arch: arm: rockchip: Add initial support for RK3528

Rockchip RK3528 is a ARM-based SoC with quad-core Cortex-A53.

Add initial arch support for the RK3528 SoC.

Signed-off-by: Jonas Karlman <jonas@kwiboo.se>
Reviewed-by: Kever Yang <kever.yang@rock-chips.com>
diff --git a/arch/arm/mach-rockchip/rk3528/syscon_rk3528.c b/arch/arm/mach-rockchip/rk3528/syscon_rk3528.c
new file mode 100644
index 0000000..4a32a5f
--- /dev/null
+++ b/arch/arm/mach-rockchip/rk3528/syscon_rk3528.c
@@ -0,0 +1,19 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+// Copyright Contributors to the U-Boot project.
+
+#include <dm.h>
+#include <asm/arch-rockchip/clock.h>
+
+static const struct udevice_id rk3528_syscon_ids[] = {
+	{ .compatible = "rockchip,rk3528-grf", .data = ROCKCHIP_SYSCON_GRF },
+	{ }
+};
+
+U_BOOT_DRIVER(rockchip_rk3528_syscon) = {
+	.name = "rockchip_rk3528_syscon",
+	.id = UCLASS_SYSCON,
+	.of_match = rk3528_syscon_ids,
+#if CONFIG_IS_ENABLED(OF_REAL)
+	.bind = dm_scan_fdt_dev,
+#endif
+};