linux-kernel - Re: [PATCH v4 2/2] arm64: dts: sc7180: Add required-opps for i2c

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Message-ID: <CAE-0n51y2JEy-singr5i9gFFO4uGJ_UVDFChNPUwnTEBO=5kQg@mail.gmail.com>
Date:   Fri, 16 Jul 2021 21:39:16 +0200
From:   Stephen Boyd <swboyd@...omium.org>
To:     Rajendra Nayak <rnayak@...eaurora.org>, bjorn.andersson@...aro.org,
        ulf.hansson@...aro.org, viresh.kumar@...aro.org
Cc:     linux-pm@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-arm-msm@...r.kernel.org,
        rojay@...eaurora.org, stephan@...hold.net
Subject: Re: [PATCH v4 2/2] arm64: dts: sc7180: Add required-opps for i2c

Quoting Rajendra Nayak (2021-07-16 03:00:58)
> qup-i2c devices on sc7180 are clocked with a fixed clock (19.2 MHz)
> Though qup-i2c does not support DVFS, it still needs to vote for a
> performance state on 'CX' to satisfy the 19.2 Mhz clock frequency
> requirement.
>
> Use 'required-opps' to pass this information from
> device tree, and also add the power-domains property to specify
> the CX power-domain.
>
> Signed-off-by: Rajendra Nayak <rnayak@...eaurora.org>
> ---

Reviewed-by: Stephen Boyd <swboyd@...omium.org>