From: Silesh C V <svellattu@mvista.com>
To: Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
"Rafael J. Wysocki" <rafael@kernel.org>
Cc: linux-kernel@vger.kernel.org, Rob Herring <robh+dt@kernel.org>,
Frank Rowand <frowand.list@gmail.com>,
Silesh C V <svellattu@mvista.com>
Subject: [PATCH v2 1/2] Driver core: add bus_find_device_by_fwnode
Date: Tue, 25 Sep 2018 10:58:47 +0530 [thread overview]
Message-ID: <1537853328-1282-1-git-send-email-svellattu@mvista.com> (raw)
Some drivers need to find the device on a bus having a specific firmware
node. Currently, such drivers have their own implementations to do this.
Provide a helper similar to bus_find_device_by_name so that each driver
does not have to reinvent this.
Signed-off-by: Silesh C V <svellattu@mvista.com>
---
drivers/base/bus.c | 26 ++++++++++++++++++++++++++
include/linux/device.h | 3 +++
2 files changed, 29 insertions(+)
diff --git a/drivers/base/bus.c b/drivers/base/bus.c
index 8bfd27e..148b198 100644
--- a/drivers/base/bus.c
+++ b/drivers/base/bus.c
@@ -17,6 +17,7 @@
#include <linux/string.h>
#include <linux/mutex.h>
#include <linux/sysfs.h>
+#include <linux/of.h>
#include "base.h"
#include "power/power.h"
@@ -373,6 +374,31 @@ struct device *bus_find_device_by_name(struct bus_type *bus,
}
EXPORT_SYMBOL_GPL(bus_find_device_by_name);
+static int match_fwnode(struct device *dev, void *data)
+{
+ struct fwnode_handle *fwnode = data;
+ struct device_node *of_node = to_of_node(fwnode);
+
+ if (of_node)
+ return dev->of_node == of_node;
+ else
+ return dev->fwnode == fwnode;
+}
+
+/**
+ * bus_find_device_by_fwnode - device iterator for locating a particular device
+ * having a specific firmware node
+ * @bus: bus type
+ * @start: Device to begin with
+ * @fwnode: firmware node of the device to match
+ */
+struct device *bus_find_device_by_fwnode(struct bus_type *bus, struct device *start,
+ struct fwnode_handle *fwnode)
+{
+ return bus_find_device(bus, start, (void *)fwnode, match_fwnode);
+}
+EXPORT_SYMBOL_GPL(bus_find_device_by_fwnode);
+
/**
* subsys_find_device_by_id - find a device with a specific enumeration number
* @subsys: subsystem
diff --git a/include/linux/device.h b/include/linux/device.h
index 8f88254..09384f6 100644
--- a/include/linux/device.h
+++ b/include/linux/device.h
@@ -171,6 +171,9 @@ struct device *bus_find_device(struct bus_type *bus, struct device *start,
struct device *bus_find_device_by_name(struct bus_type *bus,
struct device *start,
const char *name);
+struct device *bus_find_device_by_fwnode(struct bus_type *bus,
+ struct device *start,
+ struct fwnode_handle *fwnode);
struct device *subsys_find_device_by_id(struct bus_type *bus, unsigned int id,
struct device *hint);
int bus_for_each_drv(struct bus_type *bus, struct device_driver *start,
--
1.9.1
next reply other threads:[~2018-09-25 5:29 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-09-25 5:28 Silesh C V [this message]
2018-09-25 5:28 ` [PATCH v2 2/2] treewide: use bus_find_device_by_fwnode Silesh C V
2018-09-25 7:04 ` Greg Kroah-Hartman
2018-09-25 7:31 ` Silesh C V
2018-09-25 7:41 ` Silesh C V
2018-10-08 8:08 ` Rafael J. Wysocki
2018-10-08 15:45 ` Rob Herring
2018-10-09 3:13 ` Silesh C V
2018-10-08 8:13 ` [PATCH v2 1/2] Driver core: add bus_find_device_by_fwnode Rafael J. Wysocki
2018-10-09 3:11 ` Silesh C V
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