linux-kernel - Re: [PATCH v6 15/16] dt-bindings: imx6q-pcie: Add iMX95 pcie endpoint compatible string

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Date: Tue, 26 Dec 2023 16:53:01 -0500
From: Frank Li <Frank.li@....com>
To: Krzysztof Kozlowski <krzysztof.kozlowski@...aro.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, robh@...nel.org,
	s.hauer@...gutronix.de, shawnguo@...nel.org
Subject: Re: [PATCH v6 15/16] dt-bindings: imx6q-pcie: Add iMX95 pcie
 endpoint compatible string

On Tue, Dec 26, 2023 at 08:01:53PM +0100, Krzysztof Kozlowski wrote:
> On 26/12/2023 17:12, Frank Li wrote:
> > On Mon, Dec 25, 2023 at 08:16:17PM +0100, Krzysztof Kozlowski wrote:
> >> On 24/12/2023 19:32, Frank Li wrote:
> >>> Add i.MX95 PCIe "fsl,imx95-pcie-ep" compatible string.
> >>> Add reg-name: "atu", "dbi2", "dma" and "app".
> >>> Reuse PCI linux,pci-domain as controller id at endpoint.
> >>>
> >>> Signed-off-by: Frank Li <Frank.Li@....com>
> >>> ---
> >>>
> >>
> >> ...
> >>
> >>> +# reuse PCI linux,pci-domain as controller id at Endpoint
> >>> +  - if:
> >>> +      properties:
> >>> +        compatible:
> >>> +          enum:
> >>> +            - fsl,imx95-pcie-ep
> >>> +    then:
> >>> +      properties:
> >>> +        linux,pci-domain: true
> >>
> >> Same comment: why do you need? Don't ignore my feedback. You responded
> >> you will fix it, but it is still here...
> > 
> > DTB_CHECK report error after I remove it. linux,pci-domain is only define
> > in pci, not pci-ep.
> 
> Ah, thank you, indeed.
> 
> > 
> > So I add comments about this. linux,pci-domain was resued ad controller id.
> 
> However maybe there is reason why it is not for endpoints. The
> description is saying it is valid only for host bridge, so maybe it
> should not be used for endpoint case?

EP side, it is not PCI bus. So it is reasonable that linux,pci-doamin not
in EP side.

iMX6 host driver(and other some host controller drivers) already use it as
"controller id". EP driver is mostly reused with host bridge drivers. I
think needn't create new property such as "controller_id" for EP only.

A comments should be enough for this case.

Frank

> > 
> > If include pci.yaml, there are too much other properties was involved, but
> > not used by pci-ep.
> 
> Best regards,
> Krzysztof
>