dt-bindings: dma: Add apple,admac binding

The Audio DMA Controller (ADMAC) is used to load and store audio
samples from/to system memory. It is present on Apple SoCs from
the "Apple Silicon" family.

Signed-off-by: Martin Povišer <povik@protonmail.com>

Documentation/devicetree/bindings/dma/apple,admac.yaml

@@ -0,0 +1,62 @@
+# SPDX-License-Identifier: GPL-2.0-only OR BSD-2-Clause
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/dma/apple,admac.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Apple Audio DMA Controller (ADMAC)
+
+description: |
+  The Audio DMA Controller (ADMAC) is used to load and store audio
+  samples from/to system memory. It is present on Apple SoCs
+  from the "Apple Silicon" family.
+
+maintainers:
+  - Martin Povišer <povik@protonmail.com>
+
+allOf:
+  - $ref: "dma-controller.yaml#"
+
+properties:
+  compatible:
+    items:
+      - const: apple,t8103-admac
+      - const: apple,admac
+
+  reg:
+    maxItems: 1
+
+  '#dma-cells':
+    const: 1
+
+  interrupts:
+    maxItems: 1
+
+required:
+  - compatible
+  - reg
+  - interrupts
+  - '#dma-cells'
+  - dma-channels
+
+additionalProperties: false
+
+examples:
+  - |
+    dart_sio: iommu@235004000 {
+      compatible = "apple,t8103-dart", "apple,dart";
+      reg = <0x2 0x35004000 0x0 0x4000>;
+      interrupt-parent = <&aic>;
+      interrupts = <AIC_IRQ 635 IRQ_TYPE_LEVEL_HIGH>;
+      #iommu-cells = <1>;
+    };
+
+    admac: dma-controller@238200000 {
+      compatible = "apple,t8103-admac", "apple,admac";
+      reg = <0x2 0x38200000 0x0 0x34000>;
+      dma-channels = <12>;
+      interrupt-parent = <&aic>;
+      interrupts = <AIC_IRQ 626 IRQ_TYPE_LEVEL_HIGH>;
+      #dma-cells = <1>;
+      iommus = <&dart_sio 2>;
+    };