drivers/of: Add the of_find_i2c_device_by_node function. (2526c151) · Commits · 戴 / test

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:

Jon Smirl <jonsmirl@gmail.com> Signed-off-by:

Grant Likely <grant.likely@secretlab.ca>

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 */

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