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SubjectRe: [PATCH v1 1/2] dt-bindings: Add binding for Sitronix ST7735R display panels
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Den 29.11.2017 04.01, skrev David Lechner:
> This adds a new device tree binding for Sitronix ST7735R display panels,
> such as the Adafruit 1.8" TFT.
>
> Signed-off-by: David Lechner <david@lechnology.com>
> ---
> .../bindings/display/sitronix,st7735r.txt | 35 ++++++++++++++++++++++
> 1 file changed, 35 insertions(+)
> create mode 100644 Documentation/devicetree/bindings/display/sitronix,st7735r.txt
>
> diff --git a/Documentation/devicetree/bindings/display/sitronix,st7735r.txt b/Documentation/devicetree/bindings/display/sitronix,st7735r.txt
> new file mode 100644
> index 0000000..bbb8ba6
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/display/sitronix,st7735r.txt
> @@ -0,0 +1,35 @@
> +Sitronix ST7735R display panels
> +
> +This binding is for display panels using a Sitronix ST7735R controller in SPI
> +mode.
> +
> +Required properties:
> +- compatible: "sitronix,st7735r-jd-t18003-t01"
> +- dc-gpios: Display data/command selection (D/CX)
> +- reset-gpios: Reset signal (RSTX)

I'm wondering if this should be optional.

Even though the display needs the reset line to be driven, it doesn't
have to be so by a gpio, I believe you can even get away with just
using a resistor as a reset circuit.

Not terribly important, it's up to you.

Noralf.


> +
> +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.
> +
> +Optional properties:
> +- rotation: panel rotation in degrees counter clockwise (0,90,180,270)
> +- backlight: phandle of the backlight device attached to the panel
> +
> +Example:
> +
> + backlight: backlight {
> + compatible = "gpio-backlight";
> + gpios = <&gpio 44 GPIO_ACTIVE_HIGH>;
> + }
> +
> + ...
> +
> + display@0{
> + compatible = "sitronix,st7735r-jd-t18003-t01";
> + reg = <0>;
> + spi-max-frequency = <32000000>;
> + dc-gpios = <&gpio 43 GPIO_ACTIVE_HIGH>;
> + reset-gpios = <&gpio 80 GPIO_ACTIVE_HIGH>;
> + rotation = <270>;
> + backlight = &backlight;
> + };

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