linux-kernel - Re: [PATCH 11/14] scsi: ufs: host: Add support for parsing OPP

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Message-ID: <20230713052843.GE3047@thinkpad>
Date:   Thu, 13 Jul 2023 10:58:43 +0530
From:   Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>
To:     Viresh Kumar <viresh.kumar@...aro.org>
Cc:     Dmitry Baryshkov <dmitry.baryshkov@...aro.org>, vireshk@...nel.org,
        nm@...com, sboyd@...nel.org, myungjoo.ham@...sung.com,
        kyungmin.park@...sung.com, cw00.choi@...sung.com,
        andersson@...nel.org, konrad.dybcio@...aro.org, robh+dt@...nel.org,
        krzysztof.kozlowski+dt@...aro.org, conor+dt@...nel.org,
        linux-pm@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-arm-msm@...r.kernel.org, devicetree@...r.kernel.org,
        quic_asutoshd@...cinc.com, quic_cang@...cinc.com,
        quic_nitirawa@...cinc.com, quic_narepall@...cinc.com,
        quic_bhaskarv@...cinc.com, quic_richardp@...cinc.com,
        quic_nguyenb@...cinc.com, quic_ziqichen@...cinc.com,
        bmasney@...hat.com, krzysztof.kozlowski@...aro.org
Subject: Re: [PATCH 11/14] scsi: ufs: host: Add support for parsing OPP

On Thu, Jul 13, 2023 at 10:42:35AM +0530, Viresh Kumar wrote:
> On 13-07-23, 10:35, Manivannan Sadhasivam wrote:
> > We can settle with this custom callback for now. If there are drivers in the
> > future trying to do the same (skipping 0 freq) then we can generalize.
> 
> Just for completeness, there isn't much to generalize here apart from
> changing the DT order of clocks. Isn't it ?
> 

Even with changing the order, driver has to know the "interesting" clocks
beforehand. But that varies between platforms (this is a generic driver for
ufshc platforms).

And I do not know if clocks have any dependency between them, atleast not in
Qcom platforms. But not sure about others.

- Mani

> The change require for the OPP core makes sense, I will probably just
> push it anyway.
> 
> -- 
> viresh

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