dt-bindings: dma: convert bcm2835-dma bindings to YAML

Convert the DT binding document for bcm2835-dma from .txt to YAML.

Signed-off-by: Stefan Wahren <stefan.wahren@i2se.com>
Reviewed-by: Rob Herring <robh@kernel.org>
Link: https://lore.kernel.org/r/20230617133620.53129-3-stefan.wahren@i2se.com
Signed-off-by: Vinod Koul <vkoul@kernel.org>

Author: Stefan Wahren

Documentation/devicetree/bindings/dma/brcm,bcm2835-dma.txt

@@ -0,0 +1,102 @@
+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/dma/brcm,bcm2835-dma.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: BCM2835 DMA controller
+
+maintainers:
+  - Nicolas Saenz Julienne <nsaenz@kernel.org>
+
+description:
+  The BCM2835 DMA controller has 16 channels in total. Only the lower
+  13 channels have an associated IRQ. Some arbitrary channels are used by the
+  VideoCore firmware (1,3,6,7 in the current firmware version). The channels
+  0, 2 and 3 have special functionality and should not be used by the driver.
+
+allOf:
+  - $ref: dma-controller.yaml#
+
+properties:
+  compatible:
+    const: brcm,bcm2835-dma
+
+  reg:
+    maxItems: 1
+
+  interrupts:
+    description:
+      Should contain the DMA interrupts associated to the DMA channels in
+      ascending order.
+    minItems: 1
+    maxItems: 16
+
+  interrupt-names:
+    minItems: 1
+    maxItems: 16
+
+  '#dma-cells':
+    description: The single cell represents the DREQ number.
+    const: 1
+
+  brcm,dma-channel-mask:
+    $ref: /schemas/types.yaml#/definitions/uint32
+    description:
+      Bitmask of available DMA channels in ascending order that are
+      not reserved by firmware and are available to the
+      kernel. i.e. first channel corresponds to LSB.
+
+unevaluatedProperties: false
+
+required:
+  - compatible
+  - reg
+  - interrupts
+  - "#dma-cells"
+  - brcm,dma-channel-mask
+
+examples:
+  - |
+    dma-controller@7e007000 {
+      compatible = "brcm,bcm2835-dma";
+      reg = <0x7e007000 0xf00>;
+      interrupts = <1 16>,
+                   <1 17>,
+                   <1 18>,
+                   <1 19>,
+                   <1 20>,
+                   <1 21>,
+                   <1 22>,
+                   <1 23>,
+                   <1 24>,
+                   <1 25>,
+                   <1 26>,
+                   /* dma channel 11-14 share one irq */
+                   <1 27>,
+                   <1 27>,
+                   <1 27>,
+                   <1 27>,
+                   /* unused shared irq for all channels */
+                   <1 28>;
+      interrupt-names = "dma0",
+                        "dma1",
+                        "dma2",
+                        "dma3",
+                        "dma4",
+                        "dma5",
+                        "dma6",
+                        "dma7",
+                        "dma8",
+                        "dma9",
+                        "dma10",
+                        "dma11",
+                        "dma12",
+                        "dma13",
+                        "dma14",
+                        "dma-shared-all";
+        #dma-cells = <1>;
+        brcm,dma-channel-mask = <0x7f35>;
+    };
+
+...