linux-kernel - Re: [RFC/patch 2/2] arm64: boot: dts: qcom: surface duo: add minimal framebuffer

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Date:   Fri, 17 Dec 2021 18:32:22 +0100
From:   Konrad Dybcio <konrad.dybcio@...ainline.org>
To:     Felipe Balbi <balbi@...nel.org>, Andy Gross <agross@...nel.org>,
        Bjorn Andersson <bjorn.andersson@...aro.org>
Cc:     Rob Herring <robh+dt@...nel.org>, linux-arm-msm@...r.kernel.org,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        Felipe Balbi <felipe.balbi@...rosoft.com>
Subject: Re: [RFC/patch 2/2] arm64: boot: dts: qcom: surface duo: add minimal
 framebuffer


On 17.12.2021 13:57, Felipe Balbi wrote:
> From: Felipe Balbi <felipe.balbi@...rosoft.com>
>
> Add a minimal framebuffer device so we can use the display on the
> Surface Duo device.
>
> Signed-off-by: Felipe Balbi <felipe.balbi@...rosoft.com>
> ---
>  .../dts/qcom/sm8150-microsoft-surface-duo.dts | 19 +++++++++++++++++++
>  1 file changed, 19 insertions(+)
>
> diff --git a/arch/arm64/boot/dts/qcom/sm8150-microsoft-surface-duo.dts b/arch/arm64/boot/dts/qcom/sm8150-microsoft-surface-duo.dts
> index a73317e1a824..c629ec115fec 100644
> --- a/arch/arm64/boot/dts/qcom/sm8150-microsoft-surface-duo.dts
> +++ b/arch/arm64/boot/dts/qcom/sm8150-microsoft-surface-duo.dts
> @@ -25,6 +25,17 @@ chosen {
>  		stdout-path = "serial0:115200n8";
>  	};
>  
> +	framebuffer0: framebuffer@...00000 {
> +		compatible = "simple-framebuffer";
> +		reg = <0 0x9c000000 0 0x02400000>;

You can remove the leading 0 in the size cell.



> +		status = "okay";

This line is unnecessary, as it's enabled by default



> +
> +		height = <1800>;
> +		width = <1350>;
> +		stride = <(1350 * 4)>;
> +		format = "a8r8g8b8";
> +	};
> +
>  	vph_pwr: vph-pwr-regulator {
>  		compatible = "regulator-fixed";
>  		regulator-name = "vph_pwr";
> @@ -472,6 +483,14 @@ &pon_resin {
>  	linux,code = <KEY_VOLUMEDOWN>;
>  };
>  
> +&reserved_memory {
> +	splash_region: splash_region@...00000 {
> +		/* We expect the bootloader to fill in the size */

Would it be different than the framebuffer size?



> +		reg = <0x0 0x9c000000 0x0 0x0>;
> +		no-map;
> +	};
> +};
> +
>  &tlmm {
>  	gpio-reserved-ranges = <126 4>;
>  


Konrad