diff options
| author | Sylvain Rochet | 2015-10-07 22:54:22 +0200 |
|---|---|---|
| committer | Joe Hershberger | 2015-10-29 14:05:48 -0500 |
| commit | 4f485150cfdc1cbbf841e46236dd5052fbe5c542 (patch) | |
| tree | bff197a80421d61c90fb1ee394917c5461f8c155 /drivers | |
| parent | f3ba55235dddb11bbb615669b43688f4c1b73f69 (diff) | |
net: phy: micrel: disable NAND-tree for KSZ8051
NAND-tree is used to check wiring between MAC and PHY using NAND gates
on the PHY side, hence the name.
NAND-tree initial status is latched at reset by probing the IRQ pin.
However some devices are sharing the PHY IRQ pin with other peripherals
such as Atmel SAMA5D[34]x-EK boards when using the optional TM7000
display module, therefore they are switching the PHY in NAND-tree test
mode depending on the current IRQ line status at reset.
This patch ensure PHY is not in NAND-tree test mode only for the Micrel
KSZ8051 PHY used by Atmel. There are other Micrel PHY affected but I
doubt they are used on such weird hardware design.
Signed-off-by: Sylvain Rochet <sylvain.rochet@finsecur.com>
Acked-by: Joe Hershberger <joe.hershberger@ni.com>
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/net/phy/micrel.c | 29 |
1 files changed, 29 insertions, 0 deletions
diff --git a/drivers/net/phy/micrel.c b/drivers/net/phy/micrel.c index cbec928ce4b..5e49666bbb3 100644 --- a/drivers/net/phy/micrel.c +++ b/drivers/net/phy/micrel.c @@ -32,6 +32,34 @@ static struct phy_driver KSZ8031_driver = { .shutdown = &genphy_shutdown, }; +/** + * KSZ8051 + */ +#define MII_KSZ8051_PHY_OMSO 0x16 +#define MII_KSZ8051_PHY_OMSO_NAND_TREE_ON (1 << 5) + +static int ksz8051_config(struct phy_device *phydev) +{ + unsigned val; + + /* Disable NAND-tree */ + val = phy_read(phydev, MDIO_DEVAD_NONE, MII_KSZ8051_PHY_OMSO); + val &= ~MII_KSZ8051_PHY_OMSO_NAND_TREE_ON; + phy_write(phydev, MDIO_DEVAD_NONE, MII_KSZ8051_PHY_OMSO, val); + + return genphy_config(phydev); +} + +static struct phy_driver KSZ8051_driver = { + .name = "Micrel KSZ8051", + .uid = 0x221550, + .mask = 0xfffff0, + .features = PHY_BASIC_FEATURES, + .config = &ksz8051_config, + .startup = &genphy_startup, + .shutdown = &genphy_shutdown, +}; + static struct phy_driver KSZ8081_driver = { .name = "Micrel KSZ8081", .uid = 0x221560, @@ -293,6 +321,7 @@ int phy_micrel_init(void) { phy_register(&KSZ804_driver); phy_register(&KSZ8031_driver); + phy_register(&KSZ8051_driver); phy_register(&KSZ8081_driver); #ifdef CONFIG_PHY_MICREL_KSZ9021 phy_register(&ksz9021_driver); |