Use ROCKCHIP_BOOT_MODE_REG instead of grf structure so that
we can re-use the source code later.

Signed-off-by: Kever Yang <kever.y...@rock-chips.com>
---

 arch/arm/mach-rockchip/rk322x-board.c | 5 +----
 1 file changed, 1 insertion(+), 4 deletions(-)

diff --git a/arch/arm/mach-rockchip/rk322x-board.c 
b/arch/arm/mach-rockchip/rk322x-board.c
index 7366d45ab6..61863d7424 100644
--- a/arch/arm/mach-rockchip/rk322x-board.c
+++ b/arch/arm/mach-rockchip/rk322x-board.c
@@ -142,12 +142,9 @@ int board_usb_cleanup(int index, enum usb_init_type init)
 #if CONFIG_IS_ENABLED(FASTBOOT)
 int fastboot_set_reboot_flag(void)
 {
-       struct rk322x_grf *grf;
-
        printf("Setting reboot to fastboot flag ...\n");
-       grf = syscon_get_first_range(ROCKCHIP_SYSCON_GRF);
        /* Set boot mode to fastboot */
-       writel(BOOT_FASTBOOT, &grf->os_reg[0]);
+       writel(BOOT_FASTBOOT, CONFIG_ROCKCHIP_BOOT_MODE_REG);
 
        return 0;
 }
-- 
2.18.0

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