drivers: mdio: lan865x: add mdio driver support

Implement lan865x mdio driver to provide interface between lan865x MAC
driver and internal PHY driver phy_microchip_t1s.c. This driver is needed
to support the driver architecture followed.

Signed-off-by: Parthiban Veerasooran <parthiban.veerasooran@microchip.com>

drivers/ethernet/eth_lan865x.c

@@ -18,9 +18,42 @@ LOG_MODULE_REGISTER(eth_lan865x, CONFIG_ETHERNET_LOG_LEVEL);
 #include <zephyr/net/net_if.h>
 #include <zephyr/net/ethernet.h>
 #include <zephyr/net/phy.h>
+#include <zephyr/drivers/ethernet/eth_lan865x.h>
 
 #include "eth_lan865x_priv.h"
 
+int eth_lan865x_mdio_c22_read(const struct device *dev, uint8_t prtad, uint8_t regad,
+			      uint16_t *data)
+{
+	struct lan865x_data *ctx = dev->data;
+
+	return oa_tc6_mdio_read(ctx->tc6, prtad, regad, data);
+}
+
+int eth_lan865x_mdio_c22_write(const struct device *dev, uint8_t prtad, uint8_t regad,
+			       uint16_t data)
+{
+	struct lan865x_data *ctx = dev->data;
+
+	return oa_tc6_mdio_write(ctx->tc6, prtad, regad, data);
+}
+
+int eth_lan865x_mdio_c45_read(const struct device *dev, uint8_t prtad, uint8_t devad,
+			      uint16_t regad, uint16_t *data)
+{
+	struct lan865x_data *ctx = dev->data;
+
+	return oa_tc6_mdio_read_c45(ctx->tc6, prtad, devad, regad, data);
+}
+
+int eth_lan865x_mdio_c45_write(const struct device *dev, uint8_t prtad, uint8_t devad,
+			       uint16_t regad, uint16_t data)
+{
+	struct lan865x_data *ctx = dev->data;
+
+	return oa_tc6_mdio_write_c45(ctx->tc6, prtad, devad, regad, data);
+}
+
 static int lan865x_mac_rxtx_control(const struct device *dev, bool en)
 {
 	struct lan865x_data *ctx = dev->data;

drivers/mdio/CMakeLists.txt

@@ -17,3 +17,4 @@ zephyr_library_sources_ifdef(CONFIG_MDIO_INFINEON_XMC4XXX mdio_xmc4xxx.c)
 zephyr_library_sources_ifdef(CONFIG_MDIO_NXP_ENET_QOS	mdio_nxp_enet_qos.c)
 zephyr_library_sources_ifdef(CONFIG_MDIO_DWCXGMAC	mdio_dwcxgmac.c)
 zephyr_library_sources_ifdef(CONFIG_MDIO_RENESAS_RA	mdio_renesas_ra.c)
+zephyr_library_sources_ifdef(CONFIG_MDIO_LAN865X	mdio_lan865x.c)

drivers/mdio/Kconfig

@@ -38,6 +38,7 @@ source "drivers/mdio/Kconfig.xmc4xxx"
 source "drivers/mdio/Kconfig.nxp_enet_qos"
 source "drivers/mdio/Kconfig.dwcxgmac"
 source "drivers/mdio/Kconfig.renesas_ra"
+source "drivers/mdio/Kconfig.lan865x"
 
 config MDIO_INIT_PRIORITY
 	int "Init priority"

drivers/mdio/Kconfig.lan865x

@@ -0,0 +1,20 @@
+# Copyright 2024 Microchip Technology Inc
+# SPDX-License-Identifier: Apache-2.0
+
+menuconfig MDIO_LAN865X
+	bool "LAN865X MDIO driver"
+	default y
+	depends on DT_HAS_MICROCHIP_LAN865X_MDIO_ENABLED
+	depends on ETH_LAN865X
+	help
+	  Enable LAN865X MDIO driver.
+
+if MDIO_LAN865X
+
+config MDIO_LAN865X_INIT_PRIORITY
+	int "LAN865X MDIO init priority"
+	default 81
+	help
+	  LAN865X MDIO device driver initialization priority.
+
+endif

