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

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Date:   Wed, 30 Mar 2022 18:44:57 +0200
From:   Martin Povišer <povik+lin@...ebit.org>
To:     Hector Martin <marcan@...can.st>, Sven Peter <sven@...npeter.dev>,
        Vinod Koul <vkoul@...nel.org>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzk+dt@...nel.org>
Cc:     Alyssa Rosenzweig <alyssa@...enzweig.io>,
        linux-arm-kernel@...ts.infradead.org, dmaengine@...r.kernel.org,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        Mark Kettenis <kettenis@...nbsd.org>,
        Martin Povišer <povik+lin@...ebit.org>
Subject: [PATCH 1/2] dt-bindings: dma: Add Apple ADMAC

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@...ebit.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@...ebit.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@...004000 {
+      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@...200000 {
+      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