dt-bindings: Document the Raspberry Pi Touchscreen nodes.
authorEric Anholt <eric@anholt.net>
Wed, 27 Sep 2017 19:36:53 +0000 (12:36 -0700)
committerEric Anholt <eric@anholt.net>
Fri, 6 Oct 2017 19:08:07 +0000 (12:08 -0700)
This doesn't yet cover input, but the driver does get the display
working when the firmware is disabled from talking to our I2C lines.

Signed-off-by: Eric Anholt <eric@anholt.net>
Acked-by: Rob Herring <robh@kernel.org>
Link: https://patchwork.freedesktop.org/patch/msgid/20170927193654.12609-3-eric@anholt.net
Documentation/devicetree/bindings/display/panel/raspberrypi,7inch-touchscreen.txt [new file with mode: 0644]

diff --git a/Documentation/devicetree/bindings/display/panel/raspberrypi,7inch-touchscreen.txt b/Documentation/devicetree/bindings/display/panel/raspberrypi,7inch-touchscreen.txt
new file mode 100644 (file)
index 0000000..e9e19c0
--- /dev/null
@@ -0,0 +1,49 @@
+This binding covers the official 7" (800x480) Raspberry Pi touchscreen
+panel.
+
+This DSI panel contains:
+
+- TC358762 DSI->DPI bridge
+- Atmel microcontroller on I2C for power sequencing the DSI bridge and
+  controlling backlight
+- Touchscreen controller on I2C for touch input
+
+and this binding covers the DSI display parts but not its touch input.
+
+Required properties:
+- compatible:  Must be "raspberrypi,7inch-touchscreen-panel"
+- reg:         Must be "45"
+- port:                See panel-common.txt
+
+Example:
+
+dsi1: dsi@7e700000 {
+       #address-cells = <1>;
+       #size-cells = <0>;
+       <...>
+
+       port {
+               dsi_out_port: endpoint {
+                       remote-endpoint = <&panel_dsi_port>;
+               };
+       };
+};
+
+i2c_dsi: i2c {
+       compatible = "i2c-gpio";
+       #address-cells = <1>;
+       #size-cells = <0>;
+       gpios = <&gpio 28 0
+                &gpio 29 0>;
+
+       lcd@45 {
+               compatible = "raspberrypi,7inch-touchscreen-panel";
+               reg = <0x45>;
+
+               port {
+                       panel_dsi_port: endpoint {
+                               remote-endpoint = <&dsi_out_port>;
+                       };
+               };
+       };
+};