linux-kernel - Re: [PATCH] dt-bindings: cpufreq: cpufreq-qcom-hw: Document SM8350 CPUfreq compatible

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Message-ID: <20210217044955.qmbpd43wis7xtjoj@vireshk-i7>
Date:   Wed, 17 Feb 2021 10:19:55 +0530
From:   Viresh Kumar <viresh.kumar@...aro.org>
To:     Vinod Koul <vkoul@...nel.org>
Cc:     linux-arm-msm@...r.kernel.org,
        Bjorn Andersson <bjorn.andersson@...aro.org>,
        "Rafael J. Wysocki" <rjw@...ysocki.net>,
        Rob Herring <robh+dt@...nel.org>, linux-pm@...r.kernel.org,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] dt-bindings: cpufreq: cpufreq-qcom-hw: Document SM8350
 CPUfreq compatible

On 16-02-21, 16:42, Vinod Koul wrote:
> Add the CPUfreq compatible for SM8350 SoC along with note for using the
> specific compatible for SoCs
> 
> Signed-off-by: Vinod Koul <vkoul@...nel.org>
> ---
>  Documentation/devicetree/bindings/cpufreq/cpufreq-qcom-hw.txt | 4 +++-
>  1 file changed, 3 insertions(+), 1 deletion(-)
> 
> diff --git a/Documentation/devicetree/bindings/cpufreq/cpufreq-qcom-hw.txt b/Documentation/devicetree/bindings/cpufreq/cpufreq-qcom-hw.txt
> index 9299028ee712..3eb3cee59d79 100644
> --- a/Documentation/devicetree/bindings/cpufreq/cpufreq-qcom-hw.txt
> +++ b/Documentation/devicetree/bindings/cpufreq/cpufreq-qcom-hw.txt
> @@ -8,7 +8,9 @@ Properties:
>  - compatible
>  	Usage:		required
>  	Value type:	<string>
> -	Definition:	must be "qcom,cpufreq-hw" or "qcom,cpufreq-epss".
> +	Definition:	must be "qcom,cpufreq-hw" or "qcom,cpufreq-epss"
> +			along with SoC specific compatible:
> +			  "qcom,sm8350-cpufreq-epss", "qcom,cpufreq-epss"

And why is SoC specific compatible required here ? Is the implementation on
sm8350 any different than the ones using "qcom,cpufreq-epss" compatible ?

FWIW, the same compatible string must be reused until the time there is
difference in the hardware. The compatible string must be considered as a marker
for a particular version of the hardware.

-- 
viresh