linux-kernel - Re: [PATCH 11/13] ARM: dts: exynos: Silence SATA PHY warning in Exynos5250 Arndale

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Message-ID: <800d8fa8-7fd4-6221-f8be-ef422e5642d9@samsung.com>
Date:   Tue, 1 Sep 2020 10:13:28 +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:     Bartlomiej Zolnierkiewicz <b.zolnierkie@...sung.com>,
        Sylwester Nawrocki <snawrocki@...nel.org>
Subject: Re: [PATCH 11/13] ARM: dts: exynos: Silence SATA PHY warning in
 Exynos5250 Arndale

Hi Krzysztof,

On 01.09.2020 09:54, Krzysztof Kozlowski wrote:
> The SATA PHY in Exynos5250 SoCs has two interfaces and two device nodes:
> 1. sata-phy@...70000
> 2. i2c-9/i2c@38
>
> The first node represents the actual SATA PHY device with phy-cells.
> The second represents additional I2C interface, needed by the driver
> to communicate with the SATA PHY device.  It is not a PHY-provider in
> the terms of dtschema so rename it to silence dtbs_check warning:
>
>    arch/arm/boot/dts/exynos5250-arndale.dt.yaml: sata-phy@38: '#phy-cells' is a required property
>      From schema: lib/python3.6/site-packages/dtschema/schemas/phy/phy-provider.yaml
>
> Signed-off-by: Krzysztof Kozlowski <krzk@...nel.org>
> ---
>   arch/arm/boot/dts/exynos5250-arndale.dts | 2 +-
>   1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/arch/arm/boot/dts/exynos5250-arndale.dts b/arch/arm/boot/dts/exynos5250-arndale.dts
> index f2bcce167b2d..3c401c82905c 100644
> --- a/arch/arm/boot/dts/exynos5250-arndale.dts
> +++ b/arch/arm/boot/dts/exynos5250-arndale.dts
> @@ -544,7 +544,7 @@
>   	samsung,i2c-max-bus-freq = <40000>;
>   	samsung,i2c-slave-addr = <0x38>;
>   
> -	sata_phy_i2c: sata-phy@38 {
> +	sata_phy_i2c: sata-phy-i2c@38 {
>   		compatible = "samsung,exynos-sataphy-i2c";
>   		reg = <0x38>;
>   	};

I'm not against the rename, but frankly, the above node and all i2c 
parameters should be moved to exynos5250.dtsi. This is a SoC internal 
things (the same way as hdmiphy in exynos4.dtsi), so the board dts 
should only contain information like status = "enabled" for i2c_8 and 
hdmi_i2c_phy nodes. No need to duplicate it here and in smdk5250.dts.

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