summaryrefslogtreecommitdiff
path: root/drivers/net/phy/micrel.c
diff options
context:
space:
mode:
authorSylvain Rochet <sylvain.rochet@finsecur.com>2015-10-07 22:54:22 +0200
committerJoe Hershberger <joe.hershberger@ni.com>2015-10-29 14:05:48 -0500
commit4f485150cfdc1cbbf841e46236dd5052fbe5c542 (patch)
treebff197a80421d61c90fb1ee394917c5461f8c155 /drivers/net/phy/micrel.c
parentf3ba55235dddb11bbb615669b43688f4c1b73f69 (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/net/phy/micrel.c')
-rw-r--r--drivers/net/phy/micrel.c29
1 files changed, 29 insertions, 0 deletions
diff --git a/drivers/net/phy/micrel.c b/drivers/net/phy/micrel.c
index cbec928ce4..5e49666bbb 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);