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

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Message-ID: <20240109144327.GA10780@wunner.de>
Date: Tue, 9 Jan 2024 15:43:27 +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>,
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	Jernej Skrabec <jernej.skrabec@...il.com>,
	Chris Morgan <macromorgan@...mail.com>,
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	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 04, 2024 at 02:01:17PM +0100, Bartosz Golaszewski wrote:
> In order to introduce PCIe power-sequencing, we need to create platform
> devices for child nodes of the port driver node. They will get matched
> against the pwrseq drivers (if one exists) and then the actuak PCIe
> device will reuse the node once it's detected on the bus.
[...]
> --- a/drivers/pci/pcie/portdrv.c
> +++ b/drivers/pci/pcie/portdrv.c
> @@ -715,7 +716,7 @@ static int pcie_portdrv_probe(struct pci_dev *dev,
>  		pm_runtime_allow(&dev->dev);
>  	}
>  
> -	return 0;
> +	return devm_of_platform_populate(&dev->dev);
>  }

I think this belongs in of_pci_make_dev_node(), portdrv seems totally
the wrong place.  Note that you're currently calling this for RCECs
(Root Complex Event Collectors) as well, which is likely not what
you want.

devm functions can't be used in the PCI core, so symmetrically call
of_platform_unpopulate() from of_pci_remove_node().

Thanks,

Lukas