overlays: Add an overlay for the Adafruit Kippah with their 7" panel

Signed-off-by: Eric Anholt <eric@anholt.net>

arch/arm/boot/dts/overlays/Makefile

@@ -137,6 +137,7 @@ dtbo-$(CONFIG_ARCH_BCM2835) += \
 	upstream.dtbo \
 	upstream-aux-interrupt.dtbo \
 	vc4-fkms-v3d.dtbo \
+	vc4-kms-kippah-7inch.dtbo \
 	vc4-kms-v3d.dtbo \
 	vga666.dtbo \
 	w1-gpio.dtbo \

arch/arm/boot/dts/overlays/README

@@ -1977,6 +1977,12 @@ Params: cma-256                 CMA is 256MB, 256MB-aligned (needs 1GB)
         cma-64                  CMA is 64MB, 64MB-aligned
 
 
+Name:   vc4-kms-kippah-7inch
+Info:   Enable the Adafruit DPI Kippah with the 7" Ontat panel attached.
+        Requires vc4-kms-v3d to be loaded.
+Load:   dtoverlay=vc4-kms-kippah-7inch
+
+
 Name:   vga666
 Info:   Overlay for the Fen Logic VGA666 board
         This uses GPIOs 2-21 (so no I2C), and activates the output 2-3 seconds

arch/arm/boot/dts/overlays/vc4-kms-kippah-7inch-overlay.dts

@@ -0,0 +1,43 @@
+/*
+ * vc4-kms-v3d-overlay.dts
+ */
+
+/dts-v1/;
+/plugin/;
+
+#include <dt-bindings/pinctrl/bcm2835.h>
+
+/ {
+	compatible = "brcm,bcm2835", "brcm,bcm2708", "brcm,bcm2709";
+
+	fragment@0 {
+		target-path = "/";
+		__overlay__ {
+			panel: panel {
+				compatible = "ontat,yx700wv03", "simple-panel";
+
+				port {
+					panel_in: endpoint {
+						remote-endpoint = <&dpi_out>;
+					};
+				};
+			};
+		};
+	};
+
+	fragment@1 {
+		target = <&dpi>;
+		__overlay__  {
+			status = "okay";
+
+			pinctrl-names = "default";
+			pinctrl-0 = <&dpi_18bit_gpio0>;
+
+			port {
+				dpi_out: endpoint@0 {
+					remote-endpoint = <&panel_in>;
+				};
+			};
+		};
+	};
+};