Support for NXP RW612 (compatible with MCXN9)

[gab-k]

Hi everyone, The RW612 seems to use the same USB IP (ehci/ci_hs) as the MCXN9 series from NXP, so it might be sensible to formally add support?

I got the cdc_dual_ports and audio_headset examples working fine on a FRDM-RW612 eval board by just defining these:

#ifndef CFG_TUSB_MCU
#define CFG_TUSB_MCU OPT_MCU_MCXN9
#endif

#ifndef USBHS1__USBC_BASE
#define USBHS1__USBC_BASE USBOTG_BASE
#endif

#ifndef USB1_HS_IRQn
#define USB1_HS_IRQn USB_IRQn
#endif

The USB base address and IRQ number are defined differently inside the freescale/nxp headers for context.

I checked the register documentation for both the MCXN9 and RW612 and they seem to match pretty much exactly with the exception of some minor details. I haven't really tested this in depth yet, so keep that in mind.

I am happy to open a PR to add formal support, but I would appreciate some guidance on the preferred structure.

I assume it requires at least the following:

• Adding OPT_MCU_RW612 to tusb_option.h.
• Creating a new ci_hs_rw612.h header file inside portable/chipidea/ci_hs (analogous to ci_hs_mcx.h)?

Or would you prefer I modify the existing MCX header to accommodate both? Thanks!

[HiFiPhile]

Hi, thank you for the test, I've compared the ID register with RT1170 which are indeed identical.

I assume it requires at least the following:

• Adding OPT_MCU_RW612 to tusb_option.h.
• Creating a new ci_hs_rw612.h header file inside portable/chipidea/ci_hs (analogous to ci_hs_mcx.h)?

Yeah basically that's what's need to be done, you can create a ci_hs_rw61x.h header, please also add it to README.rst.

If you are willing to add FRDM-RW612 BSP it's even better :)