drivers: nxp_s32_netc: support both netc port selections

The s32 netc psi configuration is hardcoded to port 0 of the interface,
with no path to associate with port 1. Add a DT property for
selecting the port, with 0 remaining the default for compatibility.

Signed-off-by: Matthew Christian <[email protected]>

Author: mcc-terraline

drivers/ethernet/eth_nxp_s32_netc_priv.h

@@ -13,8 +13,7 @@
 #define NETC_MIN_RING_LEN	8U
 #define NETC_MIN_RING_BUF_SIZE	64U
 
-#define NETC_SWITCH_IDX		0U
-#define NETC_SWITCH_PORT_IDX	0U
+#define NETC_SWITCH_IDX         0U
 #define NETC_SWITCH_PORT_AGING	300U
 #define NETC_ETH_0_RX_CLK_IDX	49U
 #define NETC_ETH_1_RX_CLK_IDX	51U

drivers/ethernet/eth_nxp_s32_netc_psi.c

@@ -409,7 +409,7 @@ static const struct nxp_s32_eth_config nxp_s32_eth##n##_config = {			\
 		.paCtrlTxRingConfig = &nxp_s32_eth##n##_txring_cfg,			\
 	},										\
 	.si_idx = NETC_SI_NXP_S32_HW_INSTANCE(n),					\
-	.port_idx = NETC_SWITCH_PORT_IDX,						\
+	.port_idx = DT_INST_PROP(n, port_index),					\
 	.tx_ring_idx = TX_RING_IDX,							\
 	.rx_ring_idx = RX_RING_IDX,							\
 	.msix = {									\

dts/bindings/ethernet/nxp,s32-netc-psi.yaml

@@ -16,6 +16,14 @@ properties:
     type: int
     description: NETC system clock frequency operation, in Hz.
 
+  port-index:
+    type: int
+    default: 0
+    enum:
+      - 0
+      - 1
+    description: Outer port of the NETC system associated with this interface.
+
   mboxes:
     required: true