[PATCH 3/7] dt-bindings: misc: Add binding for R-Car DAB

[Fabrizio Castro <fabrizio.castro.jz@renesas.com>]

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>
---
 .../devicetree/bindings/misc/renesas,dab.yaml | 75 +++++++++++++++++++
 1 file changed, 75 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/misc/renesas,dab.yaml

diff --git a/Documentation/devicetree/bindings/misc/renesas,dab.yaml b/Documentation/devicetree/bindings/misc/renesas,dab.yaml
new file mode 100644
index 000000000000..e9494add13d7
--- /dev/null
+++ b/Documentation/devicetree/bindings/misc/renesas,dab.yaml
@@ -0,0 +1,75 @@
+# 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
+      - const: renesas,rcar-gen3-dab # Generic fallback for R-Car Gen3 devices
+
+  reg:
+    maxItems: 1
+
+  interrupts:
+    maxItems: 1
+
+  clocks:
+    maxItems: 1
+
+  clock-names:
+    const: dab
+
+  power-domains:
+    maxItems: 1
+
+  resets:
+    maxItems: 1
+
+required:
+  - compatible
+  - reg
+  - interrupts
+  - clocks
+  - clock-names
+  - power-domains
+  - resets
+
+additionalProperties: false
+
+examples:
+  # R8A77990 (R-Car E3)
+  - |
+    #include <dt-bindings/clock/r8a77990-cpg-mssr.h>
+    #include <dt-bindings/interrupt-controller/arm-gic.h>
+    #include <dt-bindings/power/r8a77990-sysc.h>
+
+    dab: dab@e6730000 {
+        compatible = "renesas,dab-r8a77990",
+                     "renesas,rcar-gen3-dab";
+        reg = <0xe6730000 0x120>;
+        interrupts = <GIC_SPI 160 IRQ_TYPE_LEVEL_HIGH>;
+        clocks = <&cpg CPG_MOD 1016>;
+        clock-names = "dab";
+        power-domains = <&sysc R8A77990_PD_ALWAYS_ON>;
+        resets = <&cpg 1016>;
+        status = "disabled";
+    };
-- 
2.25.1