drivers/mdio/mdio_lan865x.c

@@ -0,0 +1,79 @@
+/*
+ * Copyright (c) 2024 Microchip Technology Inc.
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+#include <zephyr/logging/log.h>
+LOG_MODULE_REGISTER(mdio_lan865x, CONFIG_MDIO_LOG_LEVEL);
+
+#define DT_DRV_COMPAT microchip_lan865x_mdio
+
+#include <stdint.h>
+#include <errno.h>
+#include <zephyr/device.h>
+#include <zephyr/kernel.h>
+#include <zephyr/drivers/mdio.h>
+#include <zephyr/drivers/ethernet/eth_lan865x.h>
+
+struct mdio_lan865x_config {
+	const struct device *dev;
+};
+
+static void lan865x_mdio_bus_enable(const struct device *dev)
+{
+	ARG_UNUSED(dev);
+}
+
+static void lan865x_mdio_bus_disable(const struct device *dev)
+{
+	ARG_UNUSED(dev);
+}
+
+static int lan865x_mdio_c22_read(const struct device *dev, uint8_t prtad, uint8_t regad,
+				 uint16_t *data)
+{
+	const struct mdio_lan865x_config *const cfg = dev->config;
+
+	return eth_lan865x_mdio_c22_read(cfg->dev, prtad, regad, data);
+}
+
+static int lan865x_mdio_c22_write(const struct device *dev, uint8_t prtad, uint8_t regad,
+				  uint16_t data)
+{
+	const struct mdio_lan865x_config *const cfg = dev->config;
+
+	return eth_lan865x_mdio_c22_write(cfg->dev, prtad, regad, data);
+}
+
+static int lan865x_mdio_c45_read(const struct device *dev, uint8_t prtad, uint8_t devad,
+				 uint16_t regad, uint16_t *data)
+{
+	const struct mdio_lan865x_config *const cfg = dev->config;
+
+	return eth_lan865x_mdio_c45_read(cfg->dev, prtad, devad, regad, data);
+}
+
+static int lan865x_mdio_c45_write(const struct device *dev, uint8_t prtad, uint8_t devad,
+				  uint16_t regad, uint16_t data)
+{
+	const struct mdio_lan865x_config *const cfg = dev->config;
+
+	return eth_lan865x_mdio_c45_write(cfg->dev, prtad, devad, regad, data);
+}
+
+static const struct mdio_driver_api mdio_lan865x_api = {.read = lan865x_mdio_c22_read,
+							.write = lan865x_mdio_c22_write,
+							.read_c45 = lan865x_mdio_c45_read,
+							.write_c45 = lan865x_mdio_c45_write,
+							.bus_enable = lan865x_mdio_bus_enable,
+							.bus_disable = lan865x_mdio_bus_disable};
+
+#define MICROCHIP_LAN865X_MDIO_INIT(n)                                                             \
+	static const struct mdio_lan865x_config mdio_lan865x_config_##n = {                        \
+		.dev = DEVICE_DT_GET(DT_INST_PARENT(n)),                                           \
+	};                                                                                         \
+	DEVICE_DT_INST_DEFINE(n, NULL, NULL, NULL, &mdio_lan865x_config_##n, POST_KERNEL,          \
+			      CONFIG_MDIO_LAN865X_INIT_PRIORITY, &mdio_lan865x_api);
+
+DT_INST_FOREACH_STATUS_OKAY(MICROCHIP_LAN865X_MDIO_INIT)

dts/bindings/mdio/microchip,lan865x-mdio.yaml

@@ -0,0 +1,10 @@
+# Copyright (c) 2024 Microchip Technology Inc.
+# SPDX-License-Identifier: Apache-2.0
+
+description: LAN865X MDIO Driver node
+
+compatible: "microchip,lan865x-mdio"
+
+include: mdio-controller.yaml
+
+on-bus: lan865x

