ARM: dts: sun6i: hummingbird-a31: Enable display output through VGA bridge

The Hummingbird A31 board has a VGA DAC which converts RGB output
from the LCD interface to VGA analog signals.

Add nodes for the VGA DAC, its power supply, and enable this part
of the display pipeline.

Signed-off-by: Chen-Yu Tsai <wens@csie.org>
Signed-off-by: Maxime Ripard <maxime.ripard@free-electrons.com>

diff --git a/arch/arm/boot/dts/sun6i-a31-hummingbird.dts b/arch/arm/boot/dts/sun6i-a31-hummingbird.dts
index 4e05160..735914f 100644 (file)
--- a/arch/arm/boot/dts/sun6i-a31-hummingbird.dts
+++ b/arch/arm/boot/dts/sun6i-a31-hummingbird.dts
@@ -63,6 +63,60 @@
                stdout-path = "serial0:115200n8";
        };
 
+       vga-connector {
+               compatible = "vga-connector";
+
+               port {
+                       vga_con_in: endpoint {
+                               remote-endpoint = <&vga_dac_out>;
+                       };
+               };
+       };
+
+       vga-dac {
+               compatible = "dumb-vga-dac";
+               vdd-supply = <&reg_vga_3v3>;
+               #address-cells = <1>;
+               #size-cells = <0>;
+
+               ports {
+                       #address-cells = <1>;
+                       #size-cells = <0>;
+
+                       port@0 {
+                               #address-cells = <1>;
+                               #size-cells = <0>;
+                               reg = <0>;
+
+                               vga_dac_in: endpoint@0 {
+                                       reg = <0>;
+                                       remote-endpoint = <&tcon0_out_vga>;
+                               };
+                       };
+
+                       port@1 {
+                               #address-cells = <1>;
+                               #size-cells = <0>;
+                               reg = <1>;
+
+                               vga_dac_out: endpoint@0 {
+                                       reg = <0>;
+                                       remote-endpoint = <&vga_con_in>;
+                               };
+                       };
+               };
+       };
+
+       reg_vga_3v3: vga_3v3_regulator {
+               compatible = "regulator-fixed";
+               regulator-name = "vga-3v3";
+               regulator-min-microvolt = <3300000>;
+               regulator-max-microvolt = <3300000>;
+               regulator-boot-on;
+               enable-active-high;
+               gpio = <&pio 7 25 GPIO_ACTIVE_HIGH>; /* PH25 */
+       };
+
        wifi_pwrseq: wifi_pwrseq {
                compatible = "mmc-pwrseq-simple";
                reset-gpios = <&pio 6 10 GPIO_ACTIVE_LOW>; /* PG10 */
@@ -258,6 +312,19 @@
        status = "okay";
 };
 
+&tcon0 {
+       pinctrl-names = "default";
+       pinctrl-0 = <&lcd0_rgb888_pins>;
+       status = "okay";
+};
+
+&tcon0_out {
+       tcon0_out_vga: endpoint@0 {
+               reg = <0>;
+               remote-endpoint = <&vga_dac_in>;
+       };
+};
+
 &uart0 {
        pinctrl-names = "default";
        pinctrl-0 = <&uart0_pins_a>;