linux-kernel - Re: [PATCH] arm64: dts: qcom: sm8150: add reset name for ethernet node

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Date: Thu, 7 Mar 2024 13:03:08 +0530
From: Sumit Garg <sumit.garg@...aro.org>
To: Dmitry Baryshkov <dmitry.baryshkov@...aro.org>
Cc: Volodymyr Babchuk <Volodymyr_Babchuk@...m.com>, Bjorn Andersson <andersson@...nel.org>, 
	Konrad Dybcio <konrad.dybcio@...aro.org>, Rob Herring <robh+dt@...nel.org>, 
	Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>, Conor Dooley <conor+dt@...nel.org>, 
	"linux-arm-msm@...r.kernel.org" <linux-arm-msm@...r.kernel.org>, 
	"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>, 
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] arm64: dts: qcom: sm8150: add reset name for ethernet node

On Thu, 7 Mar 2024 at 12:40, Dmitry Baryshkov
<dmitry.baryshkov@...aro.org> wrote:
>
> On Thu, 7 Mar 2024 at 00:22, Volodymyr Babchuk
> <Volodymyr_Babchuk@...m.com> wrote:
> >
> > Add reset-names property to the ethernet@...00 node. This patch does
> > not change behavior on Linux, but it is needed for U-Boot, as it tries
> > to find the reset by name, not by index.
> >
> > Signed-off-by: Volodymyr Babchuk <volodymyr_babchuk@...m.com>
> > ---
> >  arch/arm64/boot/dts/qcom/sm8150.dtsi | 1 +
> >  1 file changed, 1 insertion(+)
> >
> > diff --git a/arch/arm64/boot/dts/qcom/sm8150.dtsi b/arch/arm64/boot/dts/qcom/sm8150.dtsi
> > index 761a6757dc26f..c2e65d6a2ac62 100644
> > --- a/arch/arm64/boot/dts/qcom/sm8150.dtsi
> > +++ b/arch/arm64/boot/dts/qcom/sm8150.dtsi
> > @@ -951,6 +951,7 @@ ethernet: ethernet@...00 {
> >
> >                         power-domains = <&gcc EMAC_GDSC>;
> >                         resets = <&gcc GCC_EMAC_BCR>;
> > +                       resets-names = "emac";
>
> According to the snps,dwmac.yaml schema the "emac" is invalid here.
> Only "stmmaceth" and / or "ahb" are permitted here.

Okay, it looks like earlier the Linux kernel on Qcom SoCs always
assumed that the EMAC reset signal is deserted by prior boot stages.
So I suppose we can reuse "stmmaceth" here instead of "emac" with a
corresponding change to U-Boot driver as well.

-Sumit

>
> >
> >                         iommus = <&apps_smmu 0x3c0 0x0>;
> >
> > --
> > 2.43.0
> >
>
>
> --
> With best wishes
> Dmitry