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

[Fenglin Wu]

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@xxxxxxxxxx> wrote:
> > > > > From: Fenglin Wu <quic_fenglinw@xxxxxxxxxxx>
> > > > >
> > > > > 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@1800000:
> > > > >           '#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@xxxxxxxxx/
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?

> Regards,
> Robert
>
> > Konrad