diff --git a/Documentation/devicetree/bindings/mailbox/hisilicon,hi3660-mailbox.txt b/Documentation/devicetree/bindings/mailbox/hisilicon,hi3660-mailbox.txt
deleted file mode 100644
index 3e5b4537407d..000000000000
--- a/Documentation/devicetree/bindings/mailbox/hisilicon,hi3660-mailbox.txt
+++ /dev/null
@@ -1,51 +0,0 @@
-Hisilicon Hi3660 Mailbox Controller
-
-Hisilicon Hi3660 mailbox controller supports up to 32 channels.  Messages
-are passed between processors, including application & communication
-processors, MCU, HIFI, etc.  Each channel is unidirectional and accessed
-by using MMIO registers; it supports maximum to 8 words message.
-
-Controller
-----------
-
-Required properties:
-- compatible:		: Shall be "hisilicon,hi3660-mbox"
-- reg:			: Offset and length of the device's register set
-- #mbox-cells:		: Must be 3
-			  <&phandle channel dst_irq ack_irq>
-			    phandle	: Label name of controller
-			    channel	: Channel number
-			    dst_irq	: Remote interrupt vector
-			    ack_irq	: Local interrupt vector
-
-- interrupts:		: Contains the two IRQ lines for mailbox.
-
-Example:
-
-mailbox: mailbox@e896b000 {
-	compatible = "hisilicon,hi3660-mbox";
-	reg = <0x0 0xe896b000 0x0 0x1000>;
-	interrupts = <0x0 0xc0 0x4>,
-		     <0x0 0xc1 0x4>;
-	#mbox-cells = <3>;
-};
-
-Client
-------
-
-Required properties:
-- compatible		: See the client docs
-- mboxes		: Standard property to specify a Mailbox (See ./mailbox.txt)
-			  Cells must match 'mbox-cells' (See Controller docs above)
-
-Optional properties
-- mbox-names		: Name given to channels seen in the 'mboxes' property.
-
-Example:
-
-stub_clock: stub_clock@e896b500 {
-	compatible = "hisilicon,hi3660-stub-clk";
-	reg = <0x0 0xe896b500 0x0 0x0100>;
-	#clock-cells = <1>;
-	mboxes = <&mailbox 13 3 0>;
-};
diff --git a/Documentation/devicetree/bindings/mailbox/hisilicon,hi3660-mbox.yaml b/Documentation/devicetree/bindings/mailbox/hisilicon,hi3660-mbox.yaml
new file mode 100644
index 000000000000..c42ce576a029
--- /dev/null
+++ b/Documentation/devicetree/bindings/mailbox/hisilicon,hi3660-mbox.yaml
@@ -0,0 +1,57 @@
+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/hisilicon,hi3660-mbox.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Hisilicon Hi3660 Mailbox Controller
+
+maintainers:
+  - Wei Xu <xuwei5@hisilicon.com>
+
+description:
+  Hisilicon Hi3660 mailbox controller supports up to 32 channels.  Messages
+  are passed between processors, including application & communication
+  processors, MCU, HIFI, etc.  Each channel is unidirectional and accessed
+  by using MMIO registers; it supports maximum to 8 words message.
+
+properties:
+  compatible:
+    items:
+      - const: hisilicon,hi3660-mbox
+
+  reg:
+    maxItems: 1
+
+  interrupts:
+    description: Mailbox interrupt vectors for message processing
+    maxItems: 2
+
+  '#mbox-cells':
+    description: >
+      The cells content are as follows:
+        - Channel number
+        - Remote destination interrupt vector
+        - Local ack interrupt vector
+    const: 3
+
+required:
+  - compatible
+  - reg
+  - interrupts
+  - '#mbox-cells'
+
+additionalProperties: false
+
+examples:
+  - |
+    #include <dt-bindings/interrupt-controller/arm-gic.h>
+    #include <dt-bindings/interrupt-controller/irq.h>
+
+    mailbox@e896b000 {
+        compatible = "hisilicon,hi3660-mbox";
+        reg = <0xe896b000 0x1000>;
+        interrupts = <GIC_SPI 0xc0 IRQ_TYPE_LEVEL_HIGH>,
+                     <GIC_SPI 0xc1 IRQ_TYPE_LEVEL_HIGH>;
+        #mbox-cells = <3>;
+    };