[PATCH v2 1/2] dt-bindings: panel: Add parallel RGB mode for Ilitek ILI9341 panels

[Josef Lusticky]

ILI9341 supports both SPI input mode and parallel RGB input mode.
This commit adds parallel RGB input mode bindings.

Signed-off-by: Josef Lusticky <josef at lusticky.cz>
---
 .../bindings/display/ilitek,ili9341.txt       | 67 ++++++++++++++++---
 1 file changed, 56 insertions(+), 11 deletions(-)

diff --git a/Documentation/devicetree/bindings/display/ilitek,ili9341.txt b/Documentation/devicetree/bindings/display/ilitek,ili9341.txt
index 169b32e4ee4e..629f38a1d0cd 100644
--- a/Documentation/devicetree/bindings/display/ilitek,ili9341.txt
+++ b/Documentation/devicetree/bindings/display/ilitek,ili9341.txt
@@ -1,27 +1,72 @@
 Ilitek ILI9341 display panels
 
-This binding is for display panels using an Ilitek ILI9341 controller in SPI
-mode.
+This binding is for display panels using an Ilitek ILI9341 controller.
+The display panels are supported in the following graphical input modes:
+- SPI input mode
+	MIPI-DBI Type 3 Option 1 or Option 3 is used to transfer
+	commands and graphical data
+- parallel RGB input mode
+	MIPI-DBI Type 3 Option 1 or Option 3 is used for commands
+	MIPI-DPI 18-bit parallel RGB connection is used to transfer
+	graphical data
 
-Required properties:
-- compatible:	"adafruit,yx240qv29", "ilitek,ili9341"
-- dc-gpios:	D/C pin
-- reset-gpios:	Reset pin
+
+SPI input mode:
 
 The node for this driver must be a child node of a SPI controller, hence
-all mandatory properties described in ../spi/spi-bus.txt must be specified.
+all mandatory properties described in spi/spi-bus.txt must be specified.
+
+Required properties in SPI input mode:
+- compatible:   "adafruit,yx240qv29", "ilitek,ili9341"
+- backlight:    phandle of the backlight device attached to the panel
+
+Optional properties in SPI input mode:
+- rotation:     panel rotation in degrees counter clockwise (0,90,180,270)
+- dc-gpios:     GPIO spec for the D/C pin, see gpio/gpio.txt
+- reset-gpios:  GPIO spec for the reset pin, see gpio/gpio.txt
+
+
+Parallel RGB input mode:
+
+The node for this driver must be a child node of a SPI controller, hence
+all mandatory properties described in spi/spi-bus.txt must be specified.
+
+Required properties in parallel RGB input mode:
+- compatible:   "displaytech,dt024ctft", "ilitek,ili9341"
+- backlight:    phandle of the backlight device attached to the panel
+
+Optional properties in parallel RGB input mode:
+- dc-gpios:     GPIO spec for the D/C pin, see gpio/gpio.txt
+- reset-gpios:  GPIO spec for the reset pin, see gpio/gpio.txt
 
-Optional properties:
-- rotation:	panel rotation in degrees counter clockwise (0,90,180,270)
-- backlight:	phandle of the backlight device attached to the panel
+In parallel RGB input mode,
+the device node can contain one 'port' child node with one child
+'endpoint' node, according to the bindings defined in
+media/video-interfaces.txt. This node should describe panel's video bus.
 
-Example:
+
+Example in SPI input mode:
 	display at 0{
 		compatible = "adafruit,yx240qv29", "ilitek,ili9341";
 		reg = <0>;
 		spi-max-frequency = <32000000>;
 		dc-gpios = <&gpio0 9 GPIO_ACTIVE_HIGH>;
 		reset-gpios = <&gpio0 8 GPIO_ACTIVE_HIGH>;
+		backlight = <&backlight>;
 		rotation = <270>;
+	};
+
+Example in parallel RGB input mode:
+	panel@{
+		compatible = "displaytech,dt024ctft", "ilitek,ili9341";
+		reg = <0>;
+		spi-max-frequency = <32000000>;
+		dc-gpios = <&gpio0 9 GPIO_ACTIVE_HIGH>;
+		reset-gpios = <&gpio0 8 GPIO_ACTIVE_HIGH>;
 		backlight = <&backlight>;
+		port {
+			panel_in: endpoint {
+				remote-endpoint = <&display_out>;
+			};
+		};
 	};
-- 
2.20.1