diff mbox series

[v8,14/17] PCI/pwrctl: create platform devices for child OF nodes of the port node

Message ID 20240528-pwrseq-v8-14-d354d52b763c@linaro.org
State New
Headers show
Series power: sequencing: implement the subsystem and add first users | expand

Commit Message

Bartosz Golaszewski May 28, 2024, 7:03 p.m. UTC
From: Bartosz Golaszewski <bartosz.golaszewski@linaro.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@linaro.org>
Signed-off-by: Bartosz Golaszewski <bartosz.golaszewski@linaro.org>
---
 drivers/pci/bus.c    | 9 +++++++++
 drivers/pci/remove.c | 3 ++-
 2 files changed, 11 insertions(+), 1 deletion(-)

Comments

Bjorn Helgaas June 11, 2024, 10:56 p.m. UTC | #1
On Tue, May 28, 2024 at 09:03:22PM +0200, Bartosz Golaszewski wrote:
> From: Bartosz Golaszewski <bartosz.golaszewski@linaro.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@linaro.org>
> Signed-off-by: Bartosz Golaszewski <bartosz.golaszewski@linaro.org>

With s/create/Create/ in subject,

Acked-by: Bjorn Helgaas <bhelgaas@google.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
>
diff mbox series

Patch

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);