[PATCH 1/2] dt-bindings: dma: Add Apple ADMAC

Martin Povišer
2022-03-30T16:45:28Z

Apple's Audio DMA Controller (ADMAC) is used to fetch and store audio
samples on Apple SoCs from the "Apple Silicon" family.

Signed-off-by: Martin Povišer <povik+lin@cutebit.org>
---
.../devicetree/bindings/dma/apple,admac.yaml | 73 +++++++++++++++++++
1 file changed, 73 insertions(+)
create mode 100644 Documentation/devicetree/bindings/dma/apple,admac.yaml

diff --git a/Documentation/devicetree/bindings/dma/apple,admac.yaml b/Documentation/devicetree/bindings/dma/apple,admac.yaml
new file mode 100644
index 000000000000..34f76a9a2983
--- /dev/null
+++ b/Documentation/devicetree/bindings/dma/apple,admac.yaml
@@ -0,0 +1,73 @@
+# 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: |
+ Apple's Audio DMA Controller (ADMAC) is used to fetch and store
+ audio samples on Apple SoCs from the "Apple Silicon" family.
+
+maintainers:
+ - Martin Povišer <povik+lin@cutebit.org>
+
+allOf:
+ - $ref: "dma-controller.yaml#"
+
+properties:
+ compatible:
+ items:
+ - enum:
+ - apple,t6000-admac
+ - apple,t8103-admac
+ - const: apple,admac
+
+ reg:
+ maxItems: 1
+
+ '#dma-cells':
+ const: 1
+
+ apple,internal-irq-destination:
+ $ref: /schemas/types.yaml#/definitions/uint32
+ description: Index influencing internal routing of the IRQs
+ within the peripheral.
+
+ interrupts:
+ maxItems: 1
+
+required:
+ - compatible
+ - reg
+ - '#dma-cells'
+ - dma-channels
+ - apple,internal-irq-destination
+ - interrupts
+
+additionalProperties: false
+
+examples:
+ - |
+ #include <dt-bindings/interrupt-controller/apple-aic.h>
+ #include <dt-bindings/interrupt-controller/irq.h>
+
+ 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>;
+ apple,internal-irq-destination = <1>;
+ };
--
2.33.0