diff --git a/Documentation/devicetree/bindings/arm/atmel-at91.txt b/Documentation/devicetree/bindings/arm/atmel-at91.txt
deleted file mode 100644
index 4bf1b4da7659..000000000000
--- a/Documentation/devicetree/bindings/arm/atmel-at91.txt
+++ /dev/null
@@ -1,72 +0,0 @@
-Atmel AT91 device tree bindings.
-================================
-
-Boards with a SoC of the Atmel AT91 or SMART family shall have the following
-properties:
-
-Required root node properties:
-compatible: must be one of:
- * "atmel,at91rm9200"
-
- * "atmel,at91sam9" for SoCs using an ARM926EJ-S core, shall be extended with
-   the specific SoC family or compatible:
-    o "atmel,at91sam9260"
-    o "atmel,at91sam9261"
-    o "atmel,at91sam9263"
-    o "atmel,at91sam9x5" for the 5 series, shall be extended with the specific
-      SoC compatible:
-       - "atmel,at91sam9g15"
-       - "atmel,at91sam9g25"
-       - "atmel,at91sam9g35"
-       - "atmel,at91sam9x25"
-       - "atmel,at91sam9x35"
-    o "atmel,at91sam9g20"
-    o "atmel,at91sam9g45"
-    o "atmel,at91sam9n12"
-    o "atmel,at91sam9rl"
-    o "atmel,at91sam9xe"
- * "atmel,sama5" for SoCs using a Cortex-A5, shall be extended with the specific
-   SoC family:
-    o "atmel,sama5d2" shall be extended with the specific SoC compatible:
-       - "atmel,sama5d27"
-    o "atmel,sama5d3" shall be extended with the specific SoC compatible:
-       - "atmel,sama5d31"
-       - "atmel,sama5d33"
-       - "atmel,sama5d34"
-       - "atmel,sama5d35"
-       - "atmel,sama5d36"
-    o "atmel,sama5d4" shall be extended with the specific SoC compatible:
-       - "atmel,sama5d41"
-       - "atmel,sama5d42"
-       - "atmel,sama5d43"
-       - "atmel,sama5d44"
-
- * "atmel,samv7" for MCUs using a Cortex-M7, shall be extended with the specific
-   SoC family:
-    o "atmel,sams70" shall be extended with the specific MCU compatible:
-       - "atmel,sams70j19"
-       - "atmel,sams70j20"
-       - "atmel,sams70j21"
-       - "atmel,sams70n19"
-       - "atmel,sams70n20"
-       - "atmel,sams70n21"
-       - "atmel,sams70q19"
-       - "atmel,sams70q20"
-       - "atmel,sams70q21"
-    o "atmel,samv70" shall be extended with the specific MCU compatible:
-       - "atmel,samv70j19"
-       - "atmel,samv70j20"
-       - "atmel,samv70n19"
-       - "atmel,samv70n20"
-       - "atmel,samv70q19"
-       - "atmel,samv70q20"
-    o "atmel,samv71" shall be extended with the specific MCU compatible:
-       - "atmel,samv71j19"
-       - "atmel,samv71j20"
-       - "atmel,samv71j21"
-       - "atmel,samv71n19"
-       - "atmel,samv71n20"
-       - "atmel,samv71n21"
-       - "atmel,samv71q19"
-       - "atmel,samv71q20"
-       - "atmel,samv71q21"
diff --git a/Documentation/devicetree/bindings/arm/atmel-at91.yaml b/Documentation/devicetree/bindings/arm/atmel-at91.yaml
new file mode 100644
index 000000000000..7cc1d6c7af55
--- /dev/null
+++ b/Documentation/devicetree/bindings/arm/atmel-at91.yaml
@@ -0,0 +1,133 @@
+# SPDX-License-Identifier: GPL-2.0
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/arm/atmel-at91.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Atmel AT91 device tree bindings.
+
+maintainers:
+  - Alexandre Belloni <alexandre.belloni@bootlin.com>
+  - Ludovic Desroches <ludovic.desroches@microchip.com>
+
+description: |
+  Boards with a SoC of the Atmel AT91 or SMART family shall have the following
+
+properties:
+  $nodename:
+    const: '/'
+  compatible:
+    oneOf:
+      - items:
+          - const: atmel,at91rm9200
+      - items:
+          - enum:
+              - olimex,sam9-l9260
+          - enum:
+              - atmel,at91sam9260
+              - atmel,at91sam9261
+              - atmel,at91sam9263
+              - atmel,at91sam9g20
+              - atmel,at91sam9g45
+              - atmel,at91sam9n12
+              - atmel,at91sam9rl
+              - atmel,at91sam9xe
+          - const: atmel,at91sam9
+
+      - items:
+          - enum:
+              - atmel,at91sam9g15
+              - atmel,at91sam9g25
+              - atmel,at91sam9g35
+              - atmel,at91sam9x25
+              - atmel,at91sam9x35
+          - const: atmel,at91sam9x5
+          - const: atmel,at91sam9
+
+      - items:
+          - const: atmel,sama5d27
+          - const: atmel,sama5d2
+          - const: atmel,sama5
+
+      - description: Nattis v2 board with Natte v2 power board
+        items:
+          - const: axentia,nattis-2
+          - const: axentia,natte-2
+          - const: axentia,linea
+          - const: atmel,sama5d31
+          - const: atmel,sama5d3
+          - const: atmel,sama5
+
+      - description: TSE-850 v3 board
+        items:
+          - const: axentia,tse850v3
+          - const: axentia,linea
+          - const: atmel,sama5d31
+          - const: atmel,sama5d3
+          - const: atmel,sama5
+
+      - items:
+          - const: axentia,linea
+          - const: atmel,sama5d31
+          - const: atmel,sama5d3
+          - const: atmel,sama5
+
+      - items:
+          - enum:
+              - atmel,sama5d31
+              - atmel,sama5d33
+              - atmel,sama5d34
+              - atmel,sama5d35
+              - atmel,sama5d36
+          - const: atmel,sama5d3
+          - const: atmel,sama5
+
+      - items:
+          - enum:
+              - atmel,sama5d41
+              - atmel,sama5d42
+              - atmel,sama5d43
+              - atmel,sama5d44
+          - const: atmel,sama5d4
+          - const: atmel,sama5
+
+      - items:
+          - enum:
+              - atmel,sams70j19
+              - atmel,sams70j20
+              - atmel,sams70j21
+              - atmel,sams70n19
+              - atmel,sams70n20
+              - atmel,sams70n21
+              - atmel,sams70q19
+              - atmel,sams70q20
+              - atmel,sams70q21
+          - const: atmel,sams70
+          - const: atmel,samv7
+
+      - items:
+          - enum:
+              - atmel,samv70j19
+              - atmel,samv70j20
+              - atmel,samv70n19
+              - atmel,samv70n20
+              - atmel,samv70q19
+              - atmel,samv70q20
+          - const: atmel,samv70
+          - const: atmel,samv7
+
+      - items:
+          - enum:
+              - atmel,samv71j19
+              - atmel,samv71j20
+              - atmel,samv71j21
+              - atmel,samv71n19
+              - atmel,samv71n20
+              - atmel,samv71n21
+              - atmel,samv71q19
+              - atmel,samv71q20
+              - atmel,samv71q21
+          - const: atmel,samv71
+          - const: atmel,samv7
+
+...
