linux-kernel - Re: [PATCH v8 14/17] PCI/pwrctl: create platform devices for child OF nodes of the port node

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Message-ID: <20240611225628.GA1005877@bhelgaas>
Date: Tue, 11 Jun 2024 17:56:28 -0500
From: Bjorn Helgaas <helgaas@...nel.org>
To: Bartosz Golaszewski <brgl@...ev.pl>
Cc: Liam Girdwood <lgirdwood@...il.com>, Mark Brown <broonie@...nel.org>,
	Rob Herring <robh@...nel.org>,
	Krzysztof Kozlowski <krzk+dt@...nel.org>,
	Conor Dooley <conor+dt@...nel.org>,
	Marcel Holtmann <marcel@...tmann.org>,
	Luiz Augusto von Dentz <luiz.dentz@...il.com>,
	"David S. Miller" <davem@...emloft.net>,
	Eric Dumazet <edumazet@...gle.com>,
	Jakub Kicinski <kuba@...nel.org>, Paolo Abeni <pabeni@...hat.com>,
	Balakrishna Godavarthi <quic_bgodavar@...cinc.com>,
	Rocky Liao <quic_rjliao@...cinc.com>, Kalle Valo <kvalo@...nel.org>,
	Jeff Johnson <jjohnson@...nel.org>,
	Bjorn Andersson <andersson@...nel.org>,
	Konrad Dybcio <konrad.dybcio@...aro.org>,
	Bjorn Helgaas <bhelgaas@...gle.com>,
	Srini Kandagatla <srinivas.kandagatla@...aro.org>,
	Elliot Berman <quic_eberman@...cinc.com>,
	Caleb Connolly <caleb.connolly@...aro.org>,
	Neil Armstrong <neil.armstrong@...aro.org>,
	Dmitry Baryshkov <dmitry.baryshkov@...aro.org>,
	Alex Elder <elder@...nel.org>, linux-arm-msm@...r.kernel.org,
	linux-kernel@...r.kernel.org, devicetree@...r.kernel.org,
	linux-bluetooth@...r.kernel.org, netdev@...r.kernel.org,
	linux-wireless@...r.kernel.org, ath11k@...ts.infradead.org,
	Jeff Johnson <quic_jjohnson@...cinc.com>,
	ath12k@...ts.infradead.org, linux-pm@...r.kernel.org,
	linux-pci@...r.kernel.org,
	Bartosz Golaszewski <bartosz.golaszewski@...aro.org>,
	kernel@...cinc.com, Amit Pundir <amit.pundir@...aro.org>
Subject: Re: [PATCH v8 14/17] PCI/pwrctl: create platform devices for child
 OF nodes of the port node

On Tue, May 28, 2024 at 09:03:22PM +0200, Bartosz Golaszewski wrote:
> From: Bartosz Golaszewski <bartosz.golaszewski@...aro.org>
> 
> In preparation for introducing PCI device power control - a set of
> library functions that will allow powering-up of PCI devices before
> they're detected on the PCI bus - we need to populate the devices
> defined on the device-tree.
> 
> We are reusing the platform bus as it provides us with all the
> infrastructure we need to match the pwrctl drivers against the
> compatibles from OF nodes.
> 
> These platform devices will be probed by the driver core and bound to
> the PCI pwrctl drivers we'll introduce later.
> 
> Tested-by: Amit Pundir <amit.pundir@...aro.org>
> Signed-off-by: Bartosz Golaszewski <bartosz.golaszewski@...aro.org>

With s/create/Create/ in subject,

Acked-by: Bjorn Helgaas <bhelgaas@...gle.com>

> ---
>  drivers/pci/bus.c    | 9 +++++++++
>  drivers/pci/remove.c | 3 ++-
>  2 files changed, 11 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/pci/bus.c b/drivers/pci/bus.c
> index 826b5016a101..3e3517567721 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>
>  
> @@ -354,6 +355,14 @@ void pci_bus_add_device(struct pci_dev *dev)
>  		pci_warn(dev, "device attach failed (%d)\n", retval);
>  
>  	pci_dev_assign_added(dev, true);
> +
> +	if (pci_is_bridge(dev)) {
> +		retval = of_platform_populate(dev->dev.of_node, NULL, NULL,
> +					      &dev->dev);
> +		if (retval)
> +			pci_err(dev, "failed to populate child OF nodes (%d)\n",
> +				retval);
> +	}
>  }
>  EXPORT_SYMBOL_GPL(pci_bus_add_device);
>  
> diff --git a/drivers/pci/remove.c b/drivers/pci/remove.c
> index d749ea8250d6..910387e5bdbf 100644
> --- a/drivers/pci/remove.c
> +++ b/drivers/pci/remove.c
> @@ -1,6 +1,7 @@
>  // SPDX-License-Identifier: GPL-2.0
>  #include <linux/pci.h>
>  #include <linux/module.h>
> +#include <linux/of_platform.h>
>  #include "pci.h"
>  
>  static void pci_free_resources(struct pci_dev *dev)
> @@ -18,7 +19,7 @@ static void pci_stop_dev(struct pci_dev *dev)
>  	pci_pme_active(dev, false);
>  
>  	if (pci_dev_is_added(dev)) {
> -
> +		of_platform_depopulate(&dev->dev);
>  		device_release_driver(&dev->dev);
>  		pci_proc_detach_device(dev);
>  		pci_remove_sysfs_dev_files(dev);
> 
> -- 
> 2.43.0
>