linux-kernel - [PATCH 08/11] dt-bindings: Document the Raspberry Pi Touchscreen nodes.

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Message-Id: <20161214194621.16499-9-eric@anholt.net>
Date:   Wed, 14 Dec 2016 11:46:18 -0800
From:   Eric Anholt <eric@...olt.net>
To:     Florian Fainelli <f.fainelli@...il.com>,
        Michael Turquette <mturquette@...libre.com>,
        Stephen Boyd <sboyd@...eaurora.org>,
        Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        dri-devel@...ts.freedesktop.org,
        Thierry Reding <thierry.reding@...il.com>
Cc:     linux-rpi-kernel@...ts.infradead.org,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        Stephen Warren <swarren@...dotorg.org>,
        Lee Jones <lee@...nel.org>,
        bcm-kernel-feedback-list@...adcom.com, linux-clk@...r.kernel.org,
        Eric Anholt <eric@...olt.net>
Subject: [PATCH 08/11] dt-bindings: Document the Raspberry Pi Touchscreen nodes.

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@...olt.net>
---
 .../display/panel/raspberrypi,touchscreen.txt      | 45 ++++++++++++++++++++++
 1 file changed, 45 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/display/panel/raspberrypi,touchscreen.txt

diff --git a/Documentation/devicetree/bindings/display/panel/raspberrypi,touchscreen.txt b/Documentation/devicetree/bindings/display/panel/raspberrypi,touchscreen.txt
new file mode 100644
index 000000000000..fd328c52706b
--- /dev/null
+++ b/Documentation/devicetree/bindings/display/panel/raspberrypi,touchscreen.txt
@@ -0,0 +1,45 @@
+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 the binding currently covers the DSI display parts but not its
+touch input.
+
+Required properties:
+- compatible:	Must be "raspberrypi,touchscreen"
+- raspberrypi,touchscreen-bridge:
+		Handle to the I2C device for Atmel microcontroller
+
+Example:
+
+dsi1: dsi@...00000 {
+	#address-cells = <1>;
+	#size-cells = <0>;
+	<...>
+
+	pitouchscreen: panel@0 {
+		compatible = "raspberrypi,touchscreen";
+		reg = <0>;
+
+		raspberrypi,touchscreen-bridge = <&pitouchscreen_bridge>;
+	};
+};
+
+i2c_dsi: i2c {
+	compatible = "i2c-gpio";
+	#address-cells = <1>;
+	#size-cells = <0>;
+	gpios = <&gpio 28 0
+		 &gpio 29 0>;
+
+	pitouchscreen_bridge: bridge@45 {
+		compatible = "raspberrypi,touchscreen-bridge-i2c";
+		reg = <0x45>;
+	};
+};
-- 
2.11.0