linux-kernel - Re: [PATCH v4 2/5] dt-bindings: pci: cadence: Extend compatible for new EP configurations

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Message-ID: <20250424-proposal-decrease-ba384a37efa6@spud>
Date: Thu, 24 Apr 2025 16:30:37 +0100
From: Conor Dooley <conor@...nel.org>
To: hans.zhang@...tech.com
Cc: bhelgaas@...gle.com, lpieralisi@...nel.org, kw@...ux.com,
	manivannan.sadhasivam@...aro.org, robh@...nel.org,
	krzk+dt@...nel.org, conor+dt@...nel.org, peter.chen@...tech.com,
	linux-pci@...r.kernel.org, devicetree@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	Manikandan K Pillai <mpillai@...ence.com>
Subject: Re: [PATCH v4 2/5] dt-bindings: pci: cadence: Extend compatible for
 new EP configurations

On Thu, Apr 24, 2025 at 04:29:35PM +0100, Conor Dooley wrote:
> On Thu, Apr 24, 2025 at 09:04:41AM +0800, hans.zhang@...tech.com wrote:
> > From: Manikandan K Pillai <mpillai@...ence.com>
> > 
> > Document the compatible property for HPA (High Performance Architecture)
> > PCIe controller EP configuration.
> 
> Please explain what makes the new architecture sufficiently different
> from the existing one such that a fallback compatible does not work.
> 
> Same applies to the other binding patch.

Additionally, since this IP is likely in use on your sky1 SoC, why is a
soc-specific compatible for your integration not needed?

> 
> Thanks,
> Conor.
> 
> > 
> > Signed-off-by: Manikandan K Pillai <mpillai@...ence.com>
> > Signed-off-by: Hans Zhang <hans.zhang@...tech.com>
> > ---
> >  .../devicetree/bindings/pci/cdns,cdns-pcie-ep.yaml          | 6 ++++--
> >  1 file changed, 4 insertions(+), 2 deletions(-)
> > 
> > diff --git a/Documentation/devicetree/bindings/pci/cdns,cdns-pcie-ep.yaml b/Documentation/devicetree/bindings/pci/cdns,cdns-pcie-ep.yaml
> > index 98651ab22103..a7e404e4f690 100644
> > --- a/Documentation/devicetree/bindings/pci/cdns,cdns-pcie-ep.yaml
> > +++ b/Documentation/devicetree/bindings/pci/cdns,cdns-pcie-ep.yaml
> > @@ -7,14 +7,16 @@ $schema: http://devicetree.org/meta-schemas/core.yaml#
> >  title: Cadence PCIe EP Controller
> >  
> >  maintainers:
> > -  - Tom Joseph <tjoseph@...ence.com>
> > +  - Manikandan K Pillai <mpillai@...ence.com>
> >  
> >  allOf:
> >    - $ref: cdns-pcie-ep.yaml#
> >  
> >  properties:
> >    compatible:
> > -    const: cdns,cdns-pcie-ep
> > +    enum:
> > +      - cdns,cdns-pcie-ep
> > +      - cdns,cdns-pcie-hpa-ep
> >  
> >    reg:
> >      maxItems: 2
> > -- 
> > 2.47.1
> > 



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