linux-kernel - Re: [PATCH v3 2/2] PCI: of: Attach created of

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Date: Thu, 11 Apr 2024 15:23:55 +0200
From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To: Herve Codina <herve.codina@...tlin.com>
Cc: "Rafael J. Wysocki" <rafael@...nel.org>,
	Bjorn Helgaas <bhelgaas@...gle.com>, Lizhi Hou <lizhi.hou@....com>,
	Rob Herring <robh@...nel.org>, Max Zhen <max.zhen@....com>,
	Sonal Santan <sonal.santan@....com>,
	Stefano Stabellini <stefano.stabellini@...inx.com>,
	Jonathan Cameron <Jonathan.Cameron@...wei.com>,
	Krzysztof Wilczyński <kwilczynski@...nel.org>,
	linux-kernel@...r.kernel.org, linux-pci@...r.kernel.org,
	Allan Nielsen <allan.nielsen@...rochip.com>,
	Horatiu Vultur <horatiu.vultur@...rochip.com>,
	Steen Hegelund <steen.hegelund@...rochip.com>,
	Thomas Petazzoni <thomas.petazzoni@...tlin.com>,
	stable@...r.kernel.org
Subject: Re: [PATCH v3 2/2] PCI: of: Attach created of_node to existing device

On Mon, Mar 25, 2024 at 04:39:15PM +0100, Herve Codina wrote:
> The commit 407d1a51921e ("PCI: Create device tree node for bridge")
> creates of_node for PCI devices.
> 
> During the insertion handling of these new DT nodes done by of_platform,
> new devices (struct device) are created. For each PCI devices a struct
> device is already present (created and handled by the PCI core).
> Having a second struct device to represent the exact same PCI device is
> not correct.
> 
> On the of_node creation:
> - tell the of_platform that there is no need to create a device for this
>   node (OF_POPULATED flag),
> - link this newly created of_node to the already present device,
> - tell fwnode that the device attached to this of_node is ready using
>   fwnode_dev_initialized().
> 
> With this fix, the of_node are available in the sysfs device tree:
> /sys/devices/platform/soc/d0070000.pcie/
> + of_node -> .../devicetree/base/soc/pcie@...70000
> + pci0000:00
>   + 0000:00:00.0
>     + of_node -> .../devicetree/base/soc/pcie@...70000/pci@0,0
>     + 0000:01:00.0
>       + of_node -> .../devicetree/base/soc/pcie@...70000/pci@0,0/dev@0,0
> 
> On the of_node removal, revert the operations.
> 
> Fixes: 407d1a51921e ("PCI: Create device tree node for bridge")
> Cc: stable@...r.kernel.org
> Signed-off-by: Herve Codina <herve.codina@...tlin.com>

I need an ack from the maintainer here before I can take this.

thanks,

greg k-h