linux-kernel - Re: [RFC PATCH 6/6] arm64: dts: qcom: sc7180: Add SoC specific compatible to soc node

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Message-ID: <n3fn5mnrrinrgrvadqgymv3cx355qpx5kk27nlrz2emoxfmjyt@ymwpfxf7lv4r>
Date: Wed, 8 Jan 2025 15:02:12 +0200
From: Dmitry Baryshkov <dmitry.baryshkov@...aro.org>
To: Stephen Boyd <swboyd@...omium.org>
Cc: Bjorn Andersson <andersson@...nel.org>, 
	Konrad Dybcio <konradybcio@...nel.org>, linux-kernel@...r.kernel.org, patches@...ts.linux.dev, 
	devicetree@...r.kernel.org, Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>, 
	Rob Herring <robh@...nel.org>, linux-arm-msm@...r.kernel.org, 
	linux-arm-kernel@...ts.infradead.org, Arnd Bergmann <arnd@...db.de>, 
	Conor Dooley <conor+dt@...nel.org>, Saravana Kannan <saravanak@...gle.com>, 
	Uwe Kleine-König <u.kleine-koenig@...libre.com>
Subject: Re: [RFC PATCH 6/6] arm64: dts: qcom: sc7180: Add SoC specific
 compatible to soc node

On Tue, Jan 07, 2025 at 05:28:43PM -0800, Stephen Boyd wrote:
> Allow an SoC driver to probe for these devices. Add the SoC specific
> compatible to the soc node. Leave the original simple-bus compatible in
> place so that everything keeps working.
> 
> Cc: Rob Herring <robh@...nel.org>
> Cc: Bjorn Andersson <andersson@...nel.org>
> Cc: Konrad Dybcio <konradybcio@...nel.org>
> Cc: <linux-arm-msm@...r.kernel.org>
> Signed-off-by: Stephen Boyd <swboyd@...omium.org>
> ---
>  arch/arm64/boot/dts/qcom/sc7180.dtsi | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/arch/arm64/boot/dts/qcom/sc7180.dtsi b/arch/arm64/boot/dts/qcom/sc7180.dtsi
> index 76fe314d2ad5..257890a193e6 100644
> --- a/arch/arm64/boot/dts/qcom/sc7180.dtsi
> +++ b/arch/arm64/boot/dts/qcom/sc7180.dtsi
> @@ -782,7 +782,7 @@ soc: soc@0 {
>  		#size-cells = <2>;
>  		ranges = <0 0 0 0 0x10 0>;
>  		dma-ranges = <0 0 0 0 0x10 0>;
> -		compatible = "simple-bus";
> +		compatible = "qcom,soc-sc7180", "simple-bus";

If the new driver requires this compatible, it will break compatibility
with older DT files (and it should be avoided).

>  
>  		gcc: clock-controller@...000 {
>  			compatible = "qcom,gcc-sc7180";
> -- 
> https://chromeos.dev
> 

-- 
With best wishes
Dmitry