realtek: tl-sg2xxx: read MAC address from nvmem-cells

The TP-Link RTL83xx based switches have their MAC address programmed
in the "para" partition. While in theory, the format of this partition
is dynamic, in practice, the MAC address appears to be located at a
consistent address. Thus, use nvmem-cells to read this MAC address.

The main MAC is required for deriving the MAC address of the switch
ports. Instead of reading it via mtd_get_mac_binary(), alias the
ethernet0 node as the label-mac-device, and use get_mac_label().

Signed-off-by: Alexandru Gagniuc <[email protected]>

target/linux/realtek/base-files/etc/board.d/02_network

@@ -41,7 +41,7 @@ hpe,1920-24g)
 	;;
 tplink,sg2008p-v1|\
 tplink,sg2452p-v4)
-	label_mac=$(mtd_get_mac_binary para 0xfdff4)
+	label_mac=$(get_mac_label)
 	lan_mac="$label_mac"
 	;;
 *)

target/linux/realtek/dts-5.10/rtl8380_tplink_sg2xxx.dtsi

@@ -11,6 +11,7 @@
 		led-failsafe = &led_power;
 		led-running = &led_power;
 		led-upgrade = &led_power;
+		label-mac-device = &ethernet0;
 	};
 
 	memory@0 {
@@ -128,15 +129,25 @@
 				reg = <0x1b00000 0x400000>;
 			};
 			partition@1f00000 {
+				compatible = "nvmem-cells";
 				label = "para";
 				reg = <0x1f00000 0x100000>;
+				#address-cells = <1>;
+				#size-cells = <1>;
 				read-only;
+
+				factory_macaddr: macaddr@fdff4 {
+					reg = <0xfdff4 0x6>;
+				};
 			};
 		};
 	};
 };
 
 &ethernet0 {
+	nvmem-cells = <&factory_macaddr>;
+	nvmem-cell-names = "mac-address";
+
 	mdio: mdio-bus {
 		compatible = "realtek,rtl838x-mdio";
 		#address-cells = <1>;

target/linux/realtek/dts-5.10/rtl8393_tplink_sg2452p-v4.dts

@@ -20,6 +20,7 @@
 		led-failsafe = &led_sys;
 		led-running = &led_sys;
 		led-upgrade = &led_sys;
+		label-mac-device = &ethernet0;
 	};
 
 	chosen {
@@ -261,15 +262,25 @@
 				reg = <0x1b00000 0x400000>;
 			};
 			partition@1f00000 {
+				compatible = "nvmem-cells";
 				label = "para";
 				reg = <0x1f00000 0x100000>;
+				#address-cells = <1>;
+				#size-cells = <1>;
 				read-only;
+
+				factory_macaddr: macaddr@fdff4 {
+					reg = <0xfdff4 0x6>;
+				};
 			};
 		};
 	};
 };
 
 &ethernet0 {
+	nvmem-cells = <&factory_macaddr>;
+	nvmem-cell-names = "mac-address";
+
 	mdio: mdio-bus {
 		compatible = "realtek,rtl838x-mdio";
 		#address-cells = <1>;