linux-kernel - Re: [PATCH 1/3] dt-bindings: i2c: qcom,i2c-qup: Document power-domains

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Message-ID: <170119384299.3558042.16570050685219683863.robh@kernel.org>
Date:   Tue, 28 Nov 2023 11:50:43 -0600
From:   Rob Herring <robh@...nel.org>
To:     Stephan Gerhold <stephan.gerhold@...nkonzept.com>
Cc:     Andy Gross <agross@...nel.org>,
        Konrad Dybcio <konrad.dybcio@...aro.org>,
        linux-arm-msm@...r.kernel.org, Conor Dooley <conor+dt@...nel.org>,
        linux-i2c@...r.kernel.org, Bjorn Andersson <andersson@...nel.org>,
        devicetree@...r.kernel.org, Rob Herring <robh+dt@...nel.org>,
        Andi Shyti <andi.shyti@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Wolfram Sang <wsa@...nel.org>, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/3] dt-bindings: i2c: qcom,i2c-qup: Document
 power-domains


On Tue, 28 Nov 2023 10:48:35 +0100, Stephan Gerhold wrote:
> Similar to qcom,geni-i2c, for i2c-qup we need to vote for performance
> states on the VDDCX power domain to ensure that required clock rates
> can be generated correctly.
> 
> I2C is typically used with a fixed clock rate, so a single required-opp
> is sufficient without a full OPP table (unlike spi-qup for example).
> 
> Signed-off-by: Stephan Gerhold <stephan.gerhold@...nkonzept.com>
> ---
>  Documentation/devicetree/bindings/i2c/qcom,i2c-qup.yaml | 9 +++++++++
>  1 file changed, 9 insertions(+)
> 

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