diff --git a/Documentation/devicetree/bindings/mailbox/omap-mailbox.txt b/Documentation/devicetree/bindings/mailbox/omap-mailbox.txt
deleted file mode 100644
index 12371f5c6cd9..000000000000
--- a/Documentation/devicetree/bindings/mailbox/omap-mailbox.txt
+++ /dev/null
@@ -1,184 +0,0 @@
-OMAP2+ and K3 Mailbox
-=====================
-
-The OMAP mailbox hardware facilitates communication between different processors
-using a queued mailbox interrupt mechanism. The IP block is external to the
-various processor subsystems and is connected on an interconnect bus. The
-communication is achieved through a set of registers for message storage and
-interrupt configuration registers.
-
-Each mailbox IP block/cluster has a certain number of h/w fifo queues and output
-interrupt lines. An output interrupt line is routed to an interrupt controller
-within a processor subsystem, and there can be more than one line going to a
-specific processor's interrupt controller. The interrupt line connections are
-fixed for an instance and are dictated by the IP integration into the SoC
-(excluding the SoCs that have a Interrupt Crossbar IP). Each interrupt line is
-programmable through a set of interrupt configuration registers, and have a rx
-and tx interrupt source per h/w fifo. Communication between different processors
-is achieved through the appropriate programming of the rx and tx interrupt
-sources on the appropriate interrupt lines.
-
-The number of h/w fifo queues and interrupt lines dictate the usable registers.
-All the current OMAP SoCs except for the newest DRA7xx SoC has a single IP
-instance. DRA7xx has multiple instances with different number of h/w fifo queues
-and interrupt lines between different instances. The interrupt lines can also be
-routed to different processor sub-systems on DRA7xx as they are routed through
-the Crossbar, a kind of interrupt router/multiplexer. The K3 AM65x and J721E
-SoCs has each of these instances form a cluster and combine multiple clusters
-into a single IP block present within the Main NavSS. The interrupt lines from
-all these clusters are multiplexed and routed to different processor subsystems
-over a limited number of common interrupt output lines of an Interrupt Router.
-The AM64x SoCS also uses a single IP block comprising of multiple clusters,
-but the number of clusters are smaller, and the interrupt output lines are
-connected directly to various processors.
-
-Mailbox Device Node:
-====================
-A Mailbox device node is used to represent a Mailbox IP instance/cluster within
-a SoC. The sub-mailboxes are represented as child nodes of this parent node.
-
-Required properties:
---------------------
-- compatible:		Should be one of the following,
-			    "ti,omap2-mailbox" for OMAP2420, OMAP2430 SoCs
-			    "ti,omap3-mailbox" for OMAP3430, OMAP3630 SoCs
-			    "ti,omap4-mailbox" for OMAP44xx, OMAP54xx, AM33xx,
-						   AM43xx and DRA7xx SoCs
-			    "ti,am654-mailbox" for K3 AM65x and J721E SoCs
-			    "ti,am64-mailbox" for K3 AM64x SoCs
-- reg:			Contains the mailbox register address range (base
-			address and length)
-- interrupts:		Contains the interrupt information for the mailbox
-			device. The format is dependent on which interrupt
-			controller the Mailbox device uses
-- #mbox-cells:		Common mailbox binding property to identify the number
-			of cells required for the mailbox specifier. Should be
-			1
-- ti,mbox-num-users:	Number of targets (processor devices) that the mailbox
-			device can interrupt
-- ti,mbox-num-fifos:	Number of h/w fifo queues within the mailbox IP block
-
-SoC-specific Required properties:
----------------------------------
-The following are mandatory properties for the OMAP architecture based SoCs
-only:
-- ti,hwmods:		Name of the hwmod associated with the mailbox. This
-			should be defined in the mailbox node only if the node
-			is not defined as a child node of a corresponding sysc
-			interconnect node.