include/zephyr/drivers/ethernet/eth_lan865x.h

@@ -0,0 +1,92 @@
+/*
+ * Copyright (c) 2024 Microchip Technology Inc.
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+#ifndef ZEPHYR_INCLUDE_DRIVERS_ETH_LAN865X_H__
+#define ZEPHYR_INCLUDE_DRIVERS_ETH_LAN865X_H__
+
+#include <stdint.h>
+#include <zephyr/kernel.h>
+#include <zephyr/device.h>
+
+/**
+ * @brief      Read C22 registers using LAN865X MDIO Bus
+ *
+ * This routine provides an interface to perform a C22 register read on the
+ * LAN865X MDIO bus.
+ *
+ * @param[in]  dev         Pointer to the device structure for the controller
+ * @param[in]  prtad       Port address
+ * @param[in]  regad       Register address
+ * @param      data        Pointer to receive read data
+ *
+ * @retval 0 If successful.
+ * @retval -EIO General input / output error.
+ * @retval -ETIMEDOUT If transaction timedout on the bus
+ * @retval -ENOSYS if read is not supported
+ */
+int eth_lan865x_mdio_c22_read(const struct device *dev, uint8_t prtad, uint8_t regad,
+			      uint16_t *data);
+
+/**
+ * @brief      Write C22 registers using LAN865X MDIO Bus
+ *
+ * This routine provides an interface to perform a C22 register write on the
+ * LAN865X MDIO bus.
+ *
+ * @param[in]  dev         Pointer to the device structure for the controller
+ * @param[in]  prtad       Port address
+ * @param[in]  regad       Register address
+ * @param[in]  data        Write data
+ *
+ * @retval 0 If successful.
+ * @retval -EIO General input / output error.
+ * @retval -ETIMEDOUT If transaction timedout on the bus
+ * @retval -ENOSYS if read is not supported
+ */
+int eth_lan865x_mdio_c22_write(const struct device *dev, uint8_t prtad, uint8_t regad,
+			       uint16_t data);
+
+/**
+ * @brief      Read C45 registers using LAN865X MDIO Bus
+ *
+ * This routine provides an interface to perform a C45 register read on the
+ * LAN865X MDIO bus.
+ *
+ * @param[in]  dev         Pointer to the device structure for the controller
+ * @param[in]  prtad       Port address
+ * @param[in]  devad       MMD device address
+ * @param[in]  regad       Register address
+ * @param      data        Pointer to receive read data
+ *
+ * @retval 0 If successful.
+ * @retval -EIO General input / output error.
+ * @retval -ETIMEDOUT If transaction timedout on the bus
+ * @retval -ENOSYS if read is not supported
+ */
+int eth_lan865x_mdio_c45_read(const struct device *dev, uint8_t prtad, uint8_t devad,
+			      uint16_t regad, uint16_t *data);
+
+/**
+ * @brief      Write C45 registers using LAN865X MDIO Bus
+ *
+ * This routine provides an interface to perform a C45 register write on the
+ * LAN865X MDIO bus.
+ *
+ * @param[in]  dev         Pointer to the device structure for the controller
+ * @param[in]  prtad       Port address
+ * @param[in]  devad       MMD device address
+ * @param[in]  regad       Register address
+ * @param[in]  data        Write data
+ *
+ * @retval 0 If successful.
+ * @retval -EIO General input / output error.
+ * @retval -ETIMEDOUT If transaction timedout on the bus
+ * @retval -ENOSYS if read is not supported
+ */
+int eth_lan865x_mdio_c45_write(const struct device *dev, uint8_t prtad, uint8_t devad,
+			       uint16_t regad, uint16_t data);
+
+#endif /* ZEPHYR_INCLUDE_DRIVERS_ETH_LAN865X_H__ */