of: make of_get_phy_mode parse 'phy-connection-type'

Per the ePAPR v1.1 specification, 'phy-connection-type' is the canonical
property name for describing an Ethernet to PHY connection type. Make
sure that of_get_phy_mode() also attempts to parse that property and
update the comments mentioning 'phy-mode' to also include
'phy-connection-type'.
Signed-off-by: Florian Fainelli <f.fainelli@gmail.com>
Signed-off-by: Grant Likely <grant.likely@linaro.org>

drivers/of/of_net.c

@@ -13,8 +13,8 @@
 
 /**
  * It maps 'enum phy_interface_t' found in include/linux/phy.h
- * into the device tree binding of 'phy-mode', so that Ethernet
- * device driver can get phy interface from device tree.
+ * into the device tree binding of 'phy-mode' or 'phy-connection-type',
+ * so that Ethernet device driver can get phy interface from device tree.
  */
 static const char *phy_modes[] = {
 	[PHY_INTERFACE_MODE_NA]		= "",
@@ -37,8 +37,9 @@ static const char *phy_modes[] = {
  * of_get_phy_mode - Get phy mode for given device_node
  * @np:	Pointer to the given device_node
  *
- * The function gets phy interface string from property 'phy-mode',
- * and return its index in phy_modes table, or errno in error case.
+ * The function gets phy interface string from property 'phy-mode' or
+ * 'phy-connection-type', and return its index in phy_modes table, or errno in
+ * error case.
  */
 int of_get_phy_mode(struct device_node *np)
 {
@@ -46,6 +47,8 @@ int of_get_phy_mode(struct device_node *np)
 	int err, i;
 
 	err = of_property_read_string(np, "phy-mode", &pm);
+	if (err < 0)
+		err = of_property_read_string(np, "phy-connection-type", &pm);
 	if (err < 0)
 		return err;