diff --git a/target/linux/mediatek/files-5.4/include/dt-bindings/regulator/richtek,rt5190a-regulator.h b/target/linux/mediatek/files-5.4/include/dt-bindings/regulator/richtek,rt5190a-regulator.h
new file mode 100644
index 0000000..63f99d4
--- /dev/null
+++ b/target/linux/mediatek/files-5.4/include/dt-bindings/regulator/richtek,rt5190a-regulator.h
@@ -0,0 +1,15 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+
+#ifndef __DT_BINDINGS_RICHTEK_RT5190A_REGULATOR_H__
+#define __DT_BINDINGS_RICHTEK_RT5190A_REGULATOR_H__
+
+/*
+ * BUCK/LDO mode constants which may be used in devicetree properties
+ * (eg. regulator-allowed-modes).
+ * See the manufacturer's datasheet for more information on these modes.
+ */
+
+#define RT5190A_OPMODE_AUTO	0
+#define RT5190A_OPMODE_FPWM	1
+
+#endif