On Tue, Jul 14, 2020 at 03:13:01PM +0800, Chen-Yu Tsai wrote:
> From: Chen-Yu Tsai <wens@xxxxxxxx>
>
> Some LCD panels do not support 24-bit true color, or 8bits per channel
> RGB. Many low end ones only support up to 6 bits per channel natively.
This should be implied by the panel's compatible property.
> Add a device tree property to describe the native bit depth of the
> panel. This is separate from the bus width or format of the connection
> to the display output.
>
> Signed-off-by: Chen-Yu Tsai <wens@xxxxxxxx>
> ---
> .../devicetree/bindings/display/panel/panel-dpi.yaml | 4 ++++
> 1 file changed, 4 insertions(+)
>
> diff --git a/Documentation/devicetree/bindings/display/panel/panel-dpi.yaml b/Documentation/devicetree/bindings/display/panel/panel-dpi.yaml
> index 0cd74c8dab42..8eb013fb1969 100644
> --- a/Documentation/devicetree/bindings/display/panel/panel-dpi.yaml
> +++ b/Documentation/devicetree/bindings/display/panel/panel-dpi.yaml
> @@ -26,6 +26,9 @@ properties:
> height-mm: true
> label: true
> panel-timing: true
> + bits-per-color:
> + description:
> + Shall contain an integer describing the number of bits per color.
> port: true
> power-supply: true
> reset-gpios: true
> @@ -42,6 +45,7 @@ examples:
> panel {
> compatible = "osddisplays,osd057T0559-34ts", "panel-dpi";
> label = "osddisplay";
> + bits-per-color = <8>;
> power-supply = <&vcc_supply>;
> backlight = <&backlight>;
>
> --
> 2.27.0
>
