linux-kernel - Re: [PATCH] arm64: dts: qcom: sc8280xp: Add lost ranges for timer

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Date:   Mon, 11 Jul 2022 19:28:26 -0700
From:   Bjorn Andersson <bjorn.andersson@...aro.org>
To:     Johan Hovold <johan@...nel.org>
Cc:     Andy Gross <agross@...nel.org>,
        Konrad Dybcio <konrad.dybcio@...ainline.org>,
        Johan Hovold <johan+linaro@...nel.org>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        manivannan.sadhasivam@...aro.org, linux-arm-msm@...r.kernel.org,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] arm64: dts: qcom: sc8280xp: Add lost ranges for timer

On Mon 11 Jul 01:56 PDT 2022, Johan Hovold wrote:

> On Thu, Jul 07, 2022 at 09:08:58AM -0700, Bjorn Andersson wrote:
> > The timer node needs ranges specified to map the 1-cell children to the
> > 2-cell address range used in /soc. This addition never made it into the
> > patch that was posted and merged, so add it now.
> > 
> > Fixes: 152d1faf1e2f ("arm64: dts: qcom: add SC8280XP platform")
> > Signed-off-by: Bjorn Andersson <bjorn.andersson@...aro.org>
> > ---
> >  arch/arm64/boot/dts/qcom/sc8280xp.dtsi | 1 +
> >  1 file changed, 1 insertion(+)
> > 
> > diff --git a/arch/arm64/boot/dts/qcom/sc8280xp.dtsi b/arch/arm64/boot/dts/qcom/sc8280xp.dtsi
> > index 2bdb42c88311..37a4cd6f85b6 100644
> > --- a/arch/arm64/boot/dts/qcom/sc8280xp.dtsi
> > +++ b/arch/arm64/boot/dts/qcom/sc8280xp.dtsi
> > @@ -1667,6 +1667,7 @@ timer@...20000 {
> >  			reg = <0x0 0x17c20000 0x0 0x1000>;
> >  			#address-cells = <1>;
> >  			#size-cells = <1>;
> > +			ranges = <0 0 0 0x20000000>;
> 
> While addressing the current issue, this looks odd to me. Why not use a
> non-zero parent bus address here instead?
> 

I guess we could express the frames relative the timer range, but that
would imply that anyone porting downstream dts snippets would have to
translate these addresses - or more likely would end up just copying the
existing cases.

> And please use hex notation consistently for the addresses.

That seems like a reasonable ask, I can fix that up. But on both
accounts this matches what I merged for all the other platforms in:

458ebdbb8e5d ("arm64: dts: qcom: timer should use only 32-bit size")


So I guess we'll also need to go back and fix up the style of all the
other platforms - just because we're not allowed to express the frames
in 64-bits according to the binding...

Regards,
Bjorn

> 
> >  
> >  			frame@...21000 {
> >  				frame-number = <0>;
> 
> Johan