video: mxsfb: Introduce regulator support

Instead of using a custom binding for retrieving the GPIO that activates the
LCD from devicetree, use a standard regulator.

This approach has the advantage to be more generic.

For example: in the case of a board that has a PMIC supplying the LCD voltage,
the current approach would not work, as it only searches for a GPIO pin.

Signed-off-by: Fabio Estevam <fabio.estevam@freescale.com>
Signed-off-by: Shawn Guo <shawn.guo@linaro.org>

2 files changed, 20 insertions, 2 deletions

diff --git a/arch/arm/boot/dts/imx23-evk.dts b/arch/arm/boot/dts/imx23-evk.dts
index 7880e17e27f5..da0588a04131 100644
--- a/arch/arm/boot/dts/imx23-evk.dts
+++ b/arch/arm/boot/dts/imx23-evk.dts
@@ -59,7 +59,7 @@
                         lcdif@80030000 {
                                 pinctrl-names = "default";
                                 pinctrl-0 = <&lcdif_24bit_pins_a>;
-                                panel-enable-gpios = <&gpio1 18 0>;
+                                lcd-supply = <&reg_lcd_3v3>;
                                 display = <&display>;
                                 status = "okay";
 
@@ -120,6 +120,15 @@
                         regulator-max-microvolt = <3300000>;
                         gpio = <&gpio1 29 0>;
                 };
+
+                reg_lcd_3v3: lcd-3v3 {
+                        compatible = "regulator-fixed";
+                        regulator-name = "lcd-3v3";
+                        regulator-min-microvolt = <3300000>;
+                        regulator-max-microvolt = <3300000>;
+                        gpio = <&gpio1 18 0>;
+                        enable-active-high;
+                };
         };
 
         backlight {
diff --git a/arch/arm/boot/dts/imx28-evk.dts b/arch/arm/boot/dts/imx28-evk.dts
index 2d4ea3bfff4c..3637bf3b1d59 100644
--- a/arch/arm/boot/dts/imx28-evk.dts
+++ b/arch/arm/boot/dts/imx28-evk.dts
@@ -123,7 +123,7 @@
                                 pinctrl-names = "default";
                                 pinctrl-0 = <&lcdif_24bit_pins_a
                                              &lcdif_pins_evk>;
-                                panel-enable-gpios = <&gpio3 30 0>;
+                                lcd-supply = <&reg_lcd_3v3>;
                                 display = <&display>;
                                 status = "okay";
 
@@ -310,6 +310,15 @@
                         gpio = <&gpio3 8 0>;
                         enable-active-high;
                 };
+
+                reg_lcd_3v3: lcd-3v3 {
+                        compatible = "regulator-fixed";
+                        regulator-name = "lcd-3v3";
+                        regulator-min-microvolt = <3300000>;
+                        regulator-max-microvolt = <3300000>;
+                        gpio = <&gpio3 30 0>;
+                        enable-active-high;
+                };
         };
 
         sound {