regulator: fixed: Add support to handle enable-active-high DT property

Add support to handle enable-active-high DT property. This property is
used to drive the gpio controlling fixed regulator as active high when
claiming gpio line.
Signed-off-by: NVignesh R <vigneshr@ti.com>
Acked-by: NSimon Glass <sjg@chromium.org>

doc/device-tree-bindings/regulator/fixed.txt

@@ -12,6 +12,9 @@ Optional properties:
 - gpio: GPIO to use for enable control
 - startup-delay-us: startup time in microseconds
 - regulator constraints (binding info: regulator.txt)
+- enable-active-high: Polarity of GPIO is Active high. If this property
+  is missing, the default assumed is Active low.
+
 
 Other kernel-style properties, are currently not used.
 
@@ -36,4 +39,5 @@ fixed_regulator@0 {
 	regulator-max-microamp = <15000>;
 	regulator-always-on;
 	regulator-boot-on;
+	enable-active-high;
 };

drivers/power/regulator/fixed.c

@@ -27,6 +27,8 @@ static int fixed_regulator_ofdata_to_platdata(struct udevice *dev)
 	struct dm_regulator_uclass_platdata *uc_pdata;
 	struct fixed_regulator_platdata *dev_pdata;
 	struct gpio_desc *gpio;
+	const void *blob = gd->fdt_blob;
+	int node = dev->of_offset, flags = GPIOD_IS_OUT;
 	int ret;
 
 	dev_pdata = dev_get_platdata(dev);
@@ -37,9 +39,12 @@ static int fixed_regulator_ofdata_to_platdata(struct udevice *dev)
 	/* Set type to fixed */
 	uc_pdata->type = REGULATOR_TYPE_FIXED;
 
+	if (fdtdec_get_bool(blob, node, "enable-active-high"))
+		flags |= GPIOD_IS_OUT_ACTIVE;
+
 	/* Get fixed regulator optional enable GPIO desc */
 	gpio = &dev_pdata->gpio;
-	ret = gpio_request_by_name(dev, "gpio", 0, gpio, GPIOD_IS_OUT);
+	ret = gpio_request_by_name(dev, "gpio", 0, gpio, flags);
 	if (ret) {
 		debug("Fixed regulator optional enable GPIO - not found! Error: %d\n",
 		      ret);