linux-kernel - Re: [RFC PATCH v2 1/3] dt-bindings: phy: qcom,qmp-usb3-dp: Add sm6350 compatible

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Date:   Fri, 25 Nov 2022 11:19:13 +0100
From:   Johan Hovold <johan@...nel.org>
To:     Luca Weiss <luca.weiss@...rphone.com>
Cc:     linux-arm-msm@...r.kernel.org,
        ~postmarketos/upstreaming@...ts.sr.ht, phone-devel@...r.kernel.org,
        Andy Gross <agross@...nel.org>,
        Bjorn Andersson <andersson@...nel.org>,
        Konrad Dybcio <konrad.dybcio@...aro.org>,
        Vinod Koul <vkoul@...nel.org>,
        Kishon Vijay Abraham I <kishon@...nel.org>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        linux-phy@...ts.infradead.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [RFC PATCH v2 1/3] dt-bindings: phy: qcom,qmp-usb3-dp: Add
 sm6350 compatible

On Fri, Nov 25, 2022 at 10:55:31AM +0100, Luca Weiss wrote:
> Hi Johan,
> 
> On Fri Nov 25, 2022 at 10:50 AM CET, Johan Hovold wrote:
> > On Fri, Nov 25, 2022 at 10:27:47AM +0100, Luca Weiss wrote:
> > > Add the compatible describing the combo phy found on SM6350.
> > > 
> > > Signed-off-by: Luca Weiss <luca.weiss@...rphone.com>
> > > ---
> > > @Johan Hovold, I've sent this v2 as RFC because there are several things
> > > where I have questions on how it should be done.
> > > 
> > > In this patch, you can see there's cfg_ahb (&xo_board) and power-domains
> > > is not set. In msm-4.19 &gcc_usb30_prim_gdsc is only used in the
> > > ssusb@...0000 node, or should I also add it to qmpphy?
> >
> > Yeah, you may need to add a platform specific section of the clocks,
> > which appear to be different, even if I'm not sure they are currently
> > described correctly (xo_board as cfg_ahb and "QLINK" as ref). How are
> > they named in the vendor's dts?
> 
> This is the msm-4.19 dts:
> https://android.googlesource.com/kernel/msm-extra/devicetree/+/refs/heads/android-msm-bramble-4.19-android11-qpr1/qcom/lagoon-usb.dtsi#354

		clocks = <&gcc GCC_USB3_PRIM_PHY_AUX_CLK>,
			<&gcc GCC_USB3_PRIM_PHY_PIPE_CLK>,
			<&rpmhcc RPMH_QLINK_CLK>,
			<&gcc GCC_USB3_PRIM_CLKREF_CLK>,
			<&gcc GCC_USB3_PRIM_PHY_COM_AUX_CLK>;
		clock-names = "aux_clk", "pipe_clk", "ref_clk_src",
				"ref_clk", "com_aux_clk";

So it looks like you don't need update the binding for the clocks as the
above matches sc8280xp:

	aux
	ref
	com_aux
	usb3_pipe

Parent clocks (ref_clk_src) should not be included in the binding, but
rather be handled by the clock driver. For example, see:

	https://lore.kernel.org/all/20221121085058.31213-4-johan+linaro@kernel.org/
	https://lore.kernel.org/all/20221115152956.21677-1-quic_shazhuss@quicinc.com/

> > >  .../bindings/phy/qcom,sc8280xp-qmp-usb43dp-phy.yaml          | 5 +++--
> > >  1 file changed, 3 insertions(+), 2 deletions(-)
> > > 
> > > diff --git a/Documentation/devicetree/bindings/phy/qcom,sc8280xp-qmp-usb43dp-phy.yaml b/Documentation/devicetree/bindings/phy/qcom,sc8280xp-qmp-usb43dp-phy.yaml
> > > index 6f31693d9868..3e39e3e0504d 100644
> > > --- a/Documentation/devicetree/bindings/phy/qcom,sc8280xp-qmp-usb43dp-phy.yaml
> > > +++ b/Documentation/devicetree/bindings/phy/qcom,sc8280xp-qmp-usb43dp-phy.yaml
> > > @@ -17,16 +17,18 @@ properties:
> > >    compatible:
> > >      enum:
> > >        - qcom,sc8280xp-qmp-usb43dp-phy
> > > +      - qcom,sm6350-qmp-usb3-dp-phy
> > >  
> > >    reg:
> > >      maxItems: 1
> > >  
> > >    clocks:
> > > -    maxItems: 4
> > > +    maxItems: 5
> > >  
> > >    clock-names:
> > >      items:
> > >        - const: aux
> > > +      - const: cfg_ahb
> > >        - const: ref
> > >        - const: com_aux
> > >        - const: usb3_pipe
> >
> > So this would need to be moved to an allOf: construct at the end with
> > one section each for sc8280xp and sm6350.
> 
> Ack.

So no need to change this it seems.

Johan