic[num];
                 ri->dev = &pdev->dev;
                 ri->desc = &tps65090_regulator_desc[num];
+                ri->overcurrent_wait_valid = tps_pdata->overcurrent_wait_valid;
+                ri->overcurrent_wait = tps_pdata->overcurrent_wait;
 
                 /*
                  * TPS5090 DCDC support the control from external digital input.
@@ -299,6 +349,12 @@ static int tps65090_regulator_probe(struct platform_device *pdev)
                 }
                 ri->rdev = rdev;
 
+                if (ri->overcurrent_wait_valid) {
+                        ret = tps65090_reg_set_overcurrent_wait(ri, rdev);
+                        if (ret < 0)
+                                return ret;
+                }
+
                 /* Enable external control if it is require */
                 if (tps_pdata && is_dcdc(num) && tps_pdata->reg_init_data &&
                                 tps_pdata->enable_ext_control) {
diff --git a/include/linux/mfd/tps65090.h b/include/linux/mfd/tps65090.h
index 3f43069413e7..f25adfa97c73 100644
--- a/include/linux/mfd/tps65090.h
+++ b/include/linux/mfd/tps65090.h
@@ -78,11 +78,16 @@ struct tps65090 {
  *     DCDC1, DCDC2 and DCDC3.
  * @gpio: Gpio number if external control is enabled and controlled through
  *     gpio.
+ * @overcurrent_wait_valid: True if the overcurrent_wait should be applied.
+ * @overcurrent_wait: Value to set as the overcurrent wait time.  This is the
+ *     actual bitfield value, not a time in ms (valid value are 0 - 3).
  */
 struct tps65090_regulator_plat_data {
         struct regulator_init_data *reg_init_data;
         bool enable_ext_control;
         int gpio;
+        bool overcurrent_wait_valid;
+        int overcurrent_wait;
 };
 
 struct tps65090_platform_data {