rockchip: rk3368: syscon: SGRF support for OF_PLATDATA

In TPL we will need to configure security in the SGRF of the RK3368.
This change adds support for the SGRF as a syscon device, so we can
retrieve its address range through the syscon API in TPL (and can
avoid having to hard-code the address).

Signed-off-by: Philipp Tomsich <philipp.tomsich@theobroma-systems.com>
Reviewed-by: Simon Glass <sjg@chromium.org>

arch/arm/mach-rockchip/rk3368/syscon_rk3368.c

@@ -18,6 +18,8 @@ static const struct udevice_id rk3368_syscon_ids[] = {
 	  .data = ROCKCHIP_SYSCON_PMUGRF },
 	{ .compatible = "rockchip,rk3368-msch",
 	  .data = ROCKCHIP_SYSCON_MSCH },
+	{ .compatible = "rockchip,rk3368-sgrf",
+	  .data = ROCKCHIP_SYSCON_SGRF },
 	{ }
 };
 
@@ -56,4 +58,11 @@ U_BOOT_DRIVER(rockchip_rk3368_msch) = {
 	.of_match = rk3368_syscon_ids + 2,
 	.bind = rk3368_syscon_bind_of_platdata,
 };
+
+U_BOOT_DRIVER(rockchip_rk3368_sgrf) = {
+	.name = "rockchip_rk3368_sgrf",
+	.id = UCLASS_SYSCON,
+	.of_match = rk3368_syscon_ids + 3,
+	.bind = rk3368_syscon_bind_of_platdata,
+};
 #endif