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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 WilczyƄski <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>,
 Ray Jui <rjui@...adcom.com>, Scott Branden <sbranden@...adcom.com>,
 Broadcom internal kernel review list
 <bcm-kernel-feedback-list@...adcom.com>,
 Florian Fainelli <florian.fainelli@...adcom.com>,
 Jim Quinlan <jim2101024@...il.com>,
 Nicolas Saenz Julienne <nsaenz@...nel.org>, Will Deacon <will@...nel.org>,
 Linus Walleij <linus.walleij@...aro.org>,
 Srikanth Thokala <srikanth.thokala@...el.com>,
 Ryder Lee <ryder.lee@...iatek.com>, Jianjun Wang
 <jianjun.wang@...iatek.com>,
 Sergio Paracuellos <sergio.paracuellos@...il.com>,
 Matthias Brugger <matthias.bgg@...il.com>,
 AngeloGioacchino Del Regno <angelogioacchino.delregno@...labora.com>,
 Daire McNamara <daire.mcnamara@...rochip.com>,
 Bjorn Andersson <andersson@...nel.org>,
 Konrad Dybcio <konrad.dybcio@...aro.org>,
 Marek Vasut <marek.vasut+renesas@...il.com>,
 Yoshihiro Shimoda <yoshihiro.shimoda.uh@...esas.com>,
 Shawn Lin <shawn.lin@...k-chips.com>, Heiko Stuebner <heiko@...ech.de>,
 Jingoo Han <jingoohan1@...il.com>,
 Gustavo Pimentel <gustavo.pimentel@...opsys.com>,
 Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>,
 Bharat Kumar Gogada <bharat.kumar.gogada@....com>,
 Michal Simek <michal.simek@....com>,
 Geert Uytterhoeven <geert+renesas@...der.be>,
 Magnus Damm <magnus.damm@...il.com>,
 Neil Armstrong <neil.armstrong@...aro.org>,
 Mark Kettenis <kettenis@...nbsd.org>, Tom Joseph <tjoseph@...ence.com>,
 Ahmad Zainie <wan.ahmad.zainie.wan.mohamad@...el.com>,
 Jiaxun Yang <jiaxun.yang@...goat.com>,
 Kishon Vijay Abraham I <kishon@...nel.org>,
 Thippeswamy Havalige <thippeswamy.havalige@....com>,
 linux-pci@...r.kernel.org, devicetree@...r.kernel.org,
 linux-kernel@...r.kernel.org, asahi@...ts.linux.dev,
 linux-arm-kernel@...ts.infradead.org, linux-rpi-kernel@...ts.infradead.org,
 linux-mediatek@...ts.infradead.org, linux-arm-msm@...r.kernel.org,
 linux-renesas-soc@...r.kernel.org, linux-rockchip@...ts.infradead.org
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


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