We can't detect the FXEN (fiber mode) bootstrap pin, so configure it via a boolean device tree property "fxen". 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.za...@pengutronix.de> --- I didn't see a way to reliably detect whether the PHY is set to fiber mode in the datasheet [1], so this patch adds a device tree property to enforce fiber mode (disable auto-negotiation, set speed to 100). [1] http://ww1.microchip.com/downloads/en/DeviceDoc/ksz8041tl-ftl-mll.pdf --- .../devicetree/bindings/net/micrel-ksz8041.txt | 24 ++++++++++++++++ drivers/net/phy/micrel.c | 32 ++++++++++++++++++++-- include/linux/micrel_phy.h | 1 + 3 files changed, 55 insertions(+), 2 deletions(-) create mode 100644 Documentation/devicetree/bindings/net/micrel-ksz8041.txt diff --git a/Documentation/devicetree/bindings/net/micrel-ksz8041.txt b/Documentation/devicetree/bindings/net/micrel-ksz8041.txt new file mode 100644 index 0000000..4bce38d2 --- /dev/null +++ b/Documentation/devicetree/bindings/net/micrel-ksz8041.txt @@ -0,0 +1,24 @@ +Micrel KSZ8041 Gigabit Ethernet PHY + +The KSZ8041FTL variant supports 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 a boolean device tree property can be +used to describe this. + +Optional properties: + - fxen : KSZ8041FTL is strapped to fiber mode. Auto-negotiation is disabled + and the PHY can only work in 100base-fx (full and half duplex) modes. + +Examples: + + mdio { + phy0: ethernet-phy@0 { + reg = <0>; + fxen; + }; + }; + ethernet@70000 { + status = "okay"; + phy = <&phy0>; + phy-mode = "rgmii-id"; + }; diff --git a/drivers/net/phy/micrel.c b/drivers/net/phy/micrel.c index 5a8fefc..4ecd929 100644 --- a/drivers/net/phy/micrel.c +++ b/drivers/net/phy/micrel.c @@ -311,6 +311,34 @@ static int kszphy_config_init(struct phy_device *phydev) return 0; } +static int ksz8041_config_init(struct phy_device *phydev) +{ + /* Limit supported and advertised modes in fiber mode */ + if (of_property_read_bool(phydev->mdio.dev.of_node, "fxen")) { + 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 +816,8 @@ 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, diff --git a/include/linux/micrel_phy.h b/include/linux/micrel_phy.h index 2e5b194..257173e 100644 --- a/include/linux/micrel_phy.h +++ b/include/linux/micrel_phy.h @@ -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 -- 2.8.1
