[PATCH master 6/8] net: phy: fix of_get_phy_mode for XLGMII and beyond

[Ahmad Fatoum <a.fatoum@pengutronix.de>]

The phy_modes array needs to be kept in-sync with the
enum phy_interface_t, but this was violated by the most recent sync of
the enum type with Linux.

Th addition of new enumeration constants between existing ones resulted
in phy_modes having NULL-valued gaps, which would panic when passed
to strcmp.

Fix this by replacing the current sparse array, with a function that
always returns a string value. This is what Linux currently does.

Fixes: 63eb097f6639 ("net/phy: sync phy_interface_t types with Linux")
Signed-off-by: Ahmad Fatoum <a.fatoum@pengutronix.de>
---
v1 -> v2:
  - new patch
---
 drivers/of/of_net.c | 36 ++------------------
 include/linux/phy.h | 82 +++++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 84 insertions(+), 34 deletions(-)

diff --git a/drivers/of/of_net.c b/drivers/of/of_net.c
index 58b4f99da111..d66de875316d 100644
--- a/drivers/of/of_net.c
+++ b/drivers/of/of_net.c
@@ -10,38 +10,6 @@
 #include <linux/phy.h>
 #include <linux/nvmem-consumer.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_INTERNAL]	= "internal",
-	[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_REVRMII]	= "rev-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",
-	[PHY_INTERFACE_MODE_MOCA]	= "moca",
-	[PHY_INTERFACE_MODE_QSGMII]	= "qsgmii",
-	[PHY_INTERFACE_MODE_TRGMII]	= "trgmii",
-	[PHY_INTERFACE_MODE_1000BASEX]	= "1000base-x",
-	[PHY_INTERFACE_MODE_2500BASEX]	= "2500base-x",
-	[PHY_INTERFACE_MODE_RXAUI]	= "rxaui",
-	[PHY_INTERFACE_MODE_XAUI]	= "xaui",
-	[PHY_INTERFACE_MODE_10GKR]	= "10gbase-kr",
-};
-
 /**
  * of_get_phy_mode - Get phy mode for given device_node
  * @np:	Pointer to the given device_node
@@ -60,8 +28,8 @@ int of_get_phy_mode(struct device_node *np)
 	if (err < 0)
 		return err;
 
-	for (i = 0; i < ARRAY_SIZE(phy_modes); i++)
-		if (!strcmp(pm, phy_modes[i]))
+	for (i = 0; i < PHY_INTERFACE_MODE_MAX; i++)
+		if (!strcasecmp(pm, phy_modes(i)))
 			return i;
 
 	return -ENODEV;
diff --git a/include/linux/phy.h b/include/linux/phy.h
index d8e53d446ef5..5cbd21f91a50 100644
--- a/include/linux/phy.h
+++ b/include/linux/phy.h
@@ -115,6 +115,88 @@ typedef enum {
 	PHY_INTERFACE_MODE_MAX,
 } phy_interface_t;
 
+/**
+ * phy_modes - map phy_interface_t enum to device tree binding of phy-mode
+ * @interface: enum phy_interface_t value
+ *
+ * Description: maps enum &phy_interface_t defined in this file
+ * 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_INTERNAL:
+		return "internal";
+	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_REVRMII:
+		return "rev-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";
+	case PHY_INTERFACE_MODE_XLGMII:
+		return "xlgmii";
+	case PHY_INTERFACE_MODE_MOCA:
+		return "moca";
+	case PHY_INTERFACE_MODE_PSGMII:
+		return "psgmii";
+	case PHY_INTERFACE_MODE_QSGMII:
+		return "qsgmii";
+	case PHY_INTERFACE_MODE_TRGMII:
+		return "trgmii";
+	case PHY_INTERFACE_MODE_1000BASEX:
+		return "1000base-x";
+	case PHY_INTERFACE_MODE_1000BASEKX:
+		return "1000base-kx";
+	case PHY_INTERFACE_MODE_2500BASEX:
+		return "2500base-x";
+	case PHY_INTERFACE_MODE_5GBASER:
+		return "5gbase-r";
+	case PHY_INTERFACE_MODE_RXAUI:
+		return "rxaui";
+	case PHY_INTERFACE_MODE_XAUI:
+		return "xaui";
+	case PHY_INTERFACE_MODE_10GBASER:
+		return "10gbase-r";
+	case PHY_INTERFACE_MODE_25GBASER:
+		return "25gbase-r";
+	case PHY_INTERFACE_MODE_USXGMII:
+		return "usxgmii";
+	case PHY_INTERFACE_MODE_10GKR:
+		return "10gbase-kr";
+	case PHY_INTERFACE_MODE_100BASEX:
+		return "100base-x";
+	case PHY_INTERFACE_MODE_QUSGMII:
+		return "qusgmii";
+	default:
+		return "unknown";
+	}
+}
+
 #define PHY_INIT_TIMEOUT	100000
 #define PHY_FORCE_TIMEOUT	10
 #define PHY_AN_TIMEOUT		10
-- 
2.39.5