net: phy: dp83867: add support for MAC impedance configuration

Add support for programmable MAC impedance configuration

Signed-off-by: Mugunthan V N <mugunthanvnm@ti.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Mugunthan V N 2016-10-18 16:50:18 +05:30 committed by David S. Miller
parent d6081de7e0
commit ed838fe937

View File

@ -33,6 +33,7 @@
/* Extended Registers */ /* Extended Registers */
#define DP83867_RGMIICTL 0x0032 #define DP83867_RGMIICTL 0x0032
#define DP83867_RGMIIDCTL 0x0086 #define DP83867_RGMIIDCTL 0x0086
#define DP83867_IO_MUX_CFG 0x0170
#define DP83867_SW_RESET BIT(15) #define DP83867_SW_RESET BIT(15)
#define DP83867_SW_RESTART BIT(14) #define DP83867_SW_RESTART BIT(14)
@ -62,10 +63,17 @@
/* RGMIIDCTL bits */ /* RGMIIDCTL bits */
#define DP83867_RGMII_TX_CLK_DELAY_SHIFT 4 #define DP83867_RGMII_TX_CLK_DELAY_SHIFT 4
/* IO_MUX_CFG bits */
#define DP83867_IO_MUX_CFG_IO_IMPEDANCE_CTRL 0x1f
#define DP83867_IO_MUX_CFG_IO_IMPEDANCE_MAX 0x0
#define DP83867_IO_MUX_CFG_IO_IMPEDANCE_MIN 0x1f
struct dp83867_private { struct dp83867_private {
int rx_id_delay; int rx_id_delay;
int tx_id_delay; int tx_id_delay;
int fifo_depth; int fifo_depth;
int io_impedance;
}; };
static int dp83867_ack_interrupt(struct phy_device *phydev) static int dp83867_ack_interrupt(struct phy_device *phydev)
@ -111,6 +119,14 @@ static int dp83867_of_init(struct phy_device *phydev)
if (!of_node) if (!of_node)
return -ENODEV; return -ENODEV;
dp83867->io_impedance = -EINVAL;
/* Optional configuration */
if (of_property_read_bool(of_node, "ti,max-output-impedance"))
dp83867->io_impedance = DP83867_IO_MUX_CFG_IO_IMPEDANCE_MAX;
else if (of_property_read_bool(of_node, "ti,min-output-impedance"))
dp83867->io_impedance = DP83867_IO_MUX_CFG_IO_IMPEDANCE_MIN;
ret = of_property_read_u32(of_node, "ti,rx-internal-delay", ret = of_property_read_u32(of_node, "ti,rx-internal-delay",
&dp83867->rx_id_delay); &dp83867->rx_id_delay);
if (ret) if (ret)
@ -184,6 +200,18 @@ static int dp83867_config_init(struct phy_device *phydev)
phy_write_mmd_indirect(phydev, DP83867_RGMIIDCTL, phy_write_mmd_indirect(phydev, DP83867_RGMIIDCTL,
DP83867_DEVADDR, delay); DP83867_DEVADDR, delay);
if (dp83867->io_impedance >= 0) {
val = phy_read_mmd_indirect(phydev, DP83867_IO_MUX_CFG,
DP83867_DEVADDR);
val &= ~DP83867_IO_MUX_CFG_IO_IMPEDANCE_CTRL;
val |= dp83867->io_impedance &
DP83867_IO_MUX_CFG_IO_IMPEDANCE_CTRL;
phy_write_mmd_indirect(phydev, DP83867_IO_MUX_CFG,
DP83867_DEVADDR, val);
}
} }
return 0; return 0;