Add Raspberry Pi Zero W and Zero 2 W

These are different Broadcom chips. The peripherals are essentially
the same. The main differences are:
* The CPU(s)
* The interrupt controller
* The peripheral base address (but not the peripherals that we use)

src/device/dcd_attr.h

@@ -190,7 +190,7 @@
   #define DCD_ATTR_ENDPOINT_MAX   4
 
 //------------- Broadcom -------------//
-#elif TU_CHECK_MCU(OPT_MCU_BCM2711)
+#elif TU_CHECK_MCU(OPT_MCU_BCM2711, OPT_MCU_BCM2835, OPT_MCU_BCM2837)
   #define DCD_ATTR_ENDPOINT_MAX   8
 
 //------------- Broadcom -------------//

src/portable/synopsys/dwc2/dcd_dwc2.c

@@ -33,7 +33,8 @@
 #if TUSB_OPT_DEVICE_ENABLED && \
     ( defined(DCD_ATTR_DWC2_STM32) || \
       TU_CHECK_MCU(OPT_MCU_ESP32S2, OPT_MCU_ESP32S3, OPT_MCU_GD32VF103) || \
-      TU_CHECK_MCU(OPT_MCU_EFM32GG, OPT_MCU_BCM2711, OPT_MCU_XMC4000) )
+      TU_CHECK_MCU(OPT_MCU_EFM32GG, OPT_MCU_BCM2711, OPT_MCU_BCM2835) || \
+      TU_CHECK_MCU(OPT_MCU_BCM2837, OPT_MCU_XMC4000) )
 
 #include "device/dcd.h"
 #include "dwc2_type.h"
@@ -44,7 +45,7 @@
   #include "dwc2_esp32.h"
 #elif TU_CHECK_MCU(OPT_MCU_GD32VF103)
   #include "dwc2_gd32.h"
-#elif TU_CHECK_MCU(OPT_MCU_BCM2711)
+#elif TU_CHECK_MCU(OPT_MCU_BCM2711, OPT_MCU_BCM2835, OPT_MCU_BCM2837)
   #include "dwc2_bcm.h"
 #elif TU_CHECK_MCU(OPT_MCU_EFM32GG)
   #include "dwc2_efm32.h"

src/portable/synopsys/dwc2/dwc2_bcm.h

@@ -31,6 +31,7 @@
  extern "C" {
 #endif
 
+#include "broadcom/defines.h"
 #include "broadcom/interrupts.h"
 #include "broadcom/caches.h"
 
@@ -47,7 +48,6 @@ static inline void dwc2_dcd_int_enable(uint8_t rhport)
 {
   (void) rhport;
   BP_EnableIRQ(USB_IRQn);
-  __asm__ volatile("isb"); // needed if TIMER1 IRQ is not enabled !?
 }
 
 TU_ATTR_ALWAYS_INLINE
@@ -55,7 +55,6 @@ static inline void dwc2_dcd_int_disable (uint8_t rhport)
 {
   (void) rhport;
   BP_DisableIRQ(USB_IRQn);
-  __asm__ volatile("isb"); // needed if TIMER1 IRQ is not enabled !?
 }
 
 static inline void dwc2_remote_wakeup_delay(void)

src/tusb_option.h

@@ -132,6 +132,8 @@
 
 // Broadcom
 #define OPT_MCU_BCM2711          1700 ///< Broadcom BCM2711
+#define OPT_MCU_BCM2835          1701 ///< Broadcom BCM2835
+#define OPT_MCU_BCM2837          1702 ///< Broadcom BCM2837
 
 // Infineon
 #define OPT_MCU_XMC4000          1800 ///< Infineon XMC4000