-
-The following are mandatory properties for the K3 AM65x and J721E SoCs only:
-- interrupt-parent:	Should contain a phandle to the TI-SCI interrupt
-			controller node that is used to dynamically program
-			the interrupt routes between the IP and the main GIC
-			controllers. See the following binding for additional
-			details,
-			Documentation/devicetree/bindings/interrupt-controller/ti,sci-intr.yaml
-
-Child Nodes:
-============
-A child node is used for representing the actual sub-mailbox device that is
-used for the communication between the host processor and a remote processor.
-Each child node should have a unique node name across all the different
-mailbox device nodes.
-
-Required properties:
---------------------
-- ti,mbox-tx:		sub-mailbox descriptor property defining a Tx fifo
-- ti,mbox-rx:		sub-mailbox descriptor property defining a Rx fifo
-
-Sub-mailbox Descriptor Data
----------------------------
-Each of the above ti,mbox-tx and ti,mbox-rx properties should have 3 cells of
-data that represent the following:
-    Cell #1 (fifo_id) - mailbox fifo id used either for transmitting
-                        (ti,mbox-tx) or for receiving (ti,mbox-rx)
-    Cell #2 (irq_id)  - irq identifier index number to use from the parent's
-                        interrupts data. Should be 0 for most of the cases, a
-                        positive index value is seen only on mailboxes that have
-                        multiple interrupt lines connected to the MPU processor.
-    Cell #3 (usr_id)  - mailbox user id for identifying the interrupt line
-                        associated with generating a tx/rx fifo interrupt.
-
-Optional Properties:
---------------------
-- ti,mbox-send-noirq:   Quirk flag to allow the client user of this sub-mailbox
-                        to send messages without triggering a Tx ready interrupt,
-                        and to control the Tx ticker. Should be used only on
-                        sub-mailboxes used to communicate with WkupM3 remote
-                        processor on AM33xx/AM43xx SoCs.
-
-Mailbox Users:
-==============
-A device needing to communicate with a target processor device should specify
-them using the common mailbox binding properties, "mboxes" and the optional
-"mbox-names" (please see Documentation/devicetree/bindings/mailbox/mailbox.txt
-for details). Each value of the mboxes property should contain a phandle to the
-mailbox controller device node and an args specifier that will be the phandle to
-the intended sub-mailbox child node to be used for communication. The equivalent
-"mbox-names" property value can be used to give a name to the communication channel
-to be used by the client user.
-
-
-Example:
---------
-
-1. /* OMAP4 */
-mailbox: mailbox@4a0f4000 {
-	compatible = "ti,omap4-mailbox";
-	reg = <0x4a0f4000 0x200>;
-	interrupts = <GIC_SPI 26 IRQ_TYPE_LEVEL_HIGH>;
-	ti,hwmods = "mailbox";
-	#mbox-cells = <1>;
-	ti,mbox-num-users = <3>;
-	ti,mbox-num-fifos = <8>;
-	mbox_ipu: mbox_ipu {
-		ti,mbox-tx = <0 0 0>;
-		ti,mbox-rx = <1 0 0>;
-	};
-	mbox_dsp: mbox_dsp {
-		ti,mbox-tx = <3 0 0>;
-		ti,mbox-rx = <2 0 0>;
-	};
-};
-
-dsp {
-	...
-	mboxes = <&mailbox &mbox_dsp>;
-	...
