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Add the of_find_i2c_device_by_node function.

PATCH In review Jon Smirl 1 participant 2 messages Dec 30, 2008 – Jan 6, 2009 Device tree

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Jon Smirl

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#0 lore raw

PATCH 1/1 Add the of_find_i2c_device_by_node function.

Add the of_find_i2c_device_by_node function. This 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 codec controlled by i2c.

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

Signed-off-by Jon Smirl <[email protected]>
---
 drivers/of/of_i2c.c    |   19 +++++++++++++++++++
 include/linux/of_i2c.h |    3 +++
 2 files changed, 22 insertions(+), 0 deletions(-)
drivers/of/of_i2c.c +19 -0
index e1b0ad6..fa65a2b 100644
@@ -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
index bd2a870..34974b5 100644
@@ -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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#1 lore raw
Quoted 4 lines · Jon Smirl

Add the of_find_i2c_device_by_node function. This 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 codec controlled by i2c.

Did anyone pick this patch up? You need it to write ALSA ASOC drivers.

Signature · 2 lines
Jon Smirl
[email protected]