linux-kernel - Re: [PATCH 4/9] PCI: create platform devices for child OF nodes of the port node

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Date: Wed, 17 Jan 2024 17:45:37 +0100
From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
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>, Lukas Wunner <lukas@...ner.de>,
	Huacai Chen <chenhuacai@...nel.org>, Alex Elder <elder@...aro.org>,
	Srini Kandagatla <srinivas.kandagatla@...aro.org>,
	Abel Vesa <abel.vesa@...aro.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: [PATCH 4/9] PCI: create platform devices for child OF nodes of
 the port node

On Wed, Jan 17, 2024 at 05:07:43PM +0100, Bartosz Golaszewski wrote:
> From: Bartosz Golaszewski <bartosz.golaszewski@...aro.org>
> 
> In order to introduce PCI power-sequencing, we need to create platform
> devices for child nodes of the port node.

Ick, why a platform device?  What is the parent of this device, a PCI
device?  If so, then this can't be a platform device, as that's not what
it is, it's something else so make it a device of that type,.

> They will get matched against
> the pwrseq drivers (if one exists) and then the actual PCI device will
> reuse the node once it's detected on the bus.

Reuse it how?

> Signed-off-by: Bartosz Golaszewski <bartosz.golaszewski@...aro.org>
> ---
>  drivers/pci/bus.c    | 9 ++++++++-
>  drivers/pci/remove.c | 3 ++-
>  2 files changed, 10 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/pci/bus.c b/drivers/pci/bus.c
> index 9c2137dae429..8ab07f711834 100644
> --- a/drivers/pci/bus.c
> +++ b/drivers/pci/bus.c
> @@ -12,6 +12,7 @@
>  #include <linux/errno.h>
>  #include <linux/ioport.h>
>  #include <linux/of.h>
> +#include <linux/of_platform.h>
>  #include <linux/proc_fs.h>
>  #include <linux/slab.h>
>  
> @@ -342,8 +343,14 @@ void pci_bus_add_device(struct pci_dev *dev)
>  	 */
>  	pcibios_bus_add_device(dev);
>  	pci_fixup_device(pci_fixup_final, dev);
> -	if (pci_is_bridge(dev))
> +	if (pci_is_bridge(dev)) {
>  		of_pci_make_dev_node(dev);
> +		retval = of_platform_populate(dev->dev.of_node, NULL, NULL,
> +					      &dev->dev);

So this is a pci bridge device, not a platform device, please don't do
this, make it a real device of a new type.

thanks,

greg k-h