-};
-
-2. /* AM33xx */
-mailbox: mailbox@480c8000 {
-	compatible = "ti,omap4-mailbox";
-	reg = <0x480C8000 0x200>;
-	interrupts = <77>;
-	ti,hwmods = "mailbox";
-	#mbox-cells = <1>;
-	ti,mbox-num-users = <4>;
-	ti,mbox-num-fifos = <8>;
-	mbox_wkupm3: wkup_m3 {
-		ti,mbox-tx = <0 0 0>;
-		ti,mbox-rx = <0 0 3>;
-	};
-};
-
-3. /* AM65x */
-&cbass_main {
-	cbass_main_navss: interconnect0 {
-		mailbox0_cluster0: mailbox@31f80000 {
-			compatible = "ti,am654-mailbox";
-			reg = <0x00 0x31f80000 0x00 0x200>;
-			#mbox-cells = <1>;
-			ti,mbox-num-users = <4>;
-			ti,mbox-num-fifos = <16>;
-			interrupt-parent = <&intr_main_navss>;
-			interrupts = <164 0>;
-
-			mbox_mcu_r5fss0_core0: mbox-mcu-r5fss0-core0 {
-				ti,mbox-tx = <1 0 0>;
-				ti,mbox-rx = <0 0 0>;
-			};
-		};
-	};
-};
diff --git a/Documentation/devicetree/bindings/mailbox/ti,omap-mailbox.yaml b/Documentation/devicetree/bindings/mailbox/ti,omap-mailbox.yaml
new file mode 100644
index 000000000000..e864d798168d
--- /dev/null
+++ b/Documentation/devicetree/bindings/mailbox/ti,omap-mailbox.yaml
@@ -0,0 +1,308 @@
+# SPDX-License-Identifier: (GPL-2.0-only or BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/mailbox/ti,omap-mailbox.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: TI OMAP2+ and K3 Mailbox devices
+
+maintainers:
+  - Suman Anna <s-anna@ti.com>
+
+description: |
+  The OMAP Mailbox hardware facilitates communication between different
+  processors using a queued mailbox interrupt mechanism. The IP block is
+  external to the various processor subsystems and is connected on an
+  interconnect bus. The communication is achieved through a set of registers
+  for message storage and interrupt configuration registers.
+
+  Each mailbox IP block/cluster has a certain number of h/w fifo queues and
+  output interrupt lines. An output interrupt line is routed to an interrupt
+  controller within a processor subsystem, and there can be more than one line
+  going to a specific processor's interrupt controller. The interrupt line
+  connections are fixed for an instance and are dictated by the IP integration
+  into the SoC (excluding the SoCs that have an Interrupt Crossbar or an
+  Interrupt Router IP). Each interrupt line is programmable through a set of
+  interrupt configuration registers, and have a rx and tx interrupt source per
+  h/w fifo. Communication between different processors is achieved through the
+  appropriate programming of the rx and tx interrupt sources on the appropriate
+  interrupt lines.
+
+  The number of h/w fifo queues and interrupt lines dictate the usable
+  registers. All the current OMAP SoCs except for the newest DRA7xx SoC has a
+  single IP instance. DRA7xx has multiple instances with different number of
+  h/w fifo queues and interrupt lines between different instances. The interrupt
+  lines can also be routed to different processor sub-systems on DRA7xx as they
+  are routed through the Crossbar, a kind of interrupt router/multiplexer. The
+  K3 AM65x, J721E and J7200 SoCs has each of these instances form a cluster and
+  combine multiple clusters into a single IP block present within the Main
+  NavSS. The interrupt lines from all these clusters are multiplexed and routed
+  to different processor subsystems over a limited number of common interrupt
+  output lines of an Interrupt Router. The AM64x SoCS also uses a single IP
+  block comprising of multiple clusters, but the number of clusters are
+  smaller, and the interrupt output lines are connected directly to various
+  processors.
+
+  Mailbox Controller Nodes
+  =========================
+  A Mailbox device node is used to represent a Mailbox IP instance/cluster
+  within a SoC. The sub-mailboxes (actual communication channels) are
+  represented as child nodes of this parent node.
+
+  Mailbox Users
+  ==============
+  A device needing to communicate with a target processor device should specify
+  them using the common mailbox binding properties, "mboxes" and the optional
+  "mbox-names" (please see Documentation/devicetree/bindings/mailbox/mailbox.txt
+  for details). Each value of the mboxes property should contain a phandle to
+  the mailbox controller device node and an args specifier that will be the
+  phandle to the intended sub-mailbox child node to be used for communication.
+  The equivalent "mbox-names" property value can be used to give a name to the
+  communication channel to be used by the client user.
