net: phy: DP83822: Add setting the fixed internal delay

The DP83822 can be configured to use the RGMII interface. There are
independent fixed 3.5ns clock shift (aka internal delay) for the TX and RX
paths. This allow either one to be set if the MII interface is RGMII and
the value is set in the firmware node.
Signed-off-by: Dan Murphy <dmurphy@ti.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/phy/dp83822.c

@@ -26,7 +26,9 @@
 #define MII_DP83822_PHYSCR	0x11
 #define MII_DP83822_MISR1	0x12
 #define MII_DP83822_MISR2	0x13
+#define MII_DP83822_RCSR	0x17
 #define MII_DP83822_RESET_CTRL	0x1f
+#define MII_DP83822_GENCFG	0x465
 
 #define DP83822_HW_RESET	BIT(15)
 #define DP83822_SW_RESET	BIT(14)
@@ -77,6 +79,10 @@
 #define DP83822_WOL_INDICATION_SEL BIT(8)
 #define DP83822_WOL_CLR_INDICATION BIT(11)
 
+/* RSCR bits */
+#define DP83822_RX_CLK_SHIFT	BIT(12)
+#define DP83822_TX_CLK_SHIFT	BIT(11)
+
 static int dp83822_ack_interrupt(struct phy_device *phydev)
 {
 	int err;
@@ -255,7 +261,7 @@ static int dp83822_config_intr(struct phy_device *phydev)
 	return phy_write(phydev, MII_DP83822_PHYSCR, physcr_status);
 }
 
-static int dp83822_config_init(struct phy_device *phydev)
+static int dp8382x_disable_wol(struct phy_device *phydev)
 {
 	int value = DP83822_WOL_EN | DP83822_WOL_MAGIC_EN |
 		    DP83822_WOL_SECURE_ON;
@@ -264,6 +270,46 @@ static int dp83822_config_init(struct phy_device *phydev)
 				  MII_DP83822_WOL_CFG, value);
 }
 
+static int dp83822_config_init(struct phy_device *phydev)
+{
+	struct device *dev = &phydev->mdio.dev;
+	int rgmii_delay;
+	s32 rx_int_delay;
+	s32 tx_int_delay;
+	int err = 0;
+
+	if (phy_interface_is_rgmii(phydev)) {
+		rx_int_delay = phy_get_internal_delay(phydev, dev, NULL, 0,
+						      true);
+
+		if (rx_int_delay <= 0)
+			rgmii_delay = 0;
+		else
+			rgmii_delay = DP83822_RX_CLK_SHIFT;
+
+		tx_int_delay = phy_get_internal_delay(phydev, dev, NULL, 0,
+						      false);
+		if (tx_int_delay <= 0)
+			rgmii_delay &= ~DP83822_TX_CLK_SHIFT;
+		else
+			rgmii_delay |= DP83822_TX_CLK_SHIFT;
+
+		if (rgmii_delay) {
+			err = phy_set_bits_mmd(phydev, DP83822_DEVADDR,
+					       MII_DP83822_RCSR, rgmii_delay);
+			if (err)
+				return err;
+		}
+	}
+
+	return dp8382x_disable_wol(phydev);
+}
+
+static int dp8382x_config_init(struct phy_device *phydev)
+{
+	return dp8382x_disable_wol(phydev);
+}
+
 static int dp83822_phy_reset(struct phy_device *phydev)
 {
 	int err;
@@ -272,9 +318,7 @@ static int dp83822_phy_reset(struct phy_device *phydev)
 	if (err < 0)
 		return err;
 
-	dp83822_config_init(phydev);
-
-	return 0;
+	return phydev->drv->config_init(phydev);
 }
 
 static int dp83822_suspend(struct phy_device *phydev)
@@ -318,14 +362,29 @@ static int dp83822_resume(struct phy_device *phydev)
 		.resume = dp83822_resume,			\
 	}
 
+#define DP8382X_PHY_DRIVER(_id, _name)				\
+	{							\
+		PHY_ID_MATCH_MODEL(_id),			\
+		.name		= (_name),			\
+		/* PHY_BASIC_FEATURES */			\
+		.soft_reset	= dp83822_phy_reset,		\
+		.config_init	= dp8382x_config_init,		\
+		.get_wol = dp83822_get_wol,			\
+		.set_wol = dp83822_set_wol,			\
+		.ack_interrupt = dp83822_ack_interrupt,		\
+		.config_intr = dp83822_config_intr,		\
+		.suspend = dp83822_suspend,			\
+		.resume = dp83822_resume,			\
+	}
+
 static struct phy_driver dp83822_driver[] = {
 	DP83822_PHY_DRIVER(DP83822_PHY_ID, "TI DP83822"),
-	DP83822_PHY_DRIVER(DP83825I_PHY_ID, "TI DP83825I"),
-	DP83822_PHY_DRIVER(DP83826C_PHY_ID, "TI DP83826C"),
-	DP83822_PHY_DRIVER(DP83826NC_PHY_ID, "TI DP83826NC"),
-	DP83822_PHY_DRIVER(DP83825S_PHY_ID, "TI DP83825S"),
-	DP83822_PHY_DRIVER(DP83825CM_PHY_ID, "TI DP83825M"),
-	DP83822_PHY_DRIVER(DP83825CS_PHY_ID, "TI DP83825CS"),
+	DP8382X_PHY_DRIVER(DP83825I_PHY_ID, "TI DP83825I"),
+	DP8382X_PHY_DRIVER(DP83826C_PHY_ID, "TI DP83826C"),
+	DP8382X_PHY_DRIVER(DP83826NC_PHY_ID, "TI DP83826NC"),
+	DP8382X_PHY_DRIVER(DP83825S_PHY_ID, "TI DP83825S"),
+	DP8382X_PHY_DRIVER(DP83825CM_PHY_ID, "TI DP83825M"),
+	DP8382X_PHY_DRIVER(DP83825CS_PHY_ID, "TI DP83825CS"),
 };
 module_phy_driver(dp83822_driver);