drm/radeon/kms: add NI chip families

Signed-off-by: Alex Deucher <alexdeucher@gmail.com>
Signed-off-by: Dave Airlie <airlied@redhat.com>
diff --git a/drivers/gpu/drm/radeon/radeon.h b/drivers/gpu/drm/radeon/radeon.h
index 396e307..73730fd 100644
--- a/drivers/gpu/drm/radeon/radeon.h
+++ b/drivers/gpu/drm/radeon/radeon.h
@@ -1337,6 +1337,7 @@
 #define ASIC_IS_DCE4(rdev) ((rdev->family >= CHIP_CEDAR))
 #define ASIC_IS_DCE41(rdev) ((rdev->family >= CHIP_PALM) && \
 			     (rdev->flags & RADEON_IS_IGP))
+#define ASIC_IS_DCE5(rdev) ((rdev->family >= CHIP_BARTS))
 
 /*
  * BIOS helpers.