+
+$defs:
+  omap-mbox-descriptor:
+    $ref: /schemas/types.yaml#/definitions/uint32-array
+    description:
+      The omap-mbox-descriptor is made of up of 3 cells and represents a single
+      uni-directional communication channel. A typical sub-mailbox device uses
+      two such channels - one for transmitting (Tx) and one for receiving (Rx).
+    items:
+      - description:
+          mailbox fifo id used either for transmitting on ti,mbox-tx channel or
+          for receiving on ti,mbox-rx channel (fifo_id). This is the hardware
+          fifo number within a mailbox cluster.
+      - description:
+          irq identifier index number to use from the parent's interrupts data.
+          Should be 0 for most of the cases, a positive index value is seen only
+          on mailboxes that have multiple interrupt lines connected to the MPU
+          processor (irq_id). This is an index number in the listed interrupts
+          property in the DT nodes.
+      - description:
+          mailbox user id for identifying the interrupt line associated with
+          generating a tx/rx fifo interrupt (usr_id). This is the hardware
+          user id number within a mailbox cluster.
+
+  omap-sub-mailbox:
+    type: object
+    description:
+      The omap-sub-mailbox is a child node within a Mailbox controller device
+      node and represents the actual communication channel used to send and
+      receive messages between the host processor and a remote processor. Each
+      child node should have a unique node name across all the different mailbox
+      device nodes.
+
+    properties:
+      ti,mbox-tx:
+        $ref: "#/$defs/omap-mbox-descriptor"
+        description: sub-mailbox descriptor property defining a Tx fifo.
+
+      ti,mbox-rx:
+        $ref: "#/$defs/omap-mbox-descriptor"
+        description: sub-mailbox descriptor property defining a Rx fifo.
+
+      ti,mbox-send-noirq:
+        type: boolean
+        description:
+          Quirk flag to allow the client user of this sub-mailbox to send
+          messages without triggering a Tx ready interrupt, and to control
+          the Tx ticker. Should be used only on sub-mailboxes used to
+          communicate with WkupM3 remote processor on AM33xx/AM43xx SoCs.
+
+    required:
+      - ti,mbox-tx
+      - ti,mbox-rx
+
+properties:
+  compatible:
+    enum:
+      - ti,omap2-mailbox # for OMAP2420, OMAP2430 SoCs
+      - ti,omap3-mailbox # for OMAP3430, OMAP3630 SoCs
+      - ti,omap4-mailbox # for OMAP44xx, OMAP54xx, AM33xx, AM43xx and DRA7xx SoCs
+      - ti,am654-mailbox # for K3 AM65x, J721E and J7200 SoCs
+      - ti,am64-mailbox  # for K3 AM64x SoCs
+
+  reg:
+    maxItems: 1
+
+  interrupts:
+    description:
+      Contains the interrupt information for the mailbox device. The format is
+      dependent on which interrupt controller the Mailbox device uses. The
+      number of interrupts listed will at most be the value specified in
+      ti,mbox-num-users property, but is usually limited by the number of
+      interrupts reaching the main processor. An interrupt-parent property
+      is required on SoCs where the interrupt lines are connected through a
+      Interrupt Router before reaching the main processor's GIC.
+
+  "#mbox-cells":
+    const: 1
+    description:
+      The specifier is a phandle to an omap-sub-mailbox device.
+
+  ti,mbox-num-users:
+    $ref: /schemas/types.yaml#/definitions/uint32
+    description:
+      Number of targets (processor devices) that the mailbox device can
+      interrupt.
+
+  ti,mbox-num-fifos:
+    $ref: /schemas/types.yaml#/definitions/uint32
+    description: Number of h/w fifo queues within the mailbox IP block.
+
+  ti,hwmods:
+    $ref: /schemas/types.yaml#/definitions/string
+    deprecated: true
+    description:
+      Name of the hwmod associated with the mailbox. This should be defined
+      in the mailbox node only if the node is not defined as a child node of
+      a corresponding sysc interconnect node.
+
+      This property is only needed on some legacy OMAP SoCs which have not
+      yet been converted to the ti,sysc interconnect hierarachy, but is
+      otherwise considered obsolete.
