linux-kernel - Re: [PATCH 2/9] arm64: dts: qcom: ipq8074: fix Gen3 PCIe QMP PHY

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Date:   Tue, 27 Dec 2022 13:20:49 -0600
From:   Bjorn Andersson <andersson@...nel.org>
To:     Robert Marko <robimarko@...il.com>
Cc:     agross@...nel.org, konrad.dybcio@...aro.org, bhelgaas@...gle.com,
        robh+dt@...nel.org, krzysztof.kozlowski+dt@...aro.org,
        mani@...nel.org, lpieralisi@...nel.org, kw@...ux.com,
        svarbanov@...sol.com, shawn.guo@...aro.org,
        linux-arm-msm@...r.kernel.org, linux-pci@...r.kernel.org,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/9] arm64: dts: qcom: ipq8074: fix Gen3 PCIe QMP PHY

On Tue, Dec 06, 2022 at 10:51:40AM +0100, Robert Marko wrote:
> On Mon, 5 Dec 2022 at 22:52, Bjorn Andersson <andersson@...nel.org> wrote:
> >
> > On Wed, Nov 16, 2022 at 10:48:34PM +0100, Robert Marko wrote:
> > > IPQ8074 comes in 2 silicon versions:
> > > * v1 with 2x Gen2 PCIe ports and QMP PHY-s
> > > * v2 with 1x Gen3 and 1x Gen2 PCIe ports and QMP PHY-s
> > >
> > > v2 is the final and production version that is actually supported by the
> > > kernel, however it looks like PCIe related nodes were added for the v1 SoC.
> > >
> > > Now that we have Gen3 QMP PHY support, we can start fixing the PCIe support
> > > by fixing the Gen3 QMP PHY node first.
> > >
> > > Change the compatible to the Gen3 QMP PHY, correct the register space start
> > > and size, add the missing misc PCS register space.
> > >
> >
> > Does this imply that the current node doesn't actually work?
> 
> Hi Bjorn,
> Yes, the node is for a completely different PHY generation, basically
> PCIe on IPQ8074
> is completely broken, hence this patch series.
> 
> >
> > If that's the case, could we perhaps adopt Johan Hovolds' new binding
> > and drop the subnode in favor of just a flat reg covering the whole
> > QMP region?
> 
> I have not seen that so far, any examples?
> 

See
Documentation/devicetree/bindings/phy/qcom,sc8280xp-qmp-pcie-phy.yaml in
v6.2-rc1.

The idea is to, at least, use this for all new platforms introduced.

And if the current definition doesn't actually work I suggest that we
replace it with the new one.

Regards,
Bjorn