drivers: eth_mcux: Enable specifying PHY addr for enet module

PHY addr is not always 0 on boards with multiple PHYs. Allow specifying
via devicetree.

Signed-off-by: Daniel DeGrasse <daniel.degrasse@nxp.com>

drivers/ethernet/eth_mcux.c

@@ -1392,7 +1392,7 @@ static void eth_mcux_err_isr(const struct device *dev)
 	static struct eth_context eth##n##_context = {			\
 		.base = (ENET_Type *)DT_INST_REG_ADDR(n),		\
 		.config_func = eth##n##_config_func,			\
-		.phy_addr = 0U,						\
+		.phy_addr = DT_INST_PROP(n, phy_addr),		\
 		.phy_duplex = kPHY_FullDuplex,				\
 		.phy_speed = kPHY_Speed100M,				\
 		.phy_handle = &eth##n##_phy_handle,			\

dts/arm/nxp/nxp_k6x.dtsi

@@ -504,6 +504,7 @@
 			interrupt-names = "TX", "RX", "ERR";
 			status = "disabled";
 			label = "ETH_0";
+			phy-addr = <0>;
 			clocks = <&sim KINETIS_SIM_CORESYS_CLK 0 0>;
 			ptp {
 				compatible = "nxp,kinetis-ptp";

dts/arm/nxp/nxp_rt.dtsi

@@ -573,6 +573,7 @@
 			interrupt-names = "COMMON";
 			status = "disabled";
 			label = "ETH_0";
+			phy-addr = <0>;
 			ptp {
 				compatible = "nxp,kinetis-ptp";
 				status = "disabled";

dts/arm/nxp/nxp_rt11xx.dtsi

@@ -661,6 +661,7 @@
 			interrupt-names = "COMMON";
 			status = "disabled";
 			label = "ETH_0";
+			phy-addr = <2>;
 			ptp {
 				compatible = "nxp,kinetis-ptp";
 				status = "disabled";

dts/bindings/ethernet/nxp,kinetis-ethernet.yaml

@@ -12,3 +12,7 @@ properties:
       required: true
     interrupts:
       required: true
+    phy-addr:
+      type: int
+      description: Address of the phy controller
+      required: true