[PATCH net-next v6 1/3] dt-bindings: ptp: renesas,rcar-gen4-gptp: Add R-Car Gen4

Add bindings for the R-Car Gen4 gPTP timer. The timer enables accurate
synchronization of the clock in the control system. The timer is
system-wide and used by different Ethernet devices on each Gen4 platform.

  - On R-Car S4 it is shared between RSWITCH and RAVB.

  - On R-Car V4H it is shared between RTSN and RAVB.

  - On R-Car V4M it is only used by RAVB.

Signed-off-by: Niklas Söderlund <[email protected]>
Reviewed-by: Krzysztof Kozlowski <[email protected]>
---
* Changes since v1
- Drop 'binding for' for patch subject.
- Drop comment for renesas,rcar-gen4-gptp compatible to match other
  Renesas bindings.
- Drop unused label in example.
- Rename node ptp in example.
---
 .../bindings/ptp/renesas,rcar-gen4-gptp.yaml  | 64 +++++++++++++++++++
 MAINTAINERS                                   |  6 ++
 2 files changed, 70 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/ptp/renesas,rcar-gen4-gptp.yaml

diff --git a/Documentation/devicetree/bindings/ptp/renesas,rcar-gen4-gptp.yaml b/Documentation/devicetree/bindings/ptp/renesas,rcar-gen4-gptp.yaml
new file mode 100644
index 000000000000..3edd64d40038
--- /dev/null
+++ b/Documentation/devicetree/bindings/ptp/renesas,rcar-gen4-gptp.yaml
@@ -0,0 +1,64 @@
+# SPDX-License-Identifier: GPL-2.0-only OR BSD-2-Clause
+# Copyright (C) 2026 Renesas Electronics Corp.
+# Copyright (C) 2026 Niklas Söderlund <[email protected]>
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/ptp/renesas,rcar-gen4-gptp.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Renesas R-Car Gen4 gPTP timer
+
+maintainers:
+  - Niklas Söderlund <[email protected]>
+
+description:
+  The R-Car Gen4 gPTP timer enables accurate synchronization of the clock in
+  the control system. The timer is system-wide and used by different Ethernet
+  devices on each Gen4 platform.
+
+    - On R-Car S4 it is shared between RSWITCH and RAVB.
+    - On R-Car V4H it is shared between RTSN and RAVB.
+    - On R-Car V4M it is only used by RAVB.
+
+properties:
+  compatible:
+    items:
+      - enum:
+          - renesas,r8a779f0-gptp # S4-8
+          - renesas,r8a779g0-gptp # V4H
+          - renesas,r8a779h0-gptp # V4M
+      - const: renesas,rcar-gen4-gptp
+
+  reg:
+    maxItems: 1
+
+  clocks:
+    maxItems: 1
+
+  power-domains:
+    maxItems: 1
+
+  resets:
+    maxItems: 1
+
+required:
+  - compatible
+  - reg
+  - clocks
+  - power-domains
+  - resets
+
+additionalProperties: false
+
+examples:
+  - |
+    #include <dt-bindings/clock/r8a779g0-cpg-mssr.h>
+    #include <dt-bindings/power/r8a779g0-sysc.h>
+
+    ptp@e6449000 {
+            compatible = "renesas,r8a779g0-gptp", "renesas,rcar-gen4-gptp";
+            reg = <0xe6449000 0x500>;
+            clocks = <&cpg CPG_MOD 2723>;
+            power-domains = <&sysc R8A779G0_PD_ALWAYS_ON>;
+            resets = <&cpg 2723>;
+    };
diff --git a/MAINTAINERS b/MAINTAINERS
index 932ea1db048e..ba83c5792c8c 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -22941,6 +22941,12 @@ S:	Maintained
 F:	Documentation/devicetree/bindings/mtd/renesas-nandc.yaml
 F:	drivers/mtd/nand/raw/renesas-nand-controller.c
 
+RENESAS R-CAR GEN4 GPTP DRIVER
+M:	Niklas Söderlund <[email protected]>
+L:	[email protected]
+S:	Supported
+F:	Documentation/devicetree/bindings/ptp/renesas,rcar-gen4-gptp.yaml
+
 RENESAS R-CAR GYROADC DRIVER
 M:	Marek Vasut <[email protected]>
 L:	[email protected]
-- 
2.55.0