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From: Saravana Kannan <saravanak@google.com>
To: Rob Herring <robh+dt@kernel.org>,
	Mark Rutland <mark.rutland@arm.com>,
	Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
	"Rafael J. Wysocki" <rafael@kernel.org>,
	Frank Rowand <frowand.list@gmail.com>,
	Jonathan Corbet <corbet@lwn.net>, Len Brown <lenb@kernel.org>
Cc: Saravana Kannan <saravanak@google.com>,
	devicetree@vger.kernel.org, linux-kernel@vger.kernel.org,
	linux-doc@vger.kernel.org, linux-acpi@vger.kernel.org,
	clang-built-linux@googlegroups.com,
	David Collins <collinsd@codeaurora.org>,
	kernel-team@android.com
Subject: [PATCH v11 1/6] driver core: Add fwnode_to_dev() to look up device from fwnode
Date: Wed,  4 Sep 2019 14:11:20 -0700	[thread overview]
Message-ID: <20190904211126.47518-2-saravanak@google.com> (raw)
In-Reply-To: <20190904211126.47518-1-saravanak@google.com>

It's often useful to look up a device that corresponds to a fwnode. So
add an API to do that irrespective of the bus on which the device has
been added to.

Signed-off-by: Saravana Kannan <saravanak@google.com>
---
 drivers/base/core.c    | 7 +++++++
 include/linux/fwnode.h | 2 ++
 2 files changed, 9 insertions(+)

diff --git a/drivers/base/core.c b/drivers/base/core.c
index 2db62d98e395..510fabf8918c 100644
--- a/drivers/base/core.c
+++ b/drivers/base/core.c
@@ -2198,6 +2198,10 @@ int device_add(struct device *dev)
 					     BUS_NOTIFY_ADD_DEVICE, dev);
 
 	kobject_uevent(&dev->kobj, KOBJ_ADD);
+
+	if (dev->fwnode && !dev->fwnode->dev)
+		dev->fwnode->dev = dev;
+
 	bus_probe_device(dev);
 	if (parent)
 		klist_add_tail(&dev->p->knode_parent,
@@ -2342,6 +2346,9 @@ void device_del(struct device *dev)
 	kill_device(dev);
 	device_unlock(dev);
 
+	if (dev->fwnode && dev->fwnode->dev == dev)
+		dev->fwnode->dev = NULL;
+
 	/* Notify clients of device removal.  This call must come
 	 * before dpm_sysfs_remove().
 	 */
diff --git a/include/linux/fwnode.h b/include/linux/fwnode.h
index ababd6bc82f3..d8c6d231d577 100644
--- a/include/linux/fwnode.h
+++ b/include/linux/fwnode.h
@@ -17,6 +17,7 @@ struct device;
 struct fwnode_handle {
 	struct fwnode_handle *secondary;
 	const struct fwnode_operations *ops;
+	struct device *dev;
 };
 
 /**
@@ -123,5 +124,6 @@ struct fwnode_operations {
 		if (fwnode_has_op(fwnode, op))				\
 			(fwnode)->ops->op(fwnode, ## __VA_ARGS__);	\
 	} while (false)
+#define get_dev_from_fwnode(fwnode)	get_device((fwnode)->dev)
 
 #endif
-- 
2.23.0.187.g17f5b7556c-goog


  reply	other threads:[~2019-09-04 21:11 UTC|newest]

Thread overview: 15+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-09-04 21:11 [PATCH v11 0/6] Solve postboot supplier cleanup and optimize probe ordering Saravana Kannan
2019-09-04 21:11 ` Saravana Kannan [this message]
2019-09-04 21:11 ` [PATCH v11 2/6] driver core: Add support for linking devices during device addition Saravana Kannan
2019-09-04 21:11 ` [PATCH v11 3/6] of: property: Add functional dependency link from DT bindings Saravana Kannan
2019-09-11 10:29   ` Stephen Boyd
2019-10-04 15:37     ` Greg Kroah-Hartman
2019-10-04 23:46       ` Saravana Kannan
2019-10-08 14:53       ` Stephen Boyd
2019-10-08 18:57         ` Saravana Kannan
2019-10-16 20:15           ` Stephen Boyd
2019-09-04 21:11 ` [PATCH v11 4/6] driver core: Add sync_state driver/bus callback Saravana Kannan
2019-09-04 21:11 ` [PATCH v11 5/6] of/platform: Pause/resume sync state during init and of_platform_populate() Saravana Kannan
2019-09-04 21:11 ` [PATCH v11 6/6] of: property: Create device links for all child-supplier depencencies Saravana Kannan
2019-09-11 10:34 ` [PATCH v11 0/6] Solve postboot supplier cleanup and optimize probe ordering Stephen Boyd
2019-10-04 15:34 ` Greg Kroah-Hartman

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