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| author |   Jon Smirl <jonsmirl@gmail.com> | 2009-01-09 15:49:06 -0700 |
|---|---|---|
| committer |   Grant Likely <grant.likely@secretlab.ca> | 2009-01-09 15:49:06 -0700 |
| commit | 2526c151c31358aec66b63921dd712bbec5ee0cb (patch) | |
| tree | ee1cd5878c6970d469e348f2440c5d0074def379 /drivers/of | |
| parent | powerpc/xsysace: add compatible string for non-ipcore instance (diff) | |
| download | linux-dev-2526c151c31358aec66b63921dd712bbec5ee0cb.tar.xz linux-dev-2526c151c31358aec66b63921dd712bbec5ee0cb.zip | |
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: Jon Smirl <jonsmirl@gmail.com>
Signed-off-by: Grant Likely <grant.likely@secretlab.ca>
Diffstat (limited to 'drivers/of')
| -rw-r--r-- | drivers/of/of_i2c.c | 19 |
1 files changed, 19 insertions, 0 deletions
diff --git a/drivers/of/of_i2c.c b/drivers/of/of_i2c.c index e1b0ad6e918f..fa65a2b2ae2e 100644 --- a/drivers/of/of_i2c.c +++ b/drivers/of/of_i2c.c @@ -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"); |