drivers: ethernet: eth_nxp_imx_netc: support handling pseudo MAC

This is to support handling pseudo MAC during initialization, but not
to support DSA master port. Current driver supports DSA with limitation
that only switch function is available without management via DSA master
port. DSA master port support is TODO work.

Signed-off-by: Yangbo Lu <yangbo.lu@nxp.com>

drivers/ethernet/nxp_imx_netc/Kconfig

@@ -7,6 +7,7 @@ menuconfig ETH_NXP_IMX_NETC
 	depends on DT_HAS_NXP_IMX_NETC_PSI_ENABLED
 	select MDIO
 	select NOCACHE_MEMORY if ARCH_HAS_NOCACHE_MEMORY_SUPPORT
+	select ETH_DSA_SUPPORT
 	help
 	  Enable Ethernet and Network Controller (NETC) driver for NXP IMX SoCs.
 

drivers/ethernet/nxp_imx_netc/eth_nxp_imx_netc.c

@@ -225,6 +225,7 @@ int netc_eth_init_common(const struct device *dev)
 
 int netc_eth_tx(const struct device *dev, struct net_pkt *pkt)
 {
+	const struct netc_eth_config *cfg = dev->config;
 	struct netc_eth_data *data = dev->data;
 	netc_buffer_struct_t buff = {.buffer = data->tx_buff, .length = sizeof(data->tx_buff)};
 	netc_frame_struct_t frame = {.buffArray = &buff, .length = 1};
@@ -234,6 +235,11 @@ int netc_eth_tx(const struct device *dev, struct net_pkt *pkt)
 
 	__ASSERT(pkt, "Packet pointer is NULL");
 
+	/* TODO: support DSA master */
+	if (cfg->pseudo_mac) {
+		return -ENOSYS;
+	}
+
 	k_mutex_lock(&data->tx_mutex, K_FOREVER);
 
 	/* Copy packet to tx buffer */
@@ -275,9 +281,10 @@ error:
 
 enum ethernet_hw_caps netc_eth_get_capabilities(const struct device *dev)
 {
-	ARG_UNUSED(dev);
+	const struct netc_eth_config *cfg = dev->config;
+	uint32_t caps;
 
-	return (ETHERNET_LINK_10BASE_T | ETHERNET_LINK_100BASE_T | ETHERNET_LINK_1000BASE_T |
+	caps = (ETHERNET_LINK_10BASE_T | ETHERNET_LINK_100BASE_T | ETHERNET_LINK_1000BASE_T |
 		ETHERNET_HW_RX_CHKSUM_OFFLOAD | ETHERNET_HW_FILTERING
 #if defined(CONFIG_NET_VLAN)
 		| ETHERNET_HW_VLAN
@@ -286,6 +293,12 @@ enum ethernet_hw_caps netc_eth_get_capabilities(const struct device *dev)
 		| ETHERNET_PROMISC_MODE
 #endif
 	);
+
+	if (cfg->pseudo_mac) {
+		caps |= ETHERNET_DSA_MASTER_PORT;
+	}
+
+	return caps;
 }
 
 int netc_eth_set_config(const struct device *dev, enum ethernet_config_type type,

drivers/ethernet/nxp_imx_netc/eth_nxp_imx_netc_priv.h

@@ -77,6 +77,7 @@ struct netc_eth_config {
 	uint16_t si_idx;
 	const struct device *phy_dev;
 	netc_hw_mii_mode_t phy_mode;
+	volatile bool pseudo_mac;
 	void (*generate_mac)(uint8_t *mac_addr);
 	void (*bdr_init)(netc_bdr_config_t *bdr_config, netc_rx_bdr_config_t *rx_bdr_config,
 			 netc_tx_bdr_config_t *tx_bdr_config);

drivers/ethernet/nxp_imx_netc/eth_nxp_imx_netc_psi.c

@@ -80,6 +80,10 @@ static void netc_eth_iface_init(struct net_if *iface)
 
 	ethernet_init(iface);
 
+	if (cfg->pseudo_mac) {
+		return;
+	}
+
 	/*
 	 * PSI controls the PHY. If PHY is configured either as fixed
 	 * link or autoneg, the callback is executed at least once
@@ -100,11 +104,16 @@ static int netc_eth_init(const struct device *dev)
 	const struct netc_eth_config *cfg = dev->config;
 	int err;
 
+	if (cfg->pseudo_mac) {
+		goto init_common;
+	}
+
 	err = pinctrl_apply_state(cfg->pincfg, PINCTRL_STATE_DEFAULT);
 	if (err) {
 		return err;
 	}
 
+init_common:
 	return netc_eth_init_common(dev);
 }
 
@@ -182,8 +191,10 @@ static const struct ethernet_api netc_eth_api = {.iface_api.init = netc_eth_ifac
 	static const struct netc_eth_config netc_eth##n##_config = {                               \
 		.generate_mac = netc_eth##n##_generate_mac,                                        \
 		.bdr_init = netc_eth##n##_bdr_init,                                                \
-		.phy_dev = DEVICE_DT_GET(DT_INST_PHANDLE(n, phy_handle)),                          \
+		.phy_dev = (COND_CODE_1(DT_INST_NODE_HAS_PROP(n, phy_handle),                      \
+					(DEVICE_DT_GET(DT_INST_PHANDLE(n, phy_handle))), NULL)),   \
 		.phy_mode = NETC_PHY_MODE(DT_DRV_INST(n)),                                         \
+		.pseudo_mac = DT_ENUM_HAS_VALUE(DT_DRV_INST(n), phy_connection_type, internal),    \
 		.pincfg = PINCTRL_DT_INST_DEV_CONFIG_GET(n),                                       \
 		.si_idx = (DT_INST_PROP(n, mac_index) << 8) | DT_INST_PROP(n, si_index),           \
 		.tx_intr_msg_data = NETC_TX_INTR_MSG_DATA_START + n,                               \