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diff --git a/dts/upstream/Bindings/timer/renesas,ostm.yaml b/dts/upstream/Bindings/timer/renesas,ostm.yaml
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+++ b/dts/upstream/Bindings/timer/renesas,ostm.yaml
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+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/timer/renesas,ostm.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Renesas OS Timer (OSTM)
+
+maintainers:
+  - Chris Brandt <chris.brandt@renesas.com>
+  - Geert Uytterhoeven <geert+renesas@glider.be>
+
+description:
+  The OSTM is a multi-channel 32-bit timer/counter with fixed clock source that
+  can operate in either interval count down timer or free-running compare match
+  mode.
+
+  Channels are independent from each other.
+
+properties:
+  compatible:
+    items:
+      - enum:
+          - renesas,r7s72100-ostm  # RZ/A1H
+          - renesas,r7s9210-ostm   # RZ/A2M
+          - renesas,r9a07g043-ostm # RZ/G2UL and RZ/Five
+          - renesas,r9a07g044-ostm # RZ/G2{L,LC}
+          - renesas,r9a07g054-ostm # RZ/V2L
+          - renesas,r9a09g057-ostm # RZ/V2H(P)
+      - const: renesas,ostm        # Generic
+
+  reg:
+    maxItems: 1
+
+  interrupts:
+    maxItems: 1
+
+  clocks:
+    maxItems: 1
+
+  power-domains:
+    maxItems: 1
+
+  resets:
+    maxItems: 1
+
+required:
+  - compatible
+  - reg
+  - interrupts
+  - clocks
+  - power-domains
+
+if:
+  properties:
+    compatible:
+      contains:
+        enum:
+          - renesas,r9a07g043-ostm
+          - renesas,r9a07g044-ostm
+          - renesas,r9a07g054-ostm
+          - renesas,r9a09g057-ostm
+then:
+  required:
+    - resets
+
+additionalProperties: false
+
+examples:
+  - |
+    #include <dt-bindings/clock/r7s72100-clock.h>
+    #include <dt-bindings/interrupt-controller/arm-gic.h>
+    ostm0: timer@fcfec000 {
+            compatible = "renesas,r7s72100-ostm", "renesas,ostm";
+            reg = <0xfcfec000 0x30>;
+            interrupts = <GIC_SPI 102 IRQ_TYPE_EDGE_RISING>;
+            clocks = <&mstp5_clks R7S72100_CLK_OSTM0>;
+            power-domains = <&cpg_clocks>;
+    };