From mboxrd@z Thu Jan 1 00:00:00 1970 From: eric@anholt.net (Eric Anholt) Date: Wed, 14 Dec 2016 11:46:18 -0800 Subject: [PATCH 08/11] dt-bindings: Document the Raspberry Pi Touchscreen nodes. In-Reply-To: <20161214194621.16499-1-eric@anholt.net> References: <20161214194621.16499-1-eric@anholt.net> Message-ID: <20161214194621.16499-9-eric@anholt.net> To: linux-arm-kernel@lists.infradead.org List-Id: linux-arm-kernel.lists.infradead.org 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 --- .../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 at 7e700000 { + #address-cells = <1>; + #size-cells = <0>; + <...> + + pitouchscreen: panel at 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 at 45 { + compatible = "raspberrypi,touchscreen-bridge-i2c"; + reg = <0x45>; + }; +}; -- 2.11.0