miiphy: constify device name

The driver name does not need to be writable, so constify it.

Signed-off-by: Mike Frysinger <vapier@gentoo.org>
Signed-off-by: Ben Warren <biggerbadderben@gmail.com>
diff --git a/drivers/net/tsec.c b/drivers/net/tsec.c
index 54c4a70..9b5dd92 100644
--- a/drivers/net/tsec.c
+++ b/drivers/net/tsec.c
@@ -60,9 +60,9 @@
 static void adjust_link(struct eth_device *dev);
 #if defined(CONFIG_MII) || defined(CONFIG_CMD_MII) \
 	&& !defined(BITBANGMII)
-static int tsec_miiphy_write(char *devname, unsigned char addr,
+static int tsec_miiphy_write(const char *devname, unsigned char addr,
 			     unsigned char reg, unsigned short value);
-static int tsec_miiphy_read(char *devname, unsigned char addr,
+static int tsec_miiphy_read(const char *devname, unsigned char addr,
 			    unsigned char reg, unsigned short *value);
 #endif
 #ifdef CONFIG_MCAST_TFTP
@@ -1919,7 +1919,7 @@
  * Returns:
  *  0 on success
  */
-static int tsec_miiphy_read(char *devname, unsigned char addr,
+static int tsec_miiphy_read(const char *devname, unsigned char addr,
 			    unsigned char reg, unsigned short *value)
 {
 	unsigned short ret;
@@ -1942,7 +1942,7 @@
  * Returns:
  *  0 on success
  */
-static int tsec_miiphy_write(char *devname, unsigned char addr,
+static int tsec_miiphy_write(const char *devname, unsigned char addr,
 			     unsigned char reg, unsigned short value)
 {
 	struct tsec_private *priv = privlist[0];