linux-kernel - Re: [PATCH V2 01/15] dt-bindings: cpufreq: mediatek: Add MediaTek CCI property

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Date:   Fri, 8 Apr 2022 10:10:02 +0200
From:   Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
To:     Rex-BC Chen <rex-bc.chen@...iatek.com>, rafael@...nel.org,
        viresh.kumar@...aro.org, robh+dt@...nel.org, krzk+dt@...nel.org
Cc:     matthias.bgg@...il.com, jia-wei.chang@...iatek.com,
        roger.lu@...iatek.com, hsinyi@...gle.com, linux-pm@...r.kernel.org,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org,
        linux-mediatek@...ts.infradead.org,
        Project_Global_Chrome_Upstream_Group@...iatek.com
Subject: Re: [PATCH V2 01/15] dt-bindings: cpufreq: mediatek: Add MediaTek CCI
 property

On 08/04/2022 06:58, Rex-BC Chen wrote:
> From: Jia-Wei Chang <jia-wei.chang@...iatek.com>
> 
> MediaTek Cache Coherent Interconnect (CCI) uses software devfreq module
> for scaling clock frequency and adjust voltage.
> The phandle could be linked between CPU and MediaTek CCI for some
> MediaTek SoCs, like MT8183 and MT8186.
> Therefore, we add this property in cpufreq-mediatek.txt.
> 
> Signed-off-by: Jia-Wei Chang <jia-wei.chang@...iatek.com>
> Signed-off-by: Rex-BC Chen <rex-bc.chen@...iatek.com>
> ---
>  .../devicetree/bindings/cpufreq/cpufreq-mediatek.txt          | 4 ++++
>  1 file changed, 4 insertions(+)
> 
> diff --git a/Documentation/devicetree/bindings/cpufreq/cpufreq-mediatek.txt b/Documentation/devicetree/bindings/cpufreq/cpufreq-mediatek.txt
> index b8233ec91d3d..d1b3d430c25c 100644
> --- a/Documentation/devicetree/bindings/cpufreq/cpufreq-mediatek.txt
> +++ b/Documentation/devicetree/bindings/cpufreq/cpufreq-mediatek.txt
> @@ -20,6 +20,10 @@ Optional properties:
>  	       Vsram to fit SoC specific needs. When absent, the voltage scaling
>  	       flow is handled by hardware, hence no software "voltage tracking" is
>  	       needed.
> +- cci: MediaTek Cache Coherent Interconnect uses software devfreq module for scaling
> +       clock frequency and adjust voltage.

You need to describe the type. I am a bit confused whether this is a cci
(so cci-control-port property?) or an interconnect (so interconnect
property)... It does not look like a generic property, so you need
vendor prefix.

> +       For details, please refer to
> +       Documentation/devicetree/bindings/devfreq/mtk-cci.yaml

Such file does not exist.


Best regards,
Krzysztof