linux-kernel - Re: [PATCH v6 01/10] dt-bindings: cpufreq: mediatek: Add MediaTek CCI property

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Date:   Wed, 11 May 2022 09:37:53 -0500
From:   Rob Herring <robh@...nel.org>
To:     Rex-BC Chen <rex-bc.chen@...iatek.com>
Cc:     rafael@...nel.org, roger.lu@...iatek.com, krzk+dt@...nel.org,
        robh+dt@...nel.org, hsinyi@...gle.com,
        angelogioacchino.delregno@...labora.com,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        matthias.bgg@...il.com, devicetree@...r.kernel.org,
        linux-mediatek@...ts.infradead.org, khilman@...libre.com,
        jia-wei.chang@...iatek.com,
        Project_Global_Chrome_Upstream_Group@...iatek.com,
        linux-pm@...r.kernel.org, viresh.kumar@...aro.org
Subject: Re: [PATCH v6 01/10] dt-bindings: cpufreq: mediatek: Add MediaTek
 CCI property

On Thu, 05 May 2022 19:52:17 +0800, Rex-BC Chen wrote:
> 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.
> 
> The reason we need the link status between cpufreq and MediaTek cci is
> cpufreq and mediatek cci could share the same regulator in some MediaTek
> SoCs. Therefore, to prevent the issue of high frequency and low voltage,
> we need to use this to make sure mediatek cci is ready.
> 
> Signed-off-by: Rex-BC Chen <rex-bc.chen@...iatek.com>
> Reviewed-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@...labora.com>
> ---
>  .../devicetree/bindings/cpufreq/cpufreq-mediatek.txt       | 7 +++++++
>  1 file changed, 7 insertions(+)
> 

Acked-by: Rob Herring <robh@...nel.org>