linux-kernel - Re: [PATCH 7/7] ARM: dts: exynos: k3g: Add display support

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Message-ID: <b03be798-6fd6-71ea-7546-9f1dab9b65cb@linaro.org>
Date:   Wed, 19 Jul 2023 11:19:34 +0200
From:   Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
To:     Markuss Broks <markuss.broks@...il.com>
Cc:     Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Conor Dooley <conor+dt@...nel.org>,
        Alim Akhtar <alim.akhtar@...sung.com>,
        devicetree@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-samsung-soc@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 7/7] ARM: dts: exynos: k3g: Add display support

On 17/07/2023 00:05, Markuss Broks wrote:
> This device has Samsung S6E3FA2 DSI display installed,

Full stop.

> this adds the device-tree bindings for it but two things

Please do not use "This commit/patch", but imperative mood. See longer
explanation here:
https://elixir.bootlin.com/linux/v5.17.1/source/Documentation/process/submitting-patches.rst#L95

> prevent it from being fully usable: one is a bug in Exynos5
> DSI subsystem, which I believe is not tested properly;

Full stop.

> the bug occurs randomly regardless of any variables, but it
> seems to occur less if the Exynos DRM kernel module is loaded
> later in the kernel boot process (the bug concludes in display
> filling with static) ; another issue is that efforts

Full stop.

> to support the S6E3FA2 panel are still going on, and the driver
> for the panel is not in the kernel tree yet.
> 
> Signed-off-by: Markuss Broks <markuss.broks@...il.com>
> ---
>  arch/arm/boot/dts/exynos5422-samsung-k3g.dts | 41 ++++++++++++++++++++
>  1 file changed, 41 insertions(+)
> 
> diff --git a/arch/arm/boot/dts/exynos5422-samsung-k3g.dts b/arch/arm/boot/dts/exynos5422-samsung-k3g.dts
> index e019b630db94..954de392afbf 100644
> --- a/arch/arm/boot/dts/exynos5422-samsung-k3g.dts
> +++ b/arch/arm/boot/dts/exynos5422-samsung-k3g.dts
> @@ -203,6 +203,42 @@ &cpu4 {
>  	cpu-supply = <&buck6_reg>;
>  };
>  
> +&mixer {
> +	status = "okay";
> +};
> +
> +&fimd {

Mixed order.

> +	status = "okay";
> +	samsung,invert-vclk;
> +};
> +
> +&dsi {
> +	status = "okay";
> +
> +	samsung,pll-clock-frequency = <24000000>;
> +	samsung,burst-clock-frequency = <500000000>;
> +	samsung,esc-clock-frequency = <16000000>;
> +
> +	vddcore-supply = <&ldo8_reg>;
> +	vddio-supply = <&ldo10_reg>;
> +
> +	#address-cells = <1>;
> +	#size-cells = <0>;
> +
> +	panel@0 {
> +		reg = <0>;
> +		compatible = "samsung,s6e3fa2";

Compatible is always the first property. Second is reg.



Best regards,
Krzysztof