linux-kernel - Re: [PATCH 1/3] dt-bindings: new binding for Himax HX8357D display panels

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Date:   Sat, 27 Oct 2018 18:10:59 +0200
From:   Noralf Trønnes <noralf@...nnes.org>
To:     Eric Anholt <eric@...olt.net>, dri-devel@...ts.freedesktop.org,
        Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>, devicetree@...r.kernel.org
Cc:     linux-kernel@...r.kernel.org,
        Heiner Kallweit <hkallweit1@...il.com>
Subject: Re: [PATCH 1/3] dt-bindings: new binding for Himax HX8357D display
 panels


Den 24.10.2018 20.43, skrev Eric Anholt:
> This adds a new binding for Himax HX8357D display panels. It includes
> a compatible string for one display (more can be added in the future).
>
> The YX350HV15 panel[1] is found in the Adafruit PiTFT 3.5" Touch
> Screen for Raspberry Pi.
>
> [1] https://learn.adafruit.com/adafruit-pitft-3-dot-5-touch-screen-for-raspberry-pi/downloads
>
> This binding is closely modeled after the ili9341 binding, for a
> similar product from adafruit.  The primary difference is that the
> hx8367d doesn't have a reset line that I can find in the schematics.

Typo s/hx8367d/hx8357d/

The adafruit display has an AXP803 that resets the controller.

Acked-by: Noralf Trønnes <noralf@...nnes.org>

> Signed-off-by: Eric Anholt <eric@...olt.net>
> ---
>   .../bindings/display/himax,hx8357d.txt        | 25 +++++++++++++++++++
>   1 file changed, 25 insertions(+)
>   create mode 100644 Documentation/devicetree/bindings/display/himax,hx8357d.txt
>
> diff --git a/Documentation/devicetree/bindings/display/himax,hx8357d.txt b/Documentation/devicetree/bindings/display/himax,hx8357d.txt
> new file mode 100644
> index 000000000000..48586e570be0
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/display/himax,hx8357d.txt
> @@ -0,0 +1,25 @@
> +Himax HX8357D display panels
> +
> +This binding is for display panels using a Himax HX8357D controller in SPI
> +mode, such as the Adafruit 3.5" TFT for Raspberry Pi.
> +
> +Required properties:
> +- compatible:	"adafruit,yx350hv15", "himax,hx8357d"
> +- dc-gpios:	D/C pin
> +
> +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:
> +	display@0{
> +		compatible = "adafruit,yx350hv15", "himax,hx8357d";
> +		reg = <0>;
> +		spi-max-frequency = <32000000>;
> +		dc-gpios = <&gpio0 25 GPIO_ACTIVE_HIGH>;
> +		rotation = <90>;
> +		backlight = <&backlight>;
> +	};