linux-kernel - Re: [RFC] clk: qcom: common: Detach the power domain at the end of probe

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Date:   Thu, 4 Aug 2022 17:37:48 +0300
From:   Dmitry Baryshkov <dmitry.baryshkov@...aro.org>
To:     Abel Vesa <abel.vesa@...aro.org>
Cc:     Bjorn Andersson <bjorn.andersson@...aro.org>,
        Andy Gross <agross@...nel.org>,
        Konrad Dybcio <konrad.dybcio@...ainline.org>,
        Mike Turquette <mturquette@...libre.com>,
        Stephen Boyd <sboyd@...nel.org>, linux-arm-msm@...r.kernel.org,
        linux-clk@...r.kernel.org,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [RFC] clk: qcom: common: Detach the power domain at the end of probe

On Thu, 4 Aug 2022 at 13:35, Abel Vesa <abel.vesa@...aro.org> wrote:
>
> None of the CCs actually need the PD attached to their device,
> but rather some GDSCs registered by those CCs need that PD as a parent
> in order to propagate power gating and the performance state.
>
> So lets detach the PD from the CC right at the end of probe, after
> everything has been successfully set up.

Would it still be possible to read the clock registers if we detach
the device from the domain?
I think it was the original issue behind putting the dispcc/videocc
into the MMCX domain: to be able to poke into the clock registers,
which are gated by the MMCX.


> Signed-off-by: Abel Vesa <abel.vesa@...aro.org>


-- 
With best wishes
Dmitry