drivers: usb: udc: add numaker m2l31x usbd controller

Add numaker m2l31x usbd controller

Signed-off-by: Chun-Chieh Li <[email protected]>

Author: ccli8

boards/nuvoton/numaker_m2l31ki/numaker_m2l31ki-pinctrl.dtsi

@@ -24,4 +24,14 @@
 				 <PC9MFP_GPIO>;
 		};
 	};
+
+	/* USBD multi-function pins for VBUS, D+, D-, and ID pins */
+	usbd_default: usbd_default {
+		group0 {
+			pinmux = <PA12MFP_USB_VBUS>,
+				 <PA13MFP_USB_D_N>,
+				 <PA14MFP_USB_D_P>,
+				 <PA15MFP_USB_OTG_ID>;
+		};
+	};
 };

boards/nuvoton/numaker_m2l31ki/numaker_m2l31ki.dts

@@ -35,12 +35,6 @@
 	};
 };
 
-&scc {
-	/* For USB 1.1 Host/Device/OTG, configure to 192MHz, which can generate necessary 48MHz. */
-	/* For USB 2.0 Host/Device/OTG or no USB application, comment out to use default. */
-	core-clock = <DT_FREQ_M(192)>;
-};
-
 &gpioc {
 	status = "okay";
 };
@@ -80,3 +74,10 @@
 	pinctrl-names = "default";
 	status = "okay";
 };
+
+/* On enabled, usbd is required to be clocked in 48MHz. */
+zephyr_udc0: &usbd {
+	pinctrl-0 = <&usbd_default>;
+	pinctrl-names = "default";
+	status = "okay";
+};

dts/arm/nuvoton/m2l31x.dtsi

@@ -45,6 +45,7 @@
 			reg = <0x40000200 0x100>;
 			#clock-cells = <0>;
 			lxt = "enable";
+			hirc48m = "enable";
 			clk-pclkdiv = <(NUMAKER_CLK_PCLKDIV_APB0DIV_DIV2 |
 					NUMAKER_CLK_PCLKDIV_APB1DIV_DIV2)>;
 			core-clock = <DT_FREQ_M(72)>;
@@ -388,6 +389,19 @@
 			status = "disabled";
 		};
 
+		usbd: usbd@400c0000 {
+			compatible = "nuvoton,numaker-usbd";
+			reg = <0x400c0000 0x1000>;
+			interrupts = <53 0>;
+			resets = <&rst NUMAKER_USBD_RST>;
+			clocks = <&pcc NUMAKER_USBD_MODULE NUMAKER_CLK_CLKSEL0_USBSEL_HIRC48M
+				  NUMAKER_CLK_CLKDIV0_USB(1)>;
+			dma-buffer-size = <1024>;
+			status = "disabled";
+			num-bidir-endpoints = <19>;
+			disallow-iso-in-out-same-number;
+		};
+
 		wwdt: watchdog@40096000 {
 			compatible = "nuvoton,numaker-wwdt";
 			reg = <0x40096000 0x10>;