From 2526c151c31358aec66b63921dd712bbec5ee0cb Mon Sep 17 00:00:00 2001 From: Jon Smirl Date: Fri, 9 Jan 2009 15:49:06 -0700 Subject: [PATCH] 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 Signed-off-by: Grant Likely --- drivers/of/of_i2c.c | 19 +++++++++++++++++++ include/linux/of_i2c.h | 3 +++ 2 files changed, 22 insertions(+) diff --git a/drivers/of/of_i2c.c b/drivers/of/of_i2c.c index e1b0ad6e918..fa65a2b2ae2 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"); diff --git a/include/linux/of_i2c.h b/include/linux/of_i2c.h index bd2a870ec29..34974b5a76f 100644 --- a/include/linux/of_i2c.h +++ b/include/linux/of_i2c.h @@ -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 */