[PATCH v3 1/2] Driver core: add bus_find_device_by_fwnode
From: rafael@kernel.org (Rafael J. Wysocki)
Date: 2018-10-09 10:20:46
Also in:
linux-devicetree, linux-i2c, linux-rdma, linux-spi, lkml, netdev
On Tue, Oct 9, 2018 at 12:18 PM Silesh C V [off-list ref] wrote:
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 <redacted>
Reviewed-by: Rafael J. Wysocki <redacted>
quoted hunk ↗ jump to hunk
--- Changes since v2: - make use of dev_fwnode in match_fwnode. drivers/base/bus.c | 20 ++++++++++++++++++++ include/linux/device.h | 3 +++ 2 files changed, 23 insertions(+)diff --git a/drivers/base/bus.c b/drivers/base/bus.c index 8bfd27e..a2f39db 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/property.h> #include "base.h" #include "power/power.h"@@ -373,6 +374,25 @@ 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 *fwnode) +{ + return dev_fwnode(dev) == 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: subsystemdiff --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