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net: phy: micrel: Add KSZ8041FTL fiber mode support 

We can't detect the FXEN (fiber mode) bootstrap pin, so configure
it via a boolean device tree property "micrel,fiber-mode".
If it is enabled, auto-negotiation is not supported.
The only available modes are 100base-fx (full duplex and half duplex).

Signed-off-by: Philipp Zabel <p.zabel@pengutronix.de>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Philipp Zabel 2016-07-14 16:29:43 +02:00 committed by David S. Miller
parent 2f43b9beea
commit 77501a79ce
3 changed files with 43 additions and 2 deletions
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10
Documentation/devicetree/bindings/net/micrel.txt
View File

@ -35,3 +35,13 @@ Optional properties:
supported clocks:
- KSZ8021, KSZ8031, KSZ8081, KSZ8091: "rmii-ref": The RMII reference
input clock. Used to determine the XI input clock.
- micrel,fiber-mode: If present the PHY is configured to operate in fiber mode
Some PHYs, such as the KSZ8041FTL variant, support fiber mode, enabled
by the FXEN boot strapping pin. It can't be determined from the PHY
registers whether the PHY is in fiber mode, so this boolean device tree
property can be used to describe it.
In fiber mode, auto-negotiation is disabled and the PHY can only work in
100base-fx (full and half duplex) modes.

34
drivers/net/phy/micrel.c
View File

@ -311,6 +311,36 @@ static int kszphy_config_init(struct phy_device *phydev)
return 0;
}
static int ksz8041_config_init(struct phy_device *phydev)
{
struct device_node *of_node = phydev->mdio.dev.of_node;
/* Limit supported and advertised modes in fiber mode */
if (of_property_read_bool(of_node, "micrel,fiber-mode")) {
phydev->dev_flags |= MICREL_PHY_FXEN;
phydev->supported &= SUPPORTED_FIBRE |
SUPPORTED_100baseT_Full |
SUPPORTED_100baseT_Half;
phydev->advertising &= ADVERTISED_FIBRE |
ADVERTISED_100baseT_Full |
ADVERTISED_100baseT_Half;
phydev->autoneg = AUTONEG_DISABLE;
}
return kszphy_config_init(phydev);
}
static int ksz8041_config_aneg(struct phy_device *phydev)
{
/* Skip auto-negotiation in fiber mode */
if (phydev->dev_flags & MICREL_PHY_FXEN) {
phydev->speed = SPEED_100;
return 0;
}
return genphy_config_aneg(phydev);
}
static int ksz9021_load_values_from_of(struct phy_device *phydev,
const struct device_node *of_node,
u16 reg,
@ -788,8 +818,8 @@ static struct phy_driver ksphy_driver[] = {
.flags = PHY_HAS_MAGICANEG | PHY_HAS_INTERRUPT,
.driver_data = &ksz8041_type,
.probe = kszphy_probe,
.config_init = kszphy_config_init,
.config_aneg = genphy_config_aneg,
.config_init = ksz8041_config_init,
.config_aneg = ksz8041_config_aneg,
.read_status = genphy_read_status,
.ack_interrupt = kszphy_ack_interrupt,
.config_intr = kszphy_config_intr,

1
include/linux/micrel_phy.h
View File

@ -37,6 +37,7 @@
/* struct phy_device dev_flags definitions */
#define MICREL_PHY_50MHZ_CLK 0x00000001
#define MICREL_PHY_FXEN 0x00000002
#define MICREL_KSZ9021_EXTREG_CTRL 0xB
#define MICREL_KSZ9021_EXTREG_DATA_WRITE 0xC