diff --git a/Documentation/devicetree/bindings/hsi/nokia-modem.txt b/Documentation/devicetree/bindings/hsi/nokia-modem.txt
deleted file mode 100644
index 53de1d9d0b95..000000000000
--- a/Documentation/devicetree/bindings/hsi/nokia-modem.txt
+++ /dev/null
@@ -1,59 +0,0 @@
-Nokia modem client bindings
-
-The Nokia modem HSI client follows the common HSI client binding
-and inherits all required properties. The following additional
-properties are needed by the Nokia modem HSI client:
-
-Required properties:
-- compatible:		Should be one of
-      "nokia,n900-modem"
-      "nokia,n950-modem"
-      "nokia,n9-modem"
-- hsi-channel-names:	Should contain the following strings
-      "mcsaab-control"
-      "speech-control"
-      "speech-data"
-      "mcsaab-data"
-- gpios:		Should provide a GPIO handler for each GPIO listed in
-                        gpio-names
-- gpio-names:		Should contain the following strings
-      "cmt_apeslpx" (for n900, n950, n9)
-      "cmt_rst_rq"  (for n900, n950, n9)
-      "cmt_en"      (for n900, n950, n9)
-      "cmt_rst"     (for n900)
-      "cmt_bsi"     (for n900)
-- interrupts:		Should be IRQ handle for modem's reset indication
-
-Example:
-
-&ssi_port {
-	modem: hsi-client {
-		compatible = "nokia,n900-modem";
-
-		pinctrl-names = "default";
-		pinctrl-0 = <&modem_pins>;
-
-		hsi-channel-ids = <0>, <1>, <2>, <3>;
-		hsi-channel-names = "mcsaab-control",
-				    "speech-control",
-				    "speech-data",
-				    "mcsaab-data";
-		hsi-speed-kbps = <55000>;
-		hsi-mode = "frame";
-		hsi-flow = "synchronized";
-		hsi-arb-mode = "round-robin";
-
-		interrupts-extended = <&gpio3 8 IRQ_TYPE_EDGE_FALLING>; /* 72 */
-
-		gpios = <&gpio3  6 GPIO_ACTIVE_HIGH>, /* 70 */
-			<&gpio3  9 GPIO_ACTIVE_HIGH>, /* 73 */
-			<&gpio3 10 GPIO_ACTIVE_HIGH>, /* 74 */
-			<&gpio3 11 GPIO_ACTIVE_HIGH>, /* 75 */
-			<&gpio5 29 GPIO_ACTIVE_HIGH>; /* 157 */
-		gpio-names = "cmt_apeslpx",
-			     "cmt_rst_rq",
-			     "cmt_en",
-			     "cmt_rst",
-			     "cmt_bsi";
-	};
-};
diff --git a/Documentation/devicetree/bindings/hsi/nokia-modem.yaml b/Documentation/devicetree/bindings/hsi/nokia-modem.yaml
new file mode 100644
index 000000000000..c57cbcc7b722
--- /dev/null
+++ b/Documentation/devicetree/bindings/hsi/nokia-modem.yaml
@@ -0,0 +1,101 @@
+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/hsi/nokia-modem.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Nokia modem
+
+maintainers:
+  - Sebastian Reichel <sre@kernel.org>
+
+properties:
+  compatible:
+    enum:
+      - nokia,n900-modem
+      - nokia,n950-modem
+      - nokia,n9-modem
+
+  hsi-channel-names:
+    items:
+      - const: mcsaab-control
+      - const: speech-control
+      - const: speech-data
+      - const: mcsaab-data
+
+  interrupts:
+    items:
+      - description: modem reset indication
+
+  gpios:
+    minItems: 3
+    maxItems: 5
+
+  gpio-names:
+    items:
+      - const: cmt_apeslpx
+      - const: cmt_rst_rq
+      - const: cmt_en
+      - const: cmt_rst
+      - const: cmt_bsi
+    minItems: 3
+
+required:
+  - gpios
+  - gpio-names
+  - interrupts
+
+allOf:
+  - $ref: hsi-client.yaml#
+  - if:
+      properties:
+        compatible:
+          contains:
+            enum:
+              - nokia,n950-modem
+              - nokia,n9-modem
+    then:
+      properties:
+        gpios:
+          maxItems: 3
+        gpio-names:
+          maxItems: 3
+    else:
+      properties:
+        gpios:
+          minItems: 5
+        gpio-names:
+          minItems: 5
+
+unevaluatedProperties: false
+
+examples:
+  - |
+    #include <dt-bindings/gpio/gpio.h>
+    #include <dt-bindings/interrupt-controller/irq.h>
+    hsi-client {
+        compatible = "nokia,n900-modem";
+
+        hsi-channel-ids = <0>, <1>, <2>, <3>;
+        hsi-channel-names = "mcsaab-control",
+                            "speech-control",
+                            "speech-data",
+                            "mcsaab-data";
+        hsi-speed-kbps = <55000>;
+        hsi-mode = "frame";
+        hsi-flow = "synchronized";
+        hsi-arb-mode = "round-robin";
+
+        interrupts-extended = <&gpio3 8 IRQ_TYPE_EDGE_FALLING>;
+
+        gpios = <&gpio3  6 GPIO_ACTIVE_HIGH>,
+                <&gpio3  9 GPIO_ACTIVE_HIGH>,
+                <&gpio3 10 GPIO_ACTIVE_HIGH>,
+                <&gpio3 11 GPIO_ACTIVE_HIGH>,
+                <&gpio5 29 GPIO_ACTIVE_HIGH>;
+        gpio-names = "cmt_apeslpx",
+                     "cmt_rst_rq",
+                     "cmt_en",
+                     "cmt_rst",
+                     "cmt_bsi";
+    };
