net: libphy: Add stubs to hook IEEE MMD Register reads and writes

The Micrel ksz9021 PHY does not support standard IEEE standard MMD
extended register access, therefore requires stubs to fail the read
register method and do nothing for the write register method when
libphy attempts to read and/or configure Energy Efficient Ethernet
features in PHYS that do support those features. This problem
was observed on an Altera Cyclone V SOC development kit that
uses the Synopsys EMAC and the Micrel ksz9021 PHY. This patch
was tested on the same board, and Energy Efficient Ethernet is
now disabled as expected since the Micrel PHY does not support that
feature.

Signed-off-by: Vince Bridgers <vbridgers2013@gmail.com>
Reviewed-by: Florian Fainelli <f.fainelli@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/phy/micrel.c

@@ -420,6 +420,26 @@ static int ksz8873mll_config_aneg(struct phy_device *phydev)
 	return 0;
 }
 
+/* This routine returns -1 as an indication to the caller that the
+ * Micrel ksz9021 10/100/1000 PHY does not support standard IEEE
+ * MMD extended PHY registers.
+ */
+static int
+ksz9021_rd_mmd_phyreg(struct phy_device *phydev, int ptrad, int devnum,
+		      int regnum)
+{
+	return -1;
+}
+
+/* This routine does nothing since the Micrel ksz9021 does not support
+ * standard IEEE MMD extended PHY registers.
+ */
+static void
+ksz9021_wr_mmd_phyreg(struct phy_device *phydev, int ptrad, int devnum,
+		      int regnum, u32 val)
+{
+}
+
 static struct phy_driver ksphy_driver[] = {
 {
 	.phy_id		= PHY_ID_KS8737,
@@ -565,6 +585,8 @@ static struct phy_driver ksphy_driver[] = {
 	.config_intr	= ksz9021_config_intr,
 	.suspend	= genphy_suspend,
 	.resume		= genphy_resume,
+	.read_mmd_indirect = ksz9021_rd_mmd_phyreg,
+	.write_mmd_indirect = ksz9021_wr_mmd_phyreg,
 	.driver		= { .owner = THIS_MODULE, },
 }, {
 	.phy_id		= PHY_ID_KSZ9031,