linux-kernel - Re: [PATCH v2 12/15] arm64: dts: qcom: sm6125: Switch fixed xo

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Message-ID: <zytqzpzkuaqpzyylgyj6jjhbisq674an5s5z522e4hvbbny6ip@2ct5u23kpj46>
Date:   Tue, 18 Jul 2023 23:04:31 +0200
From:   Marijn Suijten <marijn.suijten@...ainline.org>
To:     Konrad Dybcio <konrad.dybcio@...aro.org>
Cc:     Dmitry Baryshkov <dmitry.baryshkov@...aro.org>,
        Andy Gross <agross@...nel.org>,
        Bjorn Andersson <andersson@...nel.org>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Conor Dooley <conor+dt@...nel.org>,
        Michael Turquette <mturquette@...libre.com>,
        Stephen Boyd <sboyd@...nel.org>,
        Rob Clark <robdclark@...il.com>,
        Abhinav Kumar <quic_abhinavk@...cinc.com>,
        Sean Paul <sean@...rly.run>, David Airlie <airlied@...il.com>,
        Daniel Vetter <daniel@...ll.ch>,
        Krishna Manikandan <quic_mkrishn@...cinc.com>,
        Loic Poulain <loic.poulain@...aro.org>,
        Konrad Dybcio <konrad.dybcio@...ainline.org>,
        ~postmarketos/upstreaming@...ts.sr.ht,
        AngeloGioacchino Del Regno 
        <angelogioacchino.delregno@...labora.com>,
        Martin Botka <martin.botka@...ainline.org>,
        Jami Kettunen <jami.kettunen@...ainline.org>,
        linux-arm-msm@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org,
        Krzysztof Kozlowski <krzk@...nel.org>,
        linux-clk@...r.kernel.org, dri-devel@...ts.freedesktop.org,
        freedreno@...ts.freedesktop.org, Lux Aliaga <they@...t.lgbt>
Subject: Re: [PATCH v2 12/15] arm64: dts: qcom: sm6125: Switch fixed xo_board
 clock to RPM XO clock

On 2023-06-29 21:14:47, Konrad Dybcio wrote:
> On 29.06.2023 14:26, Dmitry Baryshkov wrote:
> > On Thu, 29 Jun 2023 at 15:09, Marijn Suijten
> > <marijn.suijten@...ainline.org> wrote:
> >>
> >> On 2023-06-29 13:55:28, Dmitry Baryshkov wrote:
> >>> On 27/06/2023 23:14, Marijn Suijten wrote:
> >>>> We have a working RPM XO clock; no other driver except rpmcc should be
> >>>> parenting directly to the fixed-factor xo_board clock nor should it be
> >>>> reachable by that global name.  Remove the name to that effect, so that
> >>>> every clock relation is explicitly defined in DTS.
> >>>>
> >>>> Reviewed-by: Konrad Dybcio <konrad.dybcio@...aro.org>
> >>>> Signed-off-by: Marijn Suijten <marijn.suijten@...ainline.org>
> >>>> ---
> >>>>   arch/arm64/boot/dts/qcom/sm6125.dtsi | 7 ++++---
> >>>>   1 file changed, 4 insertions(+), 3 deletions(-)
> >>>>
> >>>> diff --git a/arch/arm64/boot/dts/qcom/sm6125.dtsi b/arch/arm64/boot/dts/qcom/sm6125.dtsi
> >>>> index 722dde560bec..edb03508dba3 100644
> >>>> --- a/arch/arm64/boot/dts/qcom/sm6125.dtsi
> >>>> +++ b/arch/arm64/boot/dts/qcom/sm6125.dtsi
> >>>> @@ -22,7 +22,6 @@ xo_board: xo-board {
> >>>>                     compatible = "fixed-clock";
> >>>>                     #clock-cells = <0>;
> >>>>                     clock-frequency = <19200000>;
> >>>> -                   clock-output-names = "xo_board";
> >>>
> >>> Why? I'd say, leave it.
> >>
> >> The exact reason is explained in the commit message.
> > 
> > Usually we do no not kill the xo_board name for the sake of anybody
> > still looking for the old name. Weak argument, I know.
> The only users are (rg -l '"xo_board"' drivers):
> 
> drivers/clk/qcom/mmcc-msm8974.c
> drivers/clk/qcom/a53-pll.c
> drivers/clk/qcom/gcc-msm8974.c
> drivers/clk/qcom/clk-smd-rpm.c
> drivers/clk/qcom/mmcc-msm8996.c
> drivers/clk/qcom/gcc-msm8916.c
> drivers/clk/qcom/gcc-apq8084.c
> drivers/clk/qcom/gcc-msm8996.c
> drivers/clk/qcom/mmcc-apq8084.c
> drivers/clk/qcom/clk-rpmh.c
> drivers/gpu/drm/msm/hdmi/hdmi_phy_8996.c
> 
> This platform only binds clk-smd-rpm, but patch 11 provides a
> direct reference in the DT.

And following a quick check, those occurrences all have
.fw_name="xo",.name="xo_board", allowing the clock to be provided via
DT.  For sm6125, I'd like it to be required like that: all dt-bindings
require an "xo" board where relevant, after all.

- Marijn

> 
> Konrad
> 
> > 
> >>
> >>>
> >>> With that fixed:
> >>
> >> Hence I don't think it makes sense to "fix" this.
> >>
> >> - Marijn
> >>
> >>> Reviewed-by: Dmitry Baryshkov <dmitry.baryshkov@...aro.org>
> > 
> > 
> >