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

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Message-ID: <d5148039-e3f4-b9ca-d7e9-19d64ecc1445@samsung.com>
Date:   Fri, 14 Jul 2023 14:28:41 +0900
From:   Jaewon Kim <jaewon02.kim@...sung.com>
To:     Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>,
        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,
        Chanho Park <chanho61.park@...sung.com>
Subject: Re: [PATCH] arm64: dts: exynos: add pwm node for exynosautov9-sadk

Hi Krzysztof


On 23. 7. 14. 14:26, Krzysztof Kozlowski wrote:
> On 14/07/2023 07:15, 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>
>> ---
>>   arch/arm64/boot/dts/exynos/exynosautov9-sadk.dts | 6 ++++++
>>   arch/arm64/boot/dts/exynos/exynosautov9.dtsi     | 9 +++++++++
>>   2 files changed, 15 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..e8860b03fe89 100644
>> --- a/arch/arm64/boot/dts/exynos/exynosautov9.dtsi
>> +++ b/arch/arm64/boot/dts/exynos/exynosautov9.dtsi
>> @@ -1560,6 +1560,15 @@
>>   			samsung,syscon-phandle = <&pmu_system_controller>;
>>   			samsung,cluster-index = <1>;
>>   		};
>> +
>> +		pwm: pwm@...f0000 {
>> +			compatible = "samsung,exynos4210-pwm";
> Thanks for the patch. I think we should change existing practice for
> Samsung SoC and start adding dedicated specific compatible for such
> blocks. It's the same practice we follow in other SoCs. It's also
> recommendation I give to other platforms.
>
> Therefore this should be "samsung,exynosautov9-pwm",
> "samsung,exynos4210-pwm". Feel free to update other DTS as well.

Okay, I will update "samsung,exynosautov9-pwm" compatible in next version.


>
>> +			reg = <0x103f0000 0x100>;
>> +			samsung,pwm-outputs = <0>, <1>, <2>, <3>;
>> +			#pwm-cells = <3>;
>> +			clocks = <&xtcxo>;
> This does not look like correct clock. Are you sure XTCXO goes to PWM?
>
>
>
> Best regards,
> Krzysztof
>
>

Thanks

Jaewon Kim