linux-kernel - Re: [PATCH v3] arm64: dts: exynos: add pwm node for exynosautov9-sadk

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Date:   Mon, 17 Jul 2023 08:42:14 +0200
From:   Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
To:     Jaewon Kim <jaewon02.kim@...sung.com>,
        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>
Cc:     devicetree@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-samsung-soc@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v3] arm64: dts: exynos: add pwm node for exynosautov9-sadk

On 17/07/2023 08:33, Jaewon Kim wrote:
> Add pwm node to support fan on exynosautov9-sadk board.
> PWM channel 3 of ExynosAutov9 is connected to fan for SoC cooling
> in SADK board.
> 
> Signed-off-by: Jaewon Kim <jaewon02.kim@...sung.com>
> ---
> Changes in v3:
>  - removed adding compatible to driver.
> 
> Changes in v2:
>  - add compatible string to driver.
> ---
>  arch/arm64/boot/dts/exynos/exynosautov9-sadk.dts |  6 ++++++
>  arch/arm64/boot/dts/exynos/exynosautov9.dtsi     | 10 ++++++++++
>  2 files changed, 16 insertions(+)
> 
> diff --git a/arch/arm64/boot/dts/exynos/exynosautov9-sadk.dts b/arch/arm64/boot/dts/exynos/exynosautov9-sadk.dts
> index 898c2fc345ed..e717bb1cad81 100644
> --- a/arch/arm64/boot/dts/exynos/exynosautov9-sadk.dts
> +++ b/arch/arm64/boot/dts/exynos/exynosautov9-sadk.dts
> @@ -50,6 +50,12 @@
>  	};
>  };
>  
> +&pwm {
> +	pinctrl-names = "default";
> +	pinctrl-0 = <&pwm_tout3>;
> +	status = "okay";
> +};
> +
>  &serial_0 {
>  	pinctrl-0 = <&uart0_bus_dual>;
>  	status = "okay";
> diff --git a/arch/arm64/boot/dts/exynos/exynosautov9.dtsi b/arch/arm64/boot/dts/exynos/exynosautov9.dtsi
> index d3c5cdeff47f..3b906f4db907 100644
> --- a/arch/arm64/boot/dts/exynos/exynosautov9.dtsi
> +++ b/arch/arm64/boot/dts/exynos/exynosautov9.dtsi
> @@ -1560,6 +1560,16 @@
>  			samsung,syscon-phandle = <&pmu_system_controller>;
>  			samsung,cluster-index = <1>;
>  		};
> +
> +		pwm: pwm@...f0000 {
> +			compatible = "samsung,exynosautov9-pwm",
> +				     "samsung,exynos4210-pwm";

It does not look like you tested the DTS against bindings. Please run
`make dtbs_check` (see
Documentation/devicetree/bindings/writing-schema.rst or
https://www.linaro.org/blog/tips-and-tricks-for-validating-devicetree-sources-with-the-devicetree-schema/
for instructions).

Full DT schema compliance is a requirement for Samsung (since some time).

Best regards,
Krzysztof