diff --git a/src/soc/rockchip/rk3399/clock.c b/src/soc/rockchip/rk3399/clock.c
index cb7b400..db4ec3d 100644
--- a/src/soc/rockchip/rk3399/clock.c
+++ b/src/soc/rockchip/rk3399/clock.c
@@ -15,6 +15,11 @@
  */
 
 #include <soc/clock.h>
+#include <soc/grf.h>
+
+struct rk3399_grf_regs * const rk3399_grf = (void *)GRF_BASE;
+struct rk3399_pmugrf_regs * const rk3399_pmugrf = (void *)PMUGRF_BASE;
+struct rk3399_pmusgrf_regs * const rk3399_pmusgrf = (void *)PMUSGRF_BASE;
 
 void rkclk_configure_spi(unsigned int bus, unsigned int hz)
 {