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

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Message-ID: <20231130173153.1ce8a354@bootlin.com>
Date:   Thu, 30 Nov 2023 17:31:53 +0100
From:   Herve Codina <herve.codina@...tlin.com>
To:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>
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>,
        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 2/2] PCI: of: Attach created of_node to existing device

Hi Greg,

On Thu, 30 Nov 2023 16:18:58 +0000
Greg Kroah-Hartman <gregkh@...uxfoundation.org> wrote:

> On Thu, Nov 30, 2023 at 04:24:04PM +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 and tell fwnode that the
> > device attached to this of_node is ready (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  
> 
> How can this be cc: stable when the api it relies on is not?
> 
> confused,

My bad, I will add cc: stable in the other patch needed.

Sorry about that.
Hervé

-- 
Hervé Codina, Bootlin
Embedded Linux and Kernel engineering
https://bootlin.com