linux-kernel - Re: [RFC 3/9] PCI/portdrv: create platform devices for child OF nodes

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Message-ID: <20240112094312.GA8704@wunner.de>
Date: Fri, 12 Jan 2024 10:43:12 +0100
From: Lukas Wunner <lukas@...ner.de>
To: Bartosz Golaszewski <brgl@...ev.pl>
Cc: Kalle Valo <kvalo@...nel.org>, "David S . Miller" <davem@...emloft.net>,
	Eric Dumazet <edumazet@...gle.com>,
	Jakub Kicinski <kuba@...nel.org>, Paolo Abeni <pabeni@...hat.com>,
	Rob Herring <robh+dt@...nel.org>,
	Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
	Conor Dooley <conor+dt@...nel.org>,
	Bjorn Andersson <andersson@...nel.org>,
	Konrad Dybcio <konrad.dybcio@...aro.org>,
	Catalin Marinas <catalin.marinas@....com>,
	Will Deacon <will@...nel.org>, Bjorn Helgaas <bhelgaas@...gle.com>,
	Heiko Stuebner <heiko@...ech.de>,
	Jernej Skrabec <jernej.skrabec@...il.com>,
	Chris Morgan <macromorgan@...mail.com>,
	Linus Walleij <linus.walleij@...aro.org>,
	Geert Uytterhoeven <geert+renesas@...der.be>,
	Arnd Bergmann <arnd@...db.de>,
	Neil Armstrong <neil.armstrong@...aro.org>,
	Nícolas F . R . A . Prado <nfraprado@...labora.com>,
	Marek Szyprowski <m.szyprowski@...sung.com>,
	Peng Fan <peng.fan@....com>, Robert Richter <rrichter@....com>,
	Dan Williams <dan.j.williams@...el.com>,
	Jonathan Cameron <Jonathan.Cameron@...wei.com>,
	Terry Bowman <terry.bowman@....com>,
	Kuppuswamy Sathyanarayanan <sathyanarayanan.kuppuswamy@...ux.intel.com>,
	Ilpo Järvinen <ilpo.jarvinen@...ux.intel.com>,
	Huacai Chen <chenhuacai@...nel.org>, Alex Elder <elder@...aro.org>,
	Srini Kandagatla <srinivas.kandagatla@...aro.org>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	linux-wireless@...r.kernel.org, netdev@...r.kernel.org,
	devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
	linux-arm-msm@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
	linux-pci@...r.kernel.org,
	Bartosz Golaszewski <bartosz.golaszewski@...aro.org>
Subject: Re: [RFC 3/9] PCI/portdrv: create platform devices for child OF nodes

On Thu, Jan 11, 2024 at 05:16:45PM +0100, Bartosz Golaszewski wrote:
> On Thu, Jan 11, 2024 at 4:02???PM Lukas Wunner <lukas@...ner.de> wrote:
> > On Wed, Jan 10, 2024 at 05:26:52PM +0100, Bartosz Golaszewski wrote:
> > >     if (pci_is_bridge(dev))
> > >         of_pci_make_dev_node(dev);
> > 
> > But perhaps of_pci_make_dev_node() returns immediately because:
> 
> No, it was actually a no-op due to CONFIG_PCI_DYNAMIC_OF_NODES not
> being set. But this is only available if CONFIG_OF_DYNAMIC is enabled
> which requires OF_UNITTEST (!).
> 
> We definitely don't need to enable dynamic OF nodes. We don't want to
> modify the DT, we want to create devices for existing nodes.

Consider refactoring of_pci_make_dev_node() to suit your needs or
add a separate function call inside the "if (pci_is_bridge(dev))"
clause which populates the child OF nodes.

Thanks,

Lukas