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

[Rob Herring <robh@kernel.org>]

On Mon, Jul 08, 2019 at 04:56:17PM +0200, Josef Lusticky wrote:
> 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@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

Why is backlight now required?

> +
> +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@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
> 
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