extcon: Implement OF-based extcon lookup properly

Platform bus is not the only way to have extcon devices, so current
implementation of of_extcon_get_extcon_dev() is broken. Also using
parent device node only to get device name is quite ugly.

This patch reimplements of_extcon_get_extcon_dev() to do exactly the
same as extcon_get_extcon_dev() but instead of comparing names, compare
node pointers.

Signed-off-by: Tomasz Figa <tomasz.figa@gmail.com>
[mszyprow: simplified the code]
Signed-off-by: Marek Szyprowski <m.szyprowski@samsung.com>
Signed-off-by: Chanwoo Choi <cw00.choi@samsung.com>

1 files changed, 9 insertions, 5 deletions

diff --git a/drivers/extcon/extcon-class.c b/drivers/extcon/extcon-class.c
index 4c2f2c543bb7..043dcd9946c9 100644
--- a/drivers/extcon/extcon-class.c
+++ b/drivers/extcon/extcon-class.c
@@ -29,6 +29,7 @@
 #include <linux/fs.h>
 #include <linux/err.h>
 #include <linux/extcon.h>
+#include <linux/of.h>
 #include <linux/slab.h>
 #include <linux/sysfs.h>
 #include <linux/of.h>
@@ -997,13 +998,16 @@ struct extcon_dev *extcon_get_edev_by_phandle(struct device *dev, int index)
                 return ERR_PTR(-ENODEV);
         }
 
-        edev = extcon_get_extcon_dev(node->name);
-        if (!edev) {
-                dev_err(dev, "unable to get extcon device : %s\n", node->name);
-                return ERR_PTR(-ENODEV);
+        mutex_lock(&extcon_dev_list_lock);
+        list_for_each_entry(edev, &extcon_dev_list, entry) {
+                if (edev->dev.parent && edev->dev.parent->of_node == node) {
+                        mutex_unlock(&extcon_dev_list_lock);
+                        return edev;
+                }
         }
+        mutex_unlock(&extcon_dev_list_lock);
 
-        return edev;
+        return ERR_PTR(-EPROBE_DEFER);
 }
 #else
 struct extcon_dev *extcon_get_edev_by_phandle(struct device *dev, int index)