From 0938643e533cc80ef0cdfdd2e260c4910d0f8bc7 Mon Sep 17 00:00:00 2001
From: Stephen Warren <swarren@nvidia.com>
Date: Tue, 17 Apr 2012 12:43:34 -0600
Subject: [PATCH] of/i2c: implement of_find_i2c_adapter_by_node
This finds the struct i2c_adapter * for a given device tree node. Just
like of_find_i2c_device_by_node.
Signed-off-by: Stephen Warren <swarren@nvidia.com>
Signed-off-by: Wolfram Sang <w.sang@pengutronix.de>
---
drivers/of/of_i2c.c | 14 ++++++++++++++
include/linux/of_i2c.h | 4 ++++
2 files changed, 18 insertions(+)
diff --git a/drivers/of/of_i2c.c b/drivers/of/of_i2c.c
index 068488717f69..1e173f357674 100644
--- a/drivers/of/of_i2c.c
+++ b/drivers/of/of_i2c.c
@@ -94,4 +94,18 @@ struct i2c_client *of_find_i2c_device_by_node(struct device_node *node)
}
EXPORT_SYMBOL(of_find_i2c_device_by_node);
+/* must call put_device() when done with returned i2c_adapter device */
+struct i2c_adapter *of_find_i2c_adapter_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 i2c_verify_adapter(dev);
+}
+EXPORT_SYMBOL(of_find_i2c_adapter_by_node);
+
MODULE_LICENSE("GPL");
diff --git a/include/linux/of_i2c.h b/include/linux/of_i2c.h
index 0efe8d465f55..1cb775f8e663 100644
--- a/include/linux/of_i2c.h
+++ b/include/linux/of_i2c.h
@@ -20,6 +20,10 @@ extern void of_i2c_register_devices(struct i2c_adapter *adap);
/* must call put_device() when done with returned i2c_client device */
extern struct i2c_client *of_find_i2c_device_by_node(struct device_node *node);
+/* must call put_device() when done with returned i2c_adapter device */
+extern struct i2c_adapter *of_find_i2c_adapter_by_node(
+ struct device_node *node);
+
#else
static inline void of_i2c_register_devices(struct i2c_adapter *adap)
{
--
2.34.1