i2c/of: Allow device node to be passed via i2c_board_info

The struct device_node *of_node pointer is moving out of dev->archdata
and into the struct device proper.  of_i2c.c needs to set the of_node
pointer before the device is registered.  Since the i2c subsystem
doesn't allow 2 stage allocation and registration of i2c devices, the
of_node pointer needs to be passed via the i2c_board_info structure
so that it is set prior to registration.

This patch adds of_node to struct i2c_board_info (conditional on
CONFIG_OF), sets of_node in i2c_new_device(), and modifies of_i2c.c
to use the new parameter.  The calling of dev_archdata_set_node()
from of_i2c will be removed in a subsequent patch when of_node is
removed from archdata and all users are converted over.

Signed-off-by: Grant Likely <grant.likely@secretlab.ca>

3 files changed, 8 insertions, 0 deletions

diff --git a/drivers/i2c/i2c-core.c b/drivers/i2c/i2c-core.c
index 3202a86f420e..4099b2b8c392 100644
--- a/drivers/i2c/i2c-core.c
+++ b/drivers/i2c/i2c-core.c
@@ -387,6 +387,9 @@ i2c_new_device(struct i2c_adapter *adap, struct i2c_board_info const *info)
         client->dev.parent = &client->adapter->dev;
         client->dev.bus = &i2c_bus_type;
         client->dev.type = &i2c_client_type;
+#ifdef CONFIG_OF
+        client->dev.of_node = info->of_node;
+#endif
 
         dev_set_name(&client->dev, "%d-%04x", i2c_adapter_id(adap),
                      client->addr);
diff --git a/drivers/of/of_i2c.c b/drivers/of/of_i2c.c
index a3a708e590d0..e690a2aa6fef 100644
--- a/drivers/of/of_i2c.c
+++ b/drivers/of/of_i2c.c
@@ -43,6 +43,7 @@ void of_register_i2c_devices(struct i2c_adapter *adap,
                 info.addr = be32_to_cpup(addr);
 
                 dev_archdata_set_node(&dev_ad, node);
+                info.of_node = node;
                 info.archdata = &dev_ad;
 
                 request_module("%s", info.type);
diff --git a/include/linux/i2c.h b/include/linux/i2c.h
index 0a5da639b327..4f37ff1de7e1 100644
--- a/include/linux/i2c.h
+++ b/include/linux/i2c.h
@@ -34,6 +34,7 @@
 #include <linux/device.h>       /* for struct device */
 #include <linux/sched.h>        /* for completion */
 #include <linux/mutex.h>
+#include <linux/of.h>           /* for struct device_node */
 
 extern struct bus_type i2c_bus_type;
 
@@ -251,6 +252,9 @@ struct i2c_board_info {
         unsigned short  addr;
         void            *platform_data;
         struct dev_archdata     *archdata;
+#ifdef CONFIG_OF
+        struct device_node *of_node;
+#endif
         int             irq;
 };