linux-kernel - Re: [PATCH 4/5] i2c: qcom-cci: Add OPP table support and enforce FAST

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Message-ID: <d37765f8-2cef-4c15-8423-b82a0fba3b54@oss.qualcomm.com>
Date: Wed, 10 Sep 2025 16:27:23 +0530
From: Mukesh Savaliya <mukesh.savaliya@....qualcomm.com>
To: Konrad Dybcio <konradybcio@...nel.org>,
        Bjorn Andersson <andersson@...nel.org>, Rob Herring <robh@...nel.org>,
        Krzysztof Kozlowski <krzk+dt@...nel.org>,
        Conor Dooley
 <conor+dt@...nel.org>,
        Bryan O'Donoghue <bryan.odonoghue@...aro.org>,
        Loic Poulain <loic.poulain@....qualcomm.com>,
        Robert Foss
 <rfoss@...nel.org>, Andi Shyti <andi.shyti@...nel.org>
Cc: Marijn Suijten <marijn.suijten@...ainline.org>,
        linux-arm-msm@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-i2c@...r.kernel.org,
        Konrad Dybcio <konrad.dybcio@....qualcomm.com>
Subject: Re: [PATCH 4/5] i2c: qcom-cci: Add OPP table support and enforce
 FAST_PLUS requirements



On 9/4/2025 8:01 PM, Konrad Dybcio wrote:
> From: Konrad Dybcio <konrad.dybcio@....qualcomm.com>
> 
> The CCI clock has voltage requirements, which need to be described
> through an OPP table.
> 
> The 1 MHz FAST_PLUS mode requires the CCI core clock runs at 37,5 MHz
Typo: 37.5 MHz> (which is a value common across all SoCs), since it's 
not possible to
> reach the required timings with the default 19.2 MHz rate.
> 
> Address both issues by introducing an OPP table and using it to vote
> for the faster rate.
> 
> Signed-off-by: Konrad Dybcio <konrad.dybcio@....qualcomm.com>
> ---
[...]