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Commit ed838fe9 authored by Mugunthan V N's avatar Mugunthan V N Committed by David S. Miller
Browse files

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



Add support for programmable MAC impedance configuration

Signed-off-by: default avatarMugunthan V N <mugunthanvnm@ti.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent d6081de7

drivers/net/phy/dp83867.c

+28 −0
Original line number Diff line number Diff line
@@ -33,6 +33,7 @@ 
/* Extended Registers */

#define DP83867_RGMIICTL	0x0032

#define DP83867_RGMIIDCTL	0x0086

#define DP83867_IO_MUX_CFG	0x0170



#define DP83867_SW_RESET	BIT(15)

#define DP83867_SW_RESTART	BIT(14)
@@ -62,10 +63,17 @@ 
/* RGMIIDCTL bits */

#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 {

	int rx_id_delay;

	int tx_id_delay;

	int fifo_depth;

	int io_impedance;

};



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)

		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",

				   &dp83867->rx_id_delay);

	if (ret)
@@ -184,6 +200,18 @@ static int dp83867_config_init(struct phy_device *phydev) 


		phy_write_mmd_indirect(phydev, DP83867_RGMIIDCTL,

				       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;