rp2040: enable usb device and usb serial console

Author: pennam

variants/rpi_pico_rp2040/rpi_pico_rp2040.conf

@@ -0,0 +1,10 @@
+CONFIG_USB_DEVICE_STACK=y
+CONFIG_USB_DEVICE_PRODUCT="Raspberry Pi Pico"
+CONFIG_USB_DEVICE_MANUFACTURER="Raspberry Pi"
+CONFIG_USB_DEVICE_VID=0x2E8A
+CONFIG_USB_DEVICE_PID=0x00C0
+
+CONFIG_SERIAL=y
+CONFIG_CONSOLE=y
+CONFIG_UART_CONSOLE=y
+CONFIG_UART_LINE_CTRL=y

variants/rpi_pico_rp2040/rpi_pico_rp2040.overlay

@@ -78,7 +78,8 @@
 				<&adc 1>,
 				<&adc 2>;
 
-		serials = <&pico_serial>;
+		serials = <&board_cdc_acm_uart>, <&pico_serial>;
+		cdc-acm = <&board_cdc_acm_uart>;
 		i2cs = <&pico_i2c0>;
 		spis = <&pico_spi>;
 	};
@@ -199,10 +200,17 @@
 	};
 };
 
+&zephyr_udc0 {
+    board_cdc_acm_uart: board_cdc_acm_uart {
+	    compatible = "zephyr,cdc-acm-uart";
+		status = "okay";
+    };
+};
+
 &flash0 {
 	partitions {
 		user_sketch: partition@e0000 {
 			reg = <0x0E0000 0x20000>;
 		};
 	};
-};
+};