+
+patternProperties:
+  "^mbox-[a-z0-9-]+$":
+    $ref: "#/$defs/omap-sub-mailbox"
+
+required:
+  - compatible
+  - reg
+  - interrupts
+  - "#mbox-cells"
+  - ti,mbox-num-users
+  - ti,mbox-num-fifos
+
+allOf:
+  - if:
+      properties:
+        compatible:
+          enum:
+            - ti,am654-mailbox
+    then:
+      required:
+        - interrupt-parent
+
+  - if:
+      properties:
+        compatible:
+          enum:
+            - ti,am654-mailbox
+            - ti,am64-mailbox
+    then:
+      properties:
+        ti,mbox-num-users:
+          const: 4
+        ti,mbox-num-fifos:
+          const: 16
+        interrupts:
+          minItems: 1
+          maxItems: 4
+
+  - if:
+      properties:
+        compatible:
+          enum:
+            - ti,omap4-mailbox
+    then:
+      properties:
+        ti,mbox-num-users:
+          enum: [3, 4]
+        ti,mbox-num-fifos:
+          enum: [8, 12]
+        interrupts:
+          minItems: 1
+          maxItems: 4
+
+  - if:
+      properties:
+        compatible:
+          enum:
+            - ti,omap3-mailbox
+    then:
+      properties:
+        ti,mbox-num-users:
+          const: 2
+        ti,mbox-num-fifos:
+          const: 2
+        interrupts:
+          minItems: 1
+          maxItems: 1
+
+  - if:
+      properties:
+        compatible:
+          enum:
+            - ti,omap2-mailbox
+    then:
+      properties:
+        ti,mbox-num-users:
+          const: 4
+        ti,mbox-num-fifos:
+          const: 6
+        interrupts:
+          minItems: 1
+          maxItems: 2
+
+additionalProperties: false
+
+examples:
+  - |
+    /* OMAP4 */
+    #include <dt-bindings/interrupt-controller/arm-gic.h>
+    mailbox: mailbox@4a0f4000 {
+        compatible = "ti,omap4-mailbox";
+        reg = <0x4a0f4000 0x200>;
+        interrupts = <GIC_SPI 26 IRQ_TYPE_LEVEL_HIGH>;
+        #mbox-cells = <1>;
+        ti,mbox-num-users = <3>;
+        ti,mbox-num-fifos = <8>;
+
+        mbox_ipu: mbox-ipu {
+            ti,mbox-tx = <0 0 0>;
+            ti,mbox-rx = <1 0 0>;
+        };
+        mbox_dsp: mbox-dsp {
+            ti,mbox-tx = <3 0 0>;
+            ti,mbox-rx = <2 0 0>;
+        };
+    };
+
+    dsp {
+        mboxes = <&mailbox &mbox_dsp>;
+    };
+
+  - |
+    /* AM33xx */
+    mailbox1: mailbox@480c8000 {
+        compatible = "ti,omap4-mailbox";
+        reg = <0x480c8000 0x200>;
+        interrupts = <77>;
+        #mbox-cells = <1>;
+        ti,mbox-num-users = <4>;
+        ti,mbox-num-fifos = <8>;
+
+        mbox_wkupm3: mbox-wkup-m3 {
+            ti,mbox-tx = <0 0 0>;
+            ti,mbox-rx = <0 0 3>;
+            ti,mbox-send-noirq;
+        };
+    };
+
+  - |
+    /* AM65x */
+    mailbox0_cluster0: mailbox@31f80000 {
+        compatible = "ti,am654-mailbox";
+        reg = <0x31f80000 0x200>;
+        #mbox-cells = <1>;
+        ti,mbox-num-users = <4>;
+        ti,mbox-num-fifos = <16>;
+        interrupt-parent = <&intr_main_navss>;
+        interrupts = <436>;
+
+        mbox_mcu_r5fss0_core0: mbox-mcu-r5fss0-core0 {
+            ti,mbox-tx = <1 0 0>;
+            ti,mbox-rx = <0 0 0>;
+        };
+    };
