rockchip: add core px30 headers

Add headers needed by the upcoming px30 support, including two
new dt-binding headers taken from the Linux kernel.

Signed-off-by: Heiko Stuebner <heiko.stuebner@theobroma-systems.com>
Reviewed-by: Kever Yang <kever.yang@rock-chips.com>
diff --git a/include/dt-bindings/soc/rockchip,boot-mode.h b/include/dt-bindings/soc/rockchip,boot-mode.h
new file mode 100644
index 0000000..4b0914c
--- /dev/null
+++ b/include/dt-bindings/soc/rockchip,boot-mode.h
@@ -0,0 +1,16 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+#ifndef __ROCKCHIP_BOOT_MODE_H
+#define __ROCKCHIP_BOOT_MODE_H
+
+/*high 24 bits is tag, low 8 bits is type*/
+#define REBOOT_FLAG		0x5242C300
+/* normal boot */
+#define BOOT_NORMAL		(REBOOT_FLAG + 0)
+/* enter bootloader rockusb mode */
+#define BOOT_BL_DOWNLOAD	(REBOOT_FLAG + 1)
+/* enter recovery */
+#define BOOT_RECOVERY		(REBOOT_FLAG + 3)
+ /* enter fastboot mode */
+#define BOOT_FASTBOOT		(REBOOT_FLAG + 9)
+
+#endif