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

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Date: Tue, 28 May 2024 21:03:22 +0200
From: Bartosz Golaszewski <brgl@...ev.pl>
To: 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>, 
 Bartosz Golaszewski <brgl@...ev.pl>, 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>
Cc: 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: [PATCH v8 14/17] PCI/pwrctl: create platform devices for child OF
 nodes of the port node

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>
---
 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