renesas/rusb2: add support for RA MCUs with USBFS device-only support

src/portable/renesas/rusb2/dcd_rusb2.c

@@ -51,10 +51,10 @@ static dcd_data_t _dcd;
 // - Pipes 3 to 5: Bulk
 // - Pipes 6 to 9: Interrupt
 //
-// Note: for small mcu such as
-// - RA2A1: only pipe 4-7 are available, and no support for ISO
+// Note: for small mcu which only support device mode
+// only pipe 4-7 are available, and no support for ISO
 static unsigned find_pipe(unsigned xfer_type) {
-  #if defined(BSP_MCU_GROUP_RA2A1)
+  #ifdef RUSB2_RA_USBFS_DEVICE_ONLY
   const uint8_t pipe_idx_arr[4][2] = {
       { 0, 0 }, // Control
       { 0, 0 }, // Isochronous not supported

src/portable/renesas/rusb2/hcd_rusb2.c

@@ -11,6 +11,10 @@
 
 #if CFG_TUH_ENABLED && defined(TUP_USBIP_RUSB2)
 
+#ifdef RUSB2_RA_USBFS_DEVICE_ONLY
+#error "Host mode not supported for this device"
+#endif
+
 #include "host/hcd.h"
 #include "host/usbh.h"
 #include "rusb2_common.h"

src/portable/renesas/rusb2/rusb2_common.h

@@ -14,8 +14,8 @@
 #elif TU_CHECK_MCU(OPT_MCU_RAXXX)
   #include "rusb2_ra.h"
 
-  // Hack for D0FIFO definitions on RA Cortex-M23
-  #if defined(RENESAS_CORTEX_M23)
+  // Hack for D0FIFO definitions on RA with usb device support only
+  #ifdef RUSB2_RA_USBFS_DEVICE_ONLY
     #define D0FIFO      CFIFO
     #define D0FIFOSEL   CFIFOSEL
     #define D0FIFOSEL_b CFIFOSEL_b

src/portable/renesas/rusb2/rusb2_ra.h

@@ -38,6 +38,10 @@ extern "C" {
 //
 //--------------------------------------------------------------------+
 
+#if defined(BSP_MCU_GROUP_RA2A1) || defined(BSP_MCU_GROUP_RA2L2) || defined(BSP_MCU_GROUP_RA4E2) || defined(BSP_MCU_GROUP_RA6E2) || defined(BSP_MCU_GROUP_RA6T3)
+#define RUSB2_RA_USBFS_DEVICE_ONLY
+#endif
+
 typedef struct {
   uint32_t reg_base;
   int32_t irqnum;