Document bindings for R-Car DAB hardware accelerator, currently
found on the r8a77990 SoC (a.k.a. R-Car E3) and on the r8a77965
SoC (a.k.a. R-Car M3-N).

Signed-off-by: Fabrizio Castro <fabrizio.castro.jz@renesas.com>
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  .../devicetree/bindings/misc/renesas,dab.yaml | 75 +++++++++++++++++++
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diff --git a/Documentation/devicetree/bindings/misc/renesas,dab.yaml b/Documentation/devicetree/bindings/misc/renesas,dab.yaml
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+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+# Copyright (C) 2021 Renesas Electronics Corporation
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/misc/renesas,dab.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Renesas R-Car DAB Hardware Accelerator
+
+maintainers:
+  - Fabrizio Castro <fabrizio.castro.jz@renesas.com>
+
+description:
+  The DAB hardware accelerator found on some R-Car devices is a hardware
+  accelerator for software DAB demodulators.
+  It consists of one FFT (Fast Fourier Transform) module and one decoder module,
+  compatible with DAB specification (ETSI EN 300 401 and ETSI TS 102 563).
+  The decoder module can perform FIC decoding and MSC decoding processing from
+  de-puncture to final decoded result.
+
+properties:
+  compatible:
+    items:
+      - enum:
+          - renesas,dab-r8a77965     # R-Car M3-N
+          - renesas,dab-r8a77990     # R-Car E3