linux-kernel - Re: [PATCH 04/16] arm64: dts: qcom: sm8350: Specify clock-frequency for arch timer

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Message-ID: <YagQmQzk7GorCUVv@ripper>
Date:   Wed, 1 Dec 2021 16:17:29 -0800
From:   Bjorn Andersson <bjorn.andersson@...aro.org>
To:     Konrad Dybcio <konrad.dybcio@...ainline.org>
Cc:     Stephen Boyd <sboyd@...nel.org>,
        ~postmarketos/upstreaming@...ts.sr.ht, martin.botka@...ainline.org,
        angelogioacchino.delregno@...ainline.org,
        marijn.suijten@...ainline.org, jamipkettunen@...ainline.org,
        Andy Gross <agross@...nel.org>,
        Rob Herring <robh+dt@...nel.org>,
        linux-arm-msm@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH 04/16] arm64: dts: qcom: sm8350: Specify clock-frequency
 for arch timer

On Wed 01 Dec 16:00 PST 2021, Konrad Dybcio wrote:

> 
> On 01.12.2021 21:45, Stephen Boyd wrote:
> > Quoting Konrad Dybcio (2021-11-30 11:59:03)
> >> On 30/11/2021 03:05, Stephen Boyd wrote:
> >>> Quoting Konrad Dybcio (2021-11-13 17:27:43)
> >>>> Arch timer runs at 19.2 MHz. Specify the rate in the timer node.
> >>>>
> >>>> Signed-off-by: Konrad Dybcio <konrad.dybcio@...ainline.org>
> >>>> ---
> >>>>   arch/arm64/boot/dts/qcom/sm8350.dtsi | 1 +
> >>>>   1 file changed, 1 insertion(+)
> >>>>
> >>>> diff --git a/arch/arm64/boot/dts/qcom/sm8350.dtsi b/arch/arm64/boot/dts/qcom/sm8350.dtsi
> >>>> index a30ba3193d84..60866a20a55c 100644
> >>>> --- a/arch/arm64/boot/dts/qcom/sm8350.dtsi
> >>>> +++ b/arch/arm64/boot/dts/qcom/sm8350.dtsi
> >>>> @@ -2484,5 +2484,6 @@ timer {
> >>>>                               <GIC_PPI 14 (GIC_CPU_MASK_SIMPLE(8) | IRQ_TYPE_LEVEL_LOW)>,
> >>>>                               <GIC_PPI 11 (GIC_CPU_MASK_SIMPLE(8) | IRQ_TYPE_LEVEL_LOW)>,
> >>>>                               <GIC_PPI 10 (GIC_CPU_MASK_SIMPLE(8) | IRQ_TYPE_LEVEL_LOW)>;
> >>>> +               clock-frequency = <19200000>;
> >>> Does the firmware not set the frequency properly?
> >> It does on my device on the current firmware version (it wouldn't really 
> >> boot if it didn't, no?),
> >>
> >> but who knows if it always will, or if it always has been..
> >>
> >>
> >> It's present in downstream too, so I reckon it does not hurt to have it 
> >> here too, even
> >>
> >> for completeness-of-describing-the-machine-properly sake.
> >>
> > No. We don't want dts files to have this. The property is only there to
> > workaround bad firmware that doesn't set the frequency. Please drop this
> > patch.
> 
> After looking at it again, I see I was indeed wrong, and so was this patch.
> 
> Sorry, and green light for dropping..
> 

Can you please send me a patch that reverts the change as I merged it
into my -next branch already? Both to simplify for me and to document
why it shouldn't be here for others to refer to in the future.

Thanks,
Bjorn