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net: phy: dp83867: add workaround for incorrect RX_CTRL pin strap 

The data manual for DP83867IR/CR, SNLS484E[1], revised march 2017,
advises that strapping RX_DV/RX_CTRL pin in mode 1 and 2 is not
supported (see note below Table 5 (4-Level Strap Pins)).

There are some boards which have the pin strapped this way and need
software workaround suggested by the data manual. Bit[7] of
Configuration Register 4 (address 0x0031) must be cleared to 0. This
ensures proper operation of the PHY.

Implement driver support for device-tree property meant to advertise
the wrong strapping.

[1] http://www.ti.com/lit/ds/snls484e/snls484e.pdf

Signed-off-by: Murali Karicheri <m-karicheri2@ti.com>
[nsekhar@ti.com: rebase to mainline, code simplification]
Signed-off-by: Sekhar Nori <nsekhar@ti.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Murali Karicheri 2017-07-04 16:23:24 +05:30 committed by David S. Miller
parent 908a773325
commit 371444764b
1 changed files with 11 additions and 0 deletions
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11
drivers/net/phy/dp83867.c
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@ -91,6 +91,7 @@ struct dp83867_private {
int fifo_depth;
int io_impedance;
int port_mirroring;
bool rxctrl_strap_quirk;
};
static int dp83867_ack_interrupt(struct phy_device *phydev)
@ -164,6 +165,9 @@ static int dp83867_of_init(struct phy_device *phydev)
else if (of_property_read_bool(of_node, "ti,min-output-impedance"))
dp83867->io_impedance = DP83867_IO_MUX_CFG_IO_IMPEDANCE_MIN;
dp83867->rxctrl_strap_quirk = of_property_read_bool(of_node,
"ti,dp83867-rxctrl-strap-quirk");
ret = of_property_read_u32(of_node, "ti,rx-internal-delay",
&dp83867->rx_id_delay);
if (ret &&
@ -214,6 +218,13 @@ static int dp83867_config_init(struct phy_device *phydev)
dp83867 = (struct dp83867_private *)phydev->priv;
}
/* RX_DV/RX_CTRL strapped in mode 1 or mode 2 workaround */
if (dp83867->rxctrl_strap_quirk) {
val = phy_read_mmd(phydev, DP83867_DEVADDR, DP83867_CFG4);
val &= ~BIT(7);
phy_write_mmd(phydev, DP83867_DEVADDR, DP83867_CFG4, val);
}
if (phy_interface_is_rgmii(phydev)) {
val = phy_read(phydev, MII_DP83867_PHYCTRL);
if (val < 0)