[PATCH net v2] net: phy: broadcom: stub c45 read/write for 54810

[Justin Chen <justin.chen@broadcom.com>]

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The 54810 does not support c45. The mmd_phy_indirect accesses return
arbirtary values leading to odd behavior like saying it supports EEE
when it doesn't. We also see that reading/writing these non-existent
MMD registers leads to phy instability in some cases.

Fixes: b14995ac2527 ("net: phy: broadcom: Add BCM54810 PHY entry")
Signed-off-by: Justin Chen <justin.chen@broadcom.com>
---
v2
	- Change EINVAL to EOPNOTSUPP
 
 drivers/net/phy/broadcom.c | 13 +++++++++++++
 1 file changed, 13 insertions(+)

diff --git a/drivers/net/phy/broadcom.c b/drivers/net/phy/broadcom.c
index 59cae0d808aa..04b2e6eeb195 100644
--- a/drivers/net/phy/broadcom.c
+++ b/drivers/net/phy/broadcom.c
@@ -542,6 +542,17 @@ static int bcm54xx_resume(struct phy_device *phydev)
 	return bcm54xx_config_init(phydev);
 }
 
+static int bcm54810_read_mmd(struct phy_device *phydev, int devnum, u16 regnum)
+{
+	return -EOPNOTSUPP;
+}
+
+static int bcm54810_write_mmd(struct phy_device *phydev, int devnum, u16 regnum,
+			      u16 val)
+{
+	return -EOPNOTSUPP;
+}
+
 static int bcm54811_config_init(struct phy_device *phydev)
 {
 	int err, reg;
@@ -1103,6 +1114,8 @@ static struct phy_driver broadcom_drivers[] = {
 	.get_strings	= bcm_phy_get_strings,
 	.get_stats	= bcm54xx_get_stats,
 	.probe		= bcm54xx_phy_probe,
+	.read_mmd	= bcm54810_read_mmd,
+	.write_mmd	= bcm54810_write_mmd,
 	.config_init    = bcm54xx_config_init,
 	.config_aneg    = bcm5481_config_aneg,
 	.config_intr    = bcm_phy_config_intr,
-- 
2.7.4


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