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

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Message-ID: <0b171f2e-4bbc-a54a-7615-87fd4559fee9@somainline.org>
Date:   Thu, 2 Dec 2021 01:00:04 +0100
From:   Konrad Dybcio <konrad.dybcio@...ainline.org>
To:     Stephen Boyd <sboyd@...nel.org>,
        ~postmarketos/upstreaming@...ts.sr.ht
Cc:     martin.botka@...ainline.org,
        angelogioacchino.delregno@...ainline.org,
        marijn.suijten@...ainline.org, jamipkettunen@...ainline.org,
        Andy Gross <agross@...nel.org>,
        Bjorn Andersson <bjorn.andersson@...aro.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 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..


Konrad