drivers/built-in.o: In function `qe_usb_clock_set':
drivers/soc/fsl/qe/usb.c:25: undefined reference to `qe_immr'
drivers/soc/fsl/qe/usb.c:25: undefined reference to `qe_immr'
drivers/soc/fsl/qe/usb.c:48: undefined reference to `cmxgcr_lock'
drivers/soc/fsl/qe/usb.c:48: undefined reference to `cmxgcr_lock'
drivers/soc/fsl/qe/usb.c:46: undefined reference to `qe_setbrg'
Makefile:965: recipe for target 'vmlinux' failed
make[2]: *** [vmlinux] Error 1