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Commit 2526c151 authored by Jon Smirl's avatar Jon Smirl Committed by Grant Likely
Browse files

drivers/of: Add the of_find_i2c_device_by_node function. 



The of_find_i2c_device_by_node function allows you to follow a
reference in the device tree to an i2c device node and then locate
the linux device instantiated by the device tree. Example use: an I2S
bus driver finding the i2c_device instance for a codec described by
a device tree node.

This was waiting for Anton's i2c patches that were just added.

Signed-off-by: default avatarJon Smirl <jonsmirl@gmail.com>
Signed-off-by: default avatarGrant Likely <grant.likely@secretlab.ca>
parent f5020384

drivers/of/of_i2c.c

+19 −0
Original line number Diff line number Diff line
@@ -66,4 +66,23 @@ void of_register_i2c_devices(struct i2c_adapter *adap, 
}

EXPORT_SYMBOL(of_register_i2c_devices);



static int of_dev_node_match(struct device *dev, void *data)

{

        return dev_archdata_get_node(&dev->archdata) == data;

}



/* must call put_device() when done with returned i2c_client device */

struct i2c_client *of_find_i2c_device_by_node(struct device_node *node)

{

	struct device *dev;



	dev = bus_find_device(&i2c_bus_type, NULL, node,

					 of_dev_node_match);

	if (!dev)

		return NULL;



	return to_i2c_client(dev);

}

EXPORT_SYMBOL(of_find_i2c_device_by_node);



MODULE_LICENSE("GPL");

include/linux/of_i2c.h

+3 −0
Original line number Diff line number Diff line
@@ -17,4 +17,7 @@ 
void of_register_i2c_devices(struct i2c_adapter *adap,

			     struct device_node *adap_node);



/* must call put_device() when done with returned i2c_client device */

struct i2c_client *of_find_i2c_device_by_node(struct device_node *node);



#endif /* __LINUX_OF_I2C_H */