linux-kernel - Re: [PATCH 1/2] dt-bindings: meson: add specific simplefb bindings

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Date:   Thu, 20 Dec 2018 13:52:28 -0600
From:   Rob Herring <robh@...nel.org>
To:     Maxime Jourdan <mjourdan@...libre.com>
Cc:     Kevin Hilman <khilman@...libre.com>,
        Neil Armstrong <narmstrong@...libre.com>,
        linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-amlogic@...ts.infradead.org, devicetree@...r.kernel.org
Subject: Re: [PATCH 1/2] dt-bindings: meson: add specific simplefb bindings

On Mon, Dec 10, 2018 at 10:06:39AM +0100, Maxime Jourdan wrote:
> Similar to simple-framebuffer-sunxi, we support different display pipelines
> that the firmware is free to choose from.
> 
> This documents the "amlogic,simple-framebuffer" compatible and the
> "amlogic,pipeline" extension.
> 
> Signed-off-by: Maxime Jourdan <mjourdan@...libre.com>
> ---
>  .../display/simple-framebuffer-meson.txt      | 33 +++++++++++++++++++
>  1 file changed, 33 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/display/simple-framebuffer-meson.txt
> 
> diff --git a/Documentation/devicetree/bindings/display/simple-framebuffer-meson.txt b/Documentation/devicetree/bindings/display/simple-framebuffer-meson.txt
> new file mode 100644
> index 000000000000..122a5c005cd9
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/display/simple-framebuffer-meson.txt
> @@ -0,0 +1,33 @@
> +Meson specific Simple Framebuffer bindings
> +
> +This binding documents meson specific extensions to the simple-framebuffer
> +bindings. The meson simplefb u-boot code relies on the devicetree containing
> +pre-populated simplefb nodes.
> +
> +These extensions are intended so that u-boot can select the right node based
> +on which pipeline is being used. As such they are solely intended for
> +firmware / bootloader use, and the OS should ignore them.
> +
> +Required properties:
> +- compatible: "amlogic,simple-framebuffer"

And a fallback?

> +- amlogic,pipeline, one of:
> +  "vpu-cvbs"
> +  "vpu-hdmi"
> +
> +Example:
> +
> +chosen {
> +	#address-cells = <2>;
> +	#size-cells = <2>;
> +	ranges;
> +
> +	framebuffer@0 {

Without 'reg', you shouldn't have a unit-address.

> +		compatible = "amlogic,simple-framebuffer",
> +			     "simple-framebuffer";
> +		amlogic,pipeline = "vpu-hdmi";
> +		clocks = <&clkc CLKID_HDMI_PCLK>,
> +			 <&clkc CLKID_CLK81>,
> +			 <&clkc CLKID_GCLK_VENCI_INT0>;
> +		power-domains = <&pwrc_vpu>;
> +	};
> +};
> -- 
> 2.19.2
>