From da9f33018e2c0b2f341cb574e3c08363e3b0dd28 Mon Sep 17 00:00:00 2001 From: Andrew Lunn Date: Wed, 1 Feb 2017 03:40:05 +0100 Subject: [PATCH] net: dsa: mv88e6xxx: Workaround missing PHY ID on mv88e6390 The internal PHYs of the mv88e6390 do not have a model ID. Trap any calls to the ID register, and if it is zero, return the ID for the mv88e6390. The Marvell PHY driver can then bind to this ID. Signed-off-by: Andrew Lunn Reviewed-by: Florian Fainelli Reviewed-by: Vivien Didelot Signed-off-by: David S. Miller --- drivers/net/dsa/mv88e6xxx/chip.c | 8 ++++++++ 1 file changed, 8 insertions(+) diff --git a/drivers/net/dsa/mv88e6xxx/chip.c b/drivers/net/dsa/mv88e6xxx/chip.c index bf385377a461..29190303ace0 100644 --- a/drivers/net/dsa/mv88e6xxx/chip.c +++ b/drivers/net/dsa/mv88e6xxx/chip.c @@ -2930,6 +2930,14 @@ static int mv88e6xxx_mdio_read(struct mii_bus *bus, int phy, int reg) err = chip->info->ops->phy_read(chip, bus, phy, reg, &val); mutex_unlock(&chip->reg_lock); + if (reg == MII_PHYSID2) { + /* Some internal PHYS don't have a model number. Use + * the mv88e6390 family model number instead. + */ + if (!(val & 0x3f0)) + val |= PORT_SWITCH_ID_PROD_NUM_6390; + } + return err ? err : val; }