On Wed, Feb 21, 2018 at 10:55 AM, Andrzej Hajda [off-list ref] wrote:

Since extcon property is not allowed in DT, extcon subsystem requires
another way to get extcon device. Lets try the simplest approach - get
edev by of_node.

+/*
+ * extcon_get_edev_by_of_node - Get the extcon device from devicetree.
+ * @node       : OF node identyfying edev
+ *
+ * Return the pointer of extcon device if success or ERR_PTR(err) if fail.
+ */
+struct extcon_dev *extcon_get_edev_by_of_node(struct device_node *node)

First of all, the all other similar cases use "_by_node" in the name.
Second, it's not _get_, it's _find_.

+{
+       struct extcon_dev *edev;
+
+       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)
+                       goto out;
+       edev = ERR_PTR(-EPROBE_DEFER);
+out:
+       mutex_unlock(&extcon_dev_list_lock);
+
+       return edev;

Can't it be done using bus_find_device()?

+}

See good example in i2c-core-of.c

of_find_i2c_adapter_by_node()
of_get_i2c_adapter_by_node()

-- 
With Best Regards,
Andy Shevchenko