rockchip: dts: tinker: Add tinker-s board support

Support tinker-s board. The board is equivalent of tinker board
except of emmc.

TODO:
- support of usb current burst when the board is powered from pc

Signed-off-by: Michael Trimarchi <michael@amarulasolutions.com>
Reviewed-by: Kever Yang <kever.yang@rock-chips.com>
diff --git a/arch/arm/dts/rk3288-tinker-s-u-boot.dtsi b/arch/arm/dts/rk3288-tinker-s-u-boot.dtsi
new file mode 100644
index 0000000..a177fca
--- /dev/null
+++ b/arch/arm/dts/rk3288-tinker-s-u-boot.dtsi
@@ -0,0 +1,34 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * Copyright (C) 2019 Amarula Solutions SRO
+ */
+
+#include "rk3288-u-boot.dtsi"
+#include "rk3288-tinker-u-boot.dtsi"
+
+/ {
+	chosen {
+		u-boot,spl-boot-order = \
+			"same-as-spl", &sdmmc, &emmc;
+	};
+};
+
+&emmc {
+	u-boot,dm-spl;
+};
+
+&emmc_clk {
+	u-boot,dm-spl;
+};
+
+&emmc_cmd {
+	u-boot,dm-spl;
+};
+
+&emmc_pwr {
+	u-boot,dm-spl;
+};
+
+&emmc_bus8 {
+	u-boot,dm-spl;
+};