poc drm-subtree as modules. (requires some changes for 15-current which are done but not shared yet)

build.sh

for sfx  in "drm" "anx" "vop" 
do
echo $sfx
make -f "Makefile.${sfx}" clean 
make -f "Makefile.${sfx}" depend  clean 
make -f "Makefile.${sfx}"
make -f Makefile.${sfx} DESTDIR=$ROOTFS install
done;

Makefile

KMOD     = drm_kmod
MFILES+=dw_hdmi_if.m	rk_vop_if.m


SYSDIR?=${SRCTOP}/sys
.include "${SYSDIR}/conf/kern.opts.mk"
CFLAGS= -I./drmkpi/include/  -I./core/include/ -include drmkpi/include/drm/drm_os_freebsd.h -I./core/include/uapi/ -Wno-error=gnu-pointer-arith -Wno-error=missing-prototypes -Wno-error=format -Wno-error=cast-qual -Wno-error=unused-but-set-variable '-DKBUILD_MODNAME="DRMv5.8"'

SRCS+=device_if.h bus_if.h vnode_if.h pci_if.h opt_platform.h ofw_bus_if.h clknode_if.h phynode_if.h \
dw_hdmi_if.c	rk_vop_if.c \
core/drm_atomic_state_helper.c \
core/drm_atomic.c \
core/drm_atomic_helper.c \
core/drm_atomic_uapi.c \
core/drm_auth.c \
core/drm_blend.c \
core/drm_bridge.c \
core/drm_cache.c \
core/drm_client.c \
core/drm_client_modeset.c \
core/drm_color_mgmt.c \
core/drm_connector.c \
core/drm_crtc.c \
core/drm_crtc_helper.c \
core/drm_dp_helper.c \
core/drm_damage_helper.c \
core/drm_drv.c \
core/drm_dumb_buffers.c \
core/drm_edid.c \
core/drm_encoder.c \
core/drm_fb_helper.c \
core/drm_file.c \
core/drm_flip_work.c \
core/drm_fourcc.c \
core/drm_framebuffer.c \
core/drm_gem.c \
core/drm_hashtab.c \
core/drm_ioc32.c \
core/drm_ioctl.c \
core/drm_kms_helper_common.c \
core/drm_memory.c \
core/drm_mm.c \
core/drm_mode_config.c \
core/drm_mode_object.c \
core/drm_modes.c \
core/drm_modeset_helper.c \
core/drm_modeset_lock.c \
core/drm_panel.c \
core/drm_panel_orientation_quirks.c \
core/drm_plane.c \
core/drm_plane_helper.c \
core/drm_prime.c \
core/drm_print.c \
core/drm_probe_helper.c \
core/drm_property.c \
core/drm_rect.c \
core/drm_self_refresh_helper.c \
core/drm_scdc_helper.c \
core/drm_syncobj.c \
core/drm_vblank.c \
core/drm_vma_manager.c \
core/scheduler/sched_entity.c \
core/scheduler/sched_fence.c \
core/scheduler/sched_main.c \
freebsd/drm_gem_cma_helper.c \
freebsd/drm_gem_framebuffer_helper.c \
freebsd/drm_fb_cma_helper.c \
freebsd/drm_fbdev.c \
freebsd/drm_os_freebsd.c \
freebsd/drm_sysctl.c \
freebsd/drm_sysfs.c \
drmkpi/drmcompat_compat.c \
drmkpi/drmcompat_completion.c \
drmkpi/drmcompat_dma_buf.c \
drmkpi/drmcompat_dma_fence.c \
drmkpi/drmcompat_dma_fence_chain.c \
drmkpi/drmcompat_dma_resv.c \
drmkpi/drmcompat_idr.c \
drmkpi/drmcompat_kthread.c \
drmkpi/drmcompat_list_sort.c \
drmkpi/drmcompat_lock.c \
drmkpi/drmcompat_page.c \
drmkpi/drmcompat_page1.c \
drmkpi/drmcompat_rcu.c \
drmkpi/drmcompat_schedule.c \
drmkpi/drmcompat_slab.c \
drmkpi/drmcompat_sync_file.c \
drmkpi/drmcompat_timer.c \
drmkpi/drmcompat_work.c \
drmkpi/hdmi.c \
drmkpi/drmcompat_sort.c \
kmod.c

.include <bsd.kmod.mk>

Makefile.anx

KMOD     = rk_anxdp

SYSDIR?=${SRCTOP}/sys
.include "${SYSDIR}/conf/kern.opts.mk"
CFLAGS= -I./../../ -I../drmkpi/include/  -I../core/include/ -include ../drmkpi/include/drm/drm_os_freebsd.h -I../core/include/uapi/ -Wno-error=gnu-pointer-arith -DFDT

SRCS=device_if.h bus_if.h vnode_if.h pci_if.h opt_platform.h ofw_bus_if.h clknode_if.h fb_if.h  syscon_if.h iicbus_if.h phynode_if.h rk_anxdp.c ../bridges/anxdp/anx_dp.c ../bridges/dw_hdmi/dw_hdmi_if.h



.include <bsd.kmod.mk>

Makefile.drm

KMOD     = rk_drm

SYSDIR?=${SRCTOP}/sys
.include "${SYSDIR}/conf/kern.opts.mk"
CFLAGS= -I./../../ -I../drmkpi/include/  -I../core/include/ -include ../drmkpi/include/drm/drm_os_freebsd.h -I../core/include/uapi/ -Wno-error=gnu-pointer-arith -DFDT

SRCS=device_if.h bus_if.h vnode_if.h pci_if.h opt_platform.h ofw_bus_if.h clknode_if.h rk_vop_if.h fb_if.h  rk_vop_if.h syscon_if.h iicbus_if.h phynode_if.h rk_drm.c rk_gem.c 




.include <bsd.kmod.mk>

Makefile.vop

KMOD     = rk_vop
dw_hdmi_if.h:
	awk -f /usr/src/sys/tools/makeobjops.awk ../bridges/dw_hdmi/dw_hdmi_if.m -h

SYSDIR?=${SRCTOP}/sys
.include "${SYSDIR}/conf/kern.opts.mk"
CFLAGS= -I./../../ -I../drmkpi/include/  -I../core/include/ -include ../drmkpi/include/drm/drm_os_freebsd.h -I../core/include/uapi/ -Wno-error=gnu-pointer-arith -DFDT -Wno-error=format

SRCS=device_if.h bus_if.h vnode_if.h pci_if.h opt_platform.h ofw_bus_if.h clknode_if.h rk_vop_if.h fb_if.h phynode_if.h  rk_vop.c rk_plane.c



.include <bsd.kmod.mk>