net: phy: re-design phy_modes to be self-contained

of_get_phy_mode() uses a local array to map phy_interface_t values from
include/linux/net/phy.h to a string which is read from the 'phy-mode' or
'phy-connection-type' property. In preparation for exposing the PHY
interface mode through sysfs, perform the following:

- mode phy_modes from drivers/of/of_net.c to include/linux/phy.h such
  that it is right below the phy_interface_t enum
- make it a static inline function returning the string such that we can
  use it by just including include/linux/net/phy.h
- add a PHY_INTERFACE_MODE_MAX enum value to guard the iteration in
  of_get_phy_mode()

Signed-off-by: Florian Fainelli <f.fainelli@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/of/of_net.c

@@ -11,28 +11,6 @@
 #include <linux/phy.h>
 #include <linux/export.h>
 
-/**
- * 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.
- */
-static const char *phy_modes[] = {
-	[PHY_INTERFACE_MODE_NA]		= "",
-	[PHY_INTERFACE_MODE_MII]	= "mii",
-	[PHY_INTERFACE_MODE_GMII]	= "gmii",
-	[PHY_INTERFACE_MODE_SGMII]	= "sgmii",
-	[PHY_INTERFACE_MODE_TBI]	= "tbi",
-	[PHY_INTERFACE_MODE_REVMII]	= "rev-mii",
-	[PHY_INTERFACE_MODE_RMII]	= "rmii",
-	[PHY_INTERFACE_MODE_RGMII]	= "rgmii",
-	[PHY_INTERFACE_MODE_RGMII_ID]	= "rgmii-id",
-	[PHY_INTERFACE_MODE_RGMII_RXID]	= "rgmii-rxid",
-	[PHY_INTERFACE_MODE_RGMII_TXID] = "rgmii-txid",
-	[PHY_INTERFACE_MODE_RTBI]	= "rtbi",
-	[PHY_INTERFACE_MODE_SMII]	= "smii",
-	[PHY_INTERFACE_MODE_XGMII]	= "xgmii",
-};
-
 /**
  * of_get_phy_mode - Get phy mode for given device_node
  * @np:	Pointer to the given device_node
@@ -49,8 +27,8 @@ int of_get_phy_mode(struct device_node *np)
 	if (err < 0)
 		return err;
 
-	for (i = 0; i < ARRAY_SIZE(phy_modes); i++)
-		if (!strcasecmp(pm, phy_modes[i]))
+	for (i = 0; i < PHY_INTERFACE_MODE_MAX; i++)
+		if (!strcasecmp(pm, phy_modes(i)))
 			return i;
 
 	return -ENODEV;

include/linux/phy.h

@@ -74,8 +74,50 @@ typedef enum {
 	PHY_INTERFACE_MODE_RTBI,
 	PHY_INTERFACE_MODE_SMII,
 	PHY_INTERFACE_MODE_XGMII,
+	PHY_INTERFACE_MODE_MAX,
 } phy_interface_t;
 
+/**
+ * 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.
+ */
+static inline const char *phy_modes(phy_interface_t interface)
+{
+	switch (interface) {
+	case PHY_INTERFACE_MODE_NA:
+		return "";
+	case PHY_INTERFACE_MODE_MII:
+		return "mii";
+	case PHY_INTERFACE_MODE_GMII:
+		return "gmii";
+	case PHY_INTERFACE_MODE_SGMII:
+		return "sgmii";
+	case PHY_INTERFACE_MODE_TBI:
+		return "tbi";
+	case PHY_INTERFACE_MODE_REVMII:
+		return "rev-mii";
+	case PHY_INTERFACE_MODE_RMII:
+		return "rmii";
+	case PHY_INTERFACE_MODE_RGMII:
+		return "rgmii";
+	case PHY_INTERFACE_MODE_RGMII_ID:
+		return "rgmii-id";
+	case PHY_INTERFACE_MODE_RGMII_RXID:
+		return "rgmii-rxid";
+	case PHY_INTERFACE_MODE_RGMII_TXID:
+		return "rgmii-txid";
+	case PHY_INTERFACE_MODE_RTBI:
+		return "rtbi";
+	case PHY_INTERFACE_MODE_SMII:
+		return "smii";
+	case PHY_INTERFACE_MODE_XGMII:
+		return "xgmii";
+	default:
+		return "unknown";
+	}
+}
+
 
 #define PHY_INIT_TIMEOUT	100000
 #define PHY_STATE_TIME		1