linux-kernel - Re: [PATCH 1/4 v4] dt-bindings: PCI: s32g: Add NXP PCIe controller

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Message-ID: <CAKfTPtBT6qT2zC8toUOEFD_ZkJPBMJgZrZc2NCAFSUXANYJ==Q@mail.gmail.com>
Date: Thu, 13 Nov 2025 15:19:06 +0100
From: Vincent Guittot <vincent.guittot@...aro.org>
To: Frank Li <Frank.li@....com>
Cc: chester62515@...il.com, mbrugger@...e.com, ghennadi.procopciuc@....nxp.com, 
	s32@....com, bhelgaas@...gle.com, jingoohan1@...il.com, lpieralisi@...nel.org, 
	kwilczynski@...nel.org, mani@...nel.org, robh@...nel.org, krzk+dt@...nel.org, 
	conor+dt@...nel.org, Ionut.Vicovan@....com, larisa.grigore@....com, 
	ciprianmarian.costea@....com, bogdan.hamciuc@....com, 
	linux-arm-kernel@...ts.infradead.org, linux-pci@...r.kernel.org, 
	devicetree@...r.kernel.org, linux-kernel@...r.kernel.org, imx@...ts.linux.dev, 
	cassel@...nel.org
Subject: Re: [PATCH 1/4 v4] dt-bindings: PCI: s32g: Add NXP PCIe controller

On Mon, 10 Nov 2025 at 18:59, Frank Li <Frank.li@....com> wrote:
>
> On Mon, Nov 10, 2025 at 06:33:31PM +0100, Vincent Guittot wrote:
> > Describe the PCIe host controller available on the S32G platforms.
> >
> > Co-developed-by: Ionut Vicovan <Ionut.Vicovan@....com>
> > Signed-off-by: Ionut Vicovan <Ionut.Vicovan@....com>
> > Co-developed-by: Bogdan-Gabriel Roman <bogdan-gabriel.roman@....com>
> > Signed-off-by: Bogdan-Gabriel Roman <bogdan-gabriel.roman@....com>
> > Co-developed-by: Larisa Grigore <larisa.grigore@....com>
> > Signed-off-by: Larisa Grigore <larisa.grigore@....com>
> > Co-developed-by: Ghennadi Procopciuc <Ghennadi.Procopciuc@....com>
> > Signed-off-by: Ghennadi Procopciuc <Ghennadi.Procopciuc@....com>
> > Co-developed-by: Ciprian Marian Costea <ciprianmarian.costea@....com>
> > Signed-off-by: Ciprian Marian Costea <ciprianmarian.costea@....com>
> > Co-developed-by: Bogdan Hamciuc <bogdan.hamciuc@....com>
> > Signed-off-by: Bogdan Hamciuc <bogdan.hamciuc@....com>
> > Signed-off-by: Vincent Guittot <vincent.guittot@...aro.org>
> > ---
> >  .../bindings/pci/nxp,s32g-pcie.yaml           | 130 ++++++++++++++++++
> >  1 file changed, 130 insertions(+)
> >  create mode 100644 Documentation/devicetree/bindings/pci/nxp,s32g-pcie.yaml
> >
> > diff --git a/Documentation/devicetree/bindings/pci/nxp,s32g-pcie.yaml b/Documentation/devicetree/bindings/pci/nxp,s32g-pcie.yaml
> > new file mode 100644
> > index 000000000000..6077c251c2cd
> > --- /dev/null
> > +++ b/Documentation/devicetree/bindings/pci/nxp,s32g-pcie.yaml
> > @@ -0,0 +1,130 @@
> > +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
> > +%YAML 1.2
> > +---
> > +$id: http://devicetree.org/schemas/pci/nxp,s32g-pcie.yaml#
> > +$schema: http://devicetree.org/meta-schemas/core.yaml#
> > +
> > +title: NXP S32G2xxx/S32G3xxx PCIe Root Complex controller
> > +
> > +maintainers:
> > +  - Bogdan Hamciuc <bogdan.hamciuc@....com>
> > +  - Ionut Vicovan <ionut.vicovan@....com>
> > +
> > +description:
> > +  This PCIe controller is based on the Synopsys DesignWare PCIe IP.
> > +  The S32G SoC family has two PCIe controllers, which can be configured as
> > +  either Root Complex or Endpoint.
> > +
> > +allOf:
> > +  - $ref: /schemas/pci/snps,dw-pcie.yaml#
>
> Suggest move allOf after required, in case add if-else branch later.

okay
>
> > +
> > +properties:
> > +  compatible:
> > +    oneOf:
> > +      - enum:
> > +          - nxp,s32g2-pcie
> > +      - items:
> > +          - const: nxp,s32g3-pcie
> > +          - const: nxp,s32g2-pcie
> > +
> > +  reg:
> > +    maxItems: 6
> > +
> > +  reg-names:
> > +    items:
> > +      - const: dbi
> > +      - const: dbi2
> > +      - const: atu
> > +      - const: dma
> > +      - const: ctrl
> > +      - const: config
> > +
> > +  interrupts:
> > +    maxItems: 2
>
> Need match interrupt-names's restriction
>
>       minItems: 1
>       maxItems: 2

Yes

>
> > +
> > +  interrupt-names:
> > +    items:
> > +      - const: msi
> > +      - const: dma
> > +    minItems: 1
> > +
> ...
> > +
> > +        pcie@...00000 {
> > +            compatible = "nxp,s32g3-pcie",
> > +                         "nxp,s32g2-pcie";
>
> put to one line to save LOC.

Okay

>
> Frank
> > +            reg = <0x00 0x40400000 0x0 0x00001000>,   /* dbi registers */
> > +                  <0x00 0x40420000 0x0 0x00001000>,   /* dbi2 registers */
> > +                  <0x00 0x40460000 0x0 0x00001000>,   /* atu registers */
> > +                  <0x00 0x40470000 0x0 0x00001000>,   /* dma registers */
> > +                  <0x00 0x40481000 0x0 0x000000f8>,   /* ctrl registers */
> > +                  <0x5f 0xffffe000 0x0 0x00002000>;   /* config space */
> ...
> > +            };
> > +        };
> > +    };
> > --
> > 2.43.0
> >