From: Gabor Juhos <juhosg@openwrt.org>
Subject: net: phy: allow to configure AR803x PHYs via platform data

Add a patch for the at803x phy driver, in order to be able
to configure some register settings via platform data.

Signed-off-by: Gabor Juhos <juhosg@openwrt.org>
---
 drivers/net/phy/at803x.c                 | 56 ++++++++++++++++++++++++++++++++
 include/linux/platform_data/phy-at803x.h | 11 +++++++
 2 files changed, 67 insertions(+)
 create mode 100644 include/linux/platform_data/phy-at803x.h

--- a/drivers/net/phy/at803x.c
+++ b/drivers/net/phy/at803x.c
@@ -12,12 +12,14 @@
  */
 
 #include <linux/phy.h>
+#include <linux/mdio.h>
 #include <linux/module.h>
 #include <linux/string.h>
 #include <linux/netdevice.h>
 #include <linux/etherdevice.h>
 #include <linux/of_gpio.h>
 #include <linux/gpio/consumer.h>
+#include <linux/platform_data/phy-at803x.h>
 
 #define AT803X_INTR_ENABLE			0x12
 #define AT803X_INTR_ENABLE_AUTONEG_ERR		BIT(15)
@@ -45,6 +47,11 @@
 #define AT803X_REG_CHIP_CONFIG			0x1f
 #define AT803X_BT_BX_REG_SEL			0x8000
 
+#define AT803X_PCS_SMART_EEE_CTRL3			0x805D
+#define AT803X_SMART_EEE_CTRL3_LPI_TX_DELAY_SEL_MASK	0x3
+#define AT803X_SMART_EEE_CTRL3_LPI_TX_DELAY_SEL_SHIFT	12
+#define AT803X_SMART_EEE_CTRL3_LPI_EN			BIT(8)
+
 #define AT803X_DEBUG_ADDR			0x1D
 #define AT803X_DEBUG_DATA			0x1E
 
@@ -72,6 +79,7 @@ MODULE_LICENSE("GPL");
 struct at803x_priv {
 	bool phy_reset:1;
 	struct gpio_desc *gpiod_reset;
+	int prev_speed;
 };
 
 struct at803x_context {
@@ -276,8 +284,16 @@ does_not_require_reset_workaround:
 	return 0;
 }
 
+static void at803x_disable_smarteee(struct phy_device *phydev)
+{
+	phy_write_mmd(phydev, MDIO_MMD_PCS, AT803X_PCS_SMART_EEE_CTRL3,
+		1 << AT803X_SMART_EEE_CTRL3_LPI_TX_DELAY_SEL_SHIFT);
+	phy_write_mmd(phydev, MDIO_MMD_AN, MDIO_AN_EEE_ADV, 0);
+}
+
 static int at803x_config_init(struct phy_device *phydev)
 {
+	struct at803x_platform_data *pdata;
 	int ret;
 
 	ret = genphy_config_init(phydev);
@@ -298,6 +314,26 @@ static int at803x_config_init(struct phy
 			return ret;
 	}
 
+	pdata = dev_get_platdata(&phydev->mdio.dev);
+	if (pdata) {
+		if (pdata->disable_smarteee)
+			at803x_disable_smarteee(phydev);
+
+		if (pdata->enable_rgmii_rx_delay)
+			at803x_debug_reg_mask(phydev, AT803X_DEBUG_REG_0, 0,
+				AT803X_DEBUG_RX_CLK_DLY_EN);
+		else
+			at803x_debug_reg_mask(phydev, AT803X_DEBUG_REG_0,
+				AT803X_DEBUG_RX_CLK_DLY_EN, 0);
+
+		if (pdata->enable_rgmii_tx_delay)
+			at803x_debug_reg_mask(phydev, AT803X_DEBUG_REG_5, 0,
+				AT803X_DEBUG_TX_CLK_DLY_EN);
+		else
+			at803x_debug_reg_mask(phydev, AT803X_DEBUG_REG_5,
+				AT803X_DEBUG_TX_CLK_DLY_EN, 0);
+	}
+
 	return 0;
 }
 
@@ -335,6 +371,8 @@ static int at803x_config_intr(struct phy
 static void at803x_link_change_notify(struct phy_device *phydev)
 {
 	struct at803x_priv *priv = phydev->priv;
+	struct at803x_platform_data *pdata;
+	pdata = dev_get_platdata(&phydev->mdio.dev);
 
 	/*
 	 * Conduct a hardware reset for AT8030/2 every time a link loss is
@@ -363,6 +401,24 @@ static void at803x_link_change_notify(st
 	} else {
 		priv->phy_reset = false;
 	}
+	if (pdata && pdata->fixup_rgmii_tx_delay &&
+	    phydev->speed != priv->prev_speed) {
+		switch (phydev->speed) {
+		case SPEED_10:
+		case SPEED_100:
+			at803x_debug_reg_mask(phydev, AT803X_DEBUG_REG_5, 0,
+				AT803X_DEBUG_TX_CLK_DLY_EN);
+			break;
+		case SPEED_1000:
+			at803x_debug_reg_mask(phydev, AT803X_DEBUG_REG_5,
+				AT803X_DEBUG_TX_CLK_DLY_EN, 0);
+			break;
+		default:
+			break;
+		}
+
+		priv->prev_speed = phydev->speed;
+	}
 }
 
 static int at803x_aneg_done(struct phy_device *phydev)
--- /dev/null
+++ b/include/linux/platform_data/phy-at803x.h
@@ -0,0 +1,11 @@
+#ifndef _PHY_AT803X_PDATA_H
+#define _PHY_AT803X_PDATA_H
+
+struct at803x_platform_data {
+	int disable_smarteee:1;
+	int enable_rgmii_tx_delay:1;
+	int enable_rgmii_rx_delay:1;
+	int fixup_rgmii_tx_delay:1;
+};
+
+#endif /* _PHY_AT803X_PDATA_H */
