Re: [PATCH v2 1/6] dt-bindings: phy: qcom,uniphy-pcie: Document PCIe uniphy

Varadarajan Narayanan
2024-12-11T08:52:03Z

On Thu, Dec 05, 2024 at 10:38:05AM +0100, Krzysztof Kozlowski wrote:
> On Wed, Dec 04, 2024 at 05:03:24PM +0530, Varadarajan Narayanan wrote:
> > From: Nitheesh Sekar <quic_nsekar@quicinc.com>
> >
> > Document the Qualcomm UNIPHY PCIe 28LP present in IPQ5332.
> >
> > Signed-off-by: Nitheesh Sekar <quic_nsekar@quicinc.com>
> > Signed-off-by: Varadarajan Narayanan <quic_varada@quicinc.com>
> > ---
> > v2: Rename the file to match the compatible
>
> Either I look at wrong v1 from your cover letter or there was no such
> file in v1, so how it can be a rename?
>
> What happened here?

This driver was pulled in from [1] "Enable IPQ5018 PCI support (Nitheesh Sekar)"

In that review, there was this feedback [4]

-------------------------------
> +++
> b/Documentation/devicetree/bindings/phy/qcom,uniphy-pcie-28lp.yaml

Filename should match compatibles and they do not use 28lp.
-------------------------------

> > Drop 'driver' from title
> > Dropped 'clock-names'
> > Fixed 'reset-names'
> > --
> > .../bindings/phy/qcom,uniphy-pcie.yaml | 82 +++++++++++++++++++
> > 1 file changed, 82 insertions(+)
> > create mode 100644 Documentation/devicetree/bindings/phy/qcom,uniphy-pcie.yaml
> >
> > diff --git a/Documentation/devicetree/bindings/phy/qcom,uniphy-pcie.yaml b/Documentation/devicetree/bindings/phy/qcom,uniphy-pcie.yaml
> > new file mode 100644
> > index 000000000000..e0ad98a9f324
> > --- /dev/null
> > +++ b/Documentation/devicetree/bindings/phy/qcom,uniphy-pcie.yaml
>
> This does not match compatible, so I don't see how it even matches your
> changelog.

Since this phy has both single and dual line capabilities I used
the phy's name alone for the file name. Will rename this as

qcom,ipq5332-uniphy-pcie-phy.yaml

If this is not suitable, can you please suggest one that would be
apt for this phy.

> > @@ -0,0 +1,82 @@
> > +# SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause)
> > +%YAML 1.2
> > +---
> > +$id: http://devicetree.org/schemas/phy/qcom,uniphy-pcie.yaml#
> > +$schema: http://devicetree.org/meta-schemas/core.yaml#
> > +
> > +title: Qualcomm UNIPHY PCIe 28LP PHY
> > +
> > +maintainers:
> > + - Nitheesh Sekar <quic_nsekar@quicinc.com>
> > + - Varadarajan Narayanan <quic_varada@quicinc.com>
> > +
> > +description:
> > + PCIe and USB combo PHY found in Qualcomm IPQ5332 SoC
> > +
> > +properties:
> > + compatible:
> > + enum:
> > + - qcom,ipq5332-uniphy-pcie-gen3x1
>
> Odd naming. Did anyone suggest this? I would expect something matches
> like everything else recent (see X1 for example).

It was not suggested by anyone. Since [4] didn't comment on this
continued to use it. Will change it as follows (similar to
qcom,x1e80100-qmp-gen4x2-pcie-phy)

qcom,ipq5332-uniphy-gen3x1-pcie-phy
qcom,ipq5332-uniphy-gen3x2-pcie-phy
>
> > + - qcom,ipq5332-uniphy-pcie-gen3x2
> > +
> > + reg:
> > + maxItems: 1
> > +
> > + clocks:
> > + minItems: 2
>
> What happened here? This cannot be minItems and it never was.

Will fix this.

> > +
> > + resets:
> > + minItems: 2
> > + maxItems: 3
>
> Why this varies?
>
> This patch is odd. Confusing changelog, v1 entirely different and not
> matching what is here, unusual and incorrect code in the binding itself.
>
> Provide changelog explaining WHY you did such odd changes.

This series combines [1] and [2]. [1] introduces IPQ5018 PCIe
support and [2] depends on [1] to introduce IPQ5332 PCIe support.
Since the community was interested in [2] (please see [3]), tried
to revive IPQ5332's PCIe support with this patch. Apologies for
not expressing this in the cover letter.

> Open *LATEST* existing Qcom bindings and look how they do it. Do not
> implement things differently.

Sure.

Thanks
Varada

1. Enable IPQ5018 PCI support (Nitheesh Sekar) - https://lore.kernel.org/all/20231003120846.28626-1-quic_nsekar@quicinc.com/
2. Add PCIe support for Qualcomm IPQ5332 (Praveenkumar I) - https://lore.kernel.org/linux-arm-msm/20231214062847.2215542-1-quic_ipkumar@quicinc.com/
3. Community interest - https://lore.kernel.org/linux-arm-msm/20240310132915.GE3390@thinkpad/
4. dt-bindings feedback - https://lore.kernel.org/all/4bc021c1-0198-41a4-aa73-bf0cf0c0420a@linaro.org/