phy: add driver for Intel XWAY PHY

Add a driver for the Intel XWAY GbE PHY:
 - configure RGMII using dt phy-mode and standard delay properties
 - use genphy_config

Signed-off-by: Tim Harvey <tharvey@gateworks.com>

drivers/net/phy/Kconfig

@@ -321,6 +321,11 @@ config PHY_XILINX_GMII2RGMII
 	  as bridge between MAC connected over GMII and external phy that
 	  is connected over RGMII interface.
 
+config PHY_XWAY
+	bool "Intel XWAY PHY support"
+	help
+	  This adds support for the Intel XWAY (formerly Lantiq) Gbe PHYs.
+
 config PHY_ETHERNET_ID
 	bool "Read ethernet PHY id"
 	depends on DM_GPIO

drivers/net/phy/Makefile

@@ -34,6 +34,7 @@ obj-$(CONFIG_PHY_TI_DP83867) += dp83867.o
 obj-$(CONFIG_PHY_TI_DP83869) += dp83869.o
 obj-$(CONFIG_PHY_XILINX) += xilinx_phy.o
 obj-$(CONFIG_PHY_XILINX_GMII2RGMII) += xilinx_gmii2rgmii.o
+obj-$(CONFIG_PHY_XWAY) += intel_xway.o
 obj-$(CONFIG_PHY_ETHERNET_ID) += ethernet_id.o
 obj-$(CONFIG_PHY_VITESSE) += vitesse.o
 obj-$(CONFIG_PHY_MSCC) += mscc.o

drivers/net/phy/intel_xway.c

@@ -0,0 +1,48 @@
+// SPDX-License-Identifier: GPL-2.0+
+#include <common.h>
+#include <phy.h>
+#include <linux/bitfield.h>
+
+#define XWAY_MDIO_MIICTRL		0x17	/* mii control */
+
+#define XWAY_MDIO_MIICTRL_RXSKEW_MASK	GENMASK(14, 12)
+#define XWAY_MDIO_MIICTRL_TXSKEW_MASK	GENMASK(10, 8)
+
+static int xway_config(struct phy_device *phydev)
+{
+	ofnode node = phy_get_ofnode(phydev);
+	u32 val = 0;
+
+	if (ofnode_valid(node)) {
+		u32 rx_delay, tx_delay;
+
+		rx_delay = ofnode_read_u32_default(node, "rx-internal-delay-ps", 2000);
+		tx_delay = ofnode_read_u32_default(node, "tx-internal-delay-ps", 2000);
+		val |= FIELD_PREP(XWAY_MDIO_MIICTRL_TXSKEW_MASK, rx_delay / 500);
+		val |= FIELD_PREP(XWAY_MDIO_MIICTRL_RXSKEW_MASK, tx_delay / 500);
+		phy_modify(phydev, MDIO_DEVAD_NONE, XWAY_MDIO_MIICTRL,
+			   XWAY_MDIO_MIICTRL_TXSKEW_MASK |
+			   XWAY_MDIO_MIICTRL_RXSKEW_MASK, val);
+	}
+
+	genphy_config_aneg(phydev);
+
+	return 0;
+}
+
+static struct phy_driver XWAY_driver = {
+	.name = "XWAY",
+	.uid = 0xD565A400,
+	.mask = 0xffffff00,
+	.features = PHY_GBIT_FEATURES,
+	.config = xway_config,
+	.startup = genphy_startup,
+	.shutdown = genphy_shutdown,
+};
+
+int phy_xway_init(void)
+{
+	phy_register(&XWAY_driver);
+
+	return 0;
+}

drivers/net/phy/phy.c

@@ -556,6 +556,9 @@ int phy_init(void)
 #ifdef CONFIG_PHY_XILINX
 	phy_xilinx_init();
 #endif
+#ifdef CONFIG_PHY_XWAY
+	phy_xway_init();
+#endif
 #ifdef CONFIG_PHY_MSCC
 	phy_mscc_init();
 #endif

include/phy.h

@@ -380,6 +380,7 @@ int phy_teranetics_init(void);
 int phy_ti_init(void);
 int phy_vitesse_init(void);
 int phy_xilinx_init(void);
+int phy_xway_init(void);
 int phy_mscc_init(void);
 int phy_fixed_init(void);
 int phy_ncsi_init(void);