linux-kernel - Re: [PATCH] arm64: dts: qcom: ipq6018: add #power-domain-cells for gcc node

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Message-ID: <CAA8EJpoAA7RyD=9JZ9aYLMhyvCMWLVr1yhe7NSryRe=VjfmZPw@mail.gmail.com>
Date: Thu, 4 Jan 2024 12:49:44 +0200
From: Dmitry Baryshkov <dmitry.baryshkov@...aro.org>
To: Fenglin Wu <quic_fenglinw@...cinc.com>
Cc: Robert Marko <robimarko@...il.com>, Konrad Dybcio <konrad.dybcio@...aro.org>, quic_tdas@...cinc.com, 
	quic_aiquny@...cinc.com, kernel@...cinc.com, 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>, 
	linux-arm-msm@...r.kernel.org, devicetree@...r.kernel.org, 
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] arm64: dts: qcom: ipq6018: add #power-domain-cells for
 gcc node

On Thu, 4 Jan 2024 at 12:41, Fenglin Wu <quic_fenglinw@...cinc.com> wrote:
>
>
>
> On 1/4/2024 6:32 PM, Robert Marko wrote:
> >
> > On 04. 01. 2024. 11:16, Konrad Dybcio wrote:
> >> On 4.01.2024 11:13, Fenglin Wu wrote:
> >>>
> >>> On 1/4/2024 5:53 PM, Dmitry Baryshkov wrote:
> >>>> On Thu, 4 Jan 2024 at 10:06, Fenglin Wu via B4 Relay
> >>>> <devnull+quic_fenglinw.quicinc.com@...nel.org> wrote:
> >>>>> From: Fenglin Wu <quic_fenglinw@...cinc.com>
> >>>>>
> >>>>> Property '#power-domain-cells' is required as per defined in
> >>>>> qcom,gcc.yaml
> >>>>> so add it for ipq6018 gcc device node to eliminate following
> >>>>> warning in
> >>>>> dtbs_check:
> >>>>>
> >>>>> arch/arm64/boot/dts/qcom/ipq6018-cp01-c1.dtb: gcc@...0000:
> >>>>>           '#power-domain-cells' is a required property
> >>>>> from schema $id:
> >>>>> http://devicetree.org/schemas/clock/qcom,gcc-ipq6018.yaml#
> >>>> But ipq6018 doesn't implement GDSC support. So for the sake of fixing
> >>>> the warning you are adding a bogus property.
> >>>>
> >>> I agree. However, there are also some gcc drivers not implementing
> >>> GDSC support but the bindings are adding '#power-domain-cells' in the
> >>> DT example, such as: qcom,gcc-apq8064.yaml, qcom,gcc-ipq4019.yaml,
> >>> qcom,gcc-ipq6018.yaml, qcom,gcc-ipq8064.yaml, qcom,gcc-msm8660.yaml.
> >>>
> >>> Actually I thought that maybe we should do a clean up by removing
> >>> '#power-domain-cells' out of the qcom,gcc.yaml binding and only
> >>> adding it into individual qcom,gcc-xxx.yaml for the driver which has
> >>> implemented GDSC support. I checked this with Taniya offline, but she
> >>> prefers only fixing it in ipq6018.dtsi as it doesn't hurt anything by
> >>> adding the property, and she expects the GDSC support should be
> >>> existing in most of qcom,gcc drivers especially the newer Qcom chipsets.
> >> Before we start changing anything, we should assess whether these
> >> platforms actually have GDSCs within this clock controller block,
> >> even if they are (currently) not described in the clk driver.
> > Hi,
> > IPQ6018 has GDSC-s, at least for the USB-s.
> > I tried configuring them a while ago, but the USB2.0 GDSC seems to
> > either have a HW bug or
> > it uses some special configuration as its status bits never show that
> > its ON [1].
> >
> > [1]
> > https://patchwork.kernel.org/project/linux-arm-msm/patch/20231025104457.628109-2-robimarko@gmail.com/
> >
> Thanks for the link! I checked the spec internal, and I did see GDSC
> device for USB0/USB1 controller is present in GCC clock controller.
> So considering there is a patch ongoing to add GDSC device for ipq6018
> gcc driver, can the DT commit which adds '#power-domain-cells' be accepted?

What for?

-- 
With best wishes
Dmitry