linux-kernel - Re: [PATCH v3 08/13] dt-bindings: imx6q-pcie: Add imx95 pcie compatible string

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Date:   Tue, 12 Dec 2023 18:28:43 -0500
From:   Frank Li <Frank.li@....com>
To:     Rob Herring <robh@...nel.org>
Cc:     bhelgaas@...gle.com, conor+dt@...nel.org,
        devicetree@...r.kernel.org, festevam@...il.com, helgaas@...nel.org,
        hongxing.zhu@....com, imx@...ts.linux.dev, kernel@...gutronix.de,
        krzysztof.kozlowski+dt@...aro.org, kw@...ux.com,
        l.stach@...gutronix.de, linux-arm-kernel@...ts.infradead.org,
        linux-imx@....com, linux-kernel@...r.kernel.org,
        linux-pci@...r.kernel.org, lpieralisi@...nel.org,
        manivannan.sadhasivam@...aro.org, s.hauer@...gutronix.de,
        shawnguo@...nel.org
Subject: Re: [PATCH v3 08/13] dt-bindings: imx6q-pcie: Add imx95 pcie
 compatible string

On Tue, Dec 12, 2023 at 04:44:26PM -0600, Rob Herring wrote:
> On Mon, Dec 11, 2023 at 04:58:37PM -0500, Frank Li wrote:
> > From: Richard Zhu <hongxing.zhu@....com>
> > 
> > Add i.MX95 PCIe "fsl,imx95-pcie" compatible string.
> > Add "atu" and "serdes" to reg-names.
> > 
> > Signed-off-by: Richard Zhu <hongxing.zhu@....com>
> > ---
> > 
> > Notes:
> >     Change from v2 to v3
> >     - Remove krzy's ACK tag
> >     - Add condition check for imx95, which required more reg-names then old
> >     platform, so need Krzy review again,
> >     
> >     Change from v1 to v2
> >     - add Krzy's ACK tag
> > 
> >  .../bindings/pci/fsl,imx6q-pcie.yaml           | 18 ++++++++++++++++++
> >  1 file changed, 18 insertions(+)
> > 
> > diff --git a/Documentation/devicetree/bindings/pci/fsl,imx6q-pcie.yaml b/Documentation/devicetree/bindings/pci/fsl,imx6q-pcie.yaml
> > index 81bbb8728f0f9..b8fcf8258f031 100644
> > --- a/Documentation/devicetree/bindings/pci/fsl,imx6q-pcie.yaml
> > +++ b/Documentation/devicetree/bindings/pci/fsl,imx6q-pcie.yaml
> > @@ -29,6 +29,7 @@ properties:
> >        - fsl,imx8mq-pcie
> >        - fsl,imx8mm-pcie
> >        - fsl,imx8mp-pcie
> > +      - fsl,imx95-pcie
> >  
> >    reg:
> >      items:
> > @@ -90,6 +91,22 @@ required:
> >  allOf:
> >    - $ref: /schemas/pci/snps,dw-pcie.yaml#
> >    - $ref: /schemas/pci/fsl,imx6q-pcie-common.yaml#
> > +  - if:
> > +      properties:
> > +        compatible:
> > +          enum:
> > +            - fsl,imx95-pcie
> > +    then:
> > +      properties:
> > +        reg:
> > +          minItems: 4
> > +        reg-names:
> > +          items:
> > +            - const: dbi
> > +            - const: serdes
> 
> Did you test this? It should fail because 'serdes' would need to be 
> added to snps,dw-pcie.yaml.

I run "make dt_binding_check DT_SCHEMA_FILES=/pci/", no error report.
And PCIe function can work.

> 
> Is this really not a separate phy block?

This is misc block, which included phy and also include some registers
about SID for each PCI devices. I plan do it later.


> A separate node would be 
> ideal. If not, there's already a 'phy' name you can use here. We don't 
> want more random names.

Chip reference manual call it as 'serdes'. If there are already similar
name, I can reuse it.

> 
> Rob