linux-kernel - Re: [PATCH v2 1/3] ARM: dts: exynos: Add assigned clock parent to CMU in Exynos3250

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Message-ID: <4bc2ea2e-65a2-6c0b-9557-5777e359241a@samsung.com>
Date:   Fri, 4 Sep 2020 08:47:10 +0200
From:   Marek Szyprowski <m.szyprowski@...sung.com>
To:     Krzysztof Kozlowski <krzk@...nel.org>,
        Rob Herring <robh+dt@...nel.org>,
        Kukjin Kim <kgene@...nel.org>, devicetree@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org,
        linux-samsung-soc@...r.kernel.org, linux-kernel@...r.kernel.org
Cc:     Sylwester Nawrocki <snawrocki@...nel.org>
Subject: Re: [PATCH v2 1/3] ARM: dts: exynos: Add assigned clock parent to
 CMU in Exynos3250

Hi Krzysztof,

On 03.09.2020 20:14, Krzysztof Kozlowski wrote:
> Commit 52005dece527 ("ARM: dts: Add assigned clock parents to CMU node
> for exynos3250") added assigned clocks under Clock Management Unit to
> fix hangs when accessing ISP registers.
>
> However the dtschema expects "clocks" property if "assigned-clocks" are
> used.  Add reference to input clock, the parent used in
> "assigned-clock-parents" to silence the dtschema warnings:
>
>    arch/arm/boot/dts/exynos3250-artik5-eval.dt.yaml: clock-controller@...30000: 'clocks' is a dependency of 'assigned-clocks'
>
> Signed-off-by: Krzysztof Kozlowski <krzk@...nel.org>
>
> ---
>
> Changes since v1:
> 1. Add clocks property.
>
> This is a v2 for:
> https://lore.kernel.org/linux-samsung-soc/20200901101534.GE23793@kozik-lap/T/#me85ac382b847dadbc3f6ebf30e94e70b5df1ebb6
> ---
>   arch/arm/boot/dts/exynos3250.dtsi | 1 +
>   1 file changed, 1 insertion(+)
>
> diff --git a/arch/arm/boot/dts/exynos3250.dtsi b/arch/arm/boot/dts/exynos3250.dtsi
> index a1e93fb7f694..89b160280469 100644
> --- a/arch/arm/boot/dts/exynos3250.dtsi
> +++ b/arch/arm/boot/dts/exynos3250.dtsi
> @@ -214,6 +214,7 @@
>   			compatible = "samsung,exynos3250-cmu";
>   			reg = <0x10030000 0x20000>;
>   			#clock-cells = <1>;
> +			clocks = <&cmu CLK_FIN_PLL>;

This is not a correct input clock for this CMU. Please assign it to 
xusbxti, xxti or xtcxo in the respective board dts, as this is a board 
property.

>   			assigned-clocks = <&cmu CLK_MOUT_ACLK_400_MCUISP_SUB>,
>   					  <&cmu CLK_MOUT_ACLK_266_SUB>;
>   			assigned-clock-parents = <&cmu CLK_FIN_PLL>,

Best regards
-- 
Marek Szyprowski, PhD
Samsung R&D Institute Poland