linux-kernel - Re: [PATCH v2 2/4] dt-bindings: PCI: mediatek,mt7621: add missing child node reg

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Message-ID: <458ce909-0616-487d-b4bd-42b58d059198@linaro.org>
Date: Thu, 11 Apr 2024 08:01:37 +0200
From: Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
To: Bjorn Helgaas <helgaas@...nel.org>
Cc: Bjorn Helgaas <bhelgaas@...gle.com>,
 Lorenzo Pieralisi <lpieralisi@...nel.org>,
 Krzysztof Wilczyński <kw@...ux.com>,
 Rob Herring <robh@...nel.org>, Krzysztof Kozlowski <krzk+dt@...nel.org>,
 Conor Dooley <conor+dt@...nel.org>, Hector Martin <marcan@...can.st>,
 Sven Peter <sven@...npeter.dev>, Alyssa Rosenzweig <alyssa@...enzweig.io>,
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Subject: Re: [PATCH v2 2/4] dt-bindings: PCI: mediatek,mt7621: add missing
 child node reg

On 10/04/2024 23:26, Bjorn Helgaas wrote:
> On Wed, Apr 10, 2024 at 08:15:19PM +0200, Krzysztof Kozlowski wrote:
>> MT7621 PCI host bridge has children which apparently are also PCI host
>> bridges, at least that's what the binding suggest.
> 
> What does it even mean for a PCI host bridge to have a child that is
> also a PCI host bridge?
> 
> Does this mean a driver binds to the "parent" host bridge, enumerates
> the PCI devices below it, and finds a "child" host bridge?

I think the question should be towards Mediatek folks. I don't know what
this hardware is exactly, just looks like pci-pci-bridge. The driver
calls the children host bridges as "ports".

Best regards,
Krzysztof