[PATCH v7 1/2] dt-bindings: dma: Add Loongson-1 APB DMA

[Keguang Zhang via B4 Relay <devnull+keguang.zhang.gmail.com@kernel.org>]

From: Keguang Zhang <keguang.zhang@gmail.com>

Add devicetree binding document for Loongson-1 APB DMA.

Signed-off-by: Keguang Zhang <keguang.zhang@gmail.com>
---
Changes in v7:
- Change the comptible to 'loongson,ls1*-apbdma' (suggested by Huacai Chen)
- Update the title and description part accordingly
- Rename the file to loongson,ls1b-apbdma.yaml
- Add a compatible string for LS1A
- Delete minItems of 'interrupts'
- Change patterns of 'interrupt-names' to const

Changes in v6:
- Change the compatible to the fallback
- Some minor fixes

Changes in v5:
- A newly added patch
---
 .../bindings/dma/loongson,ls1b-apbdma.yaml         | 65 ++++++++++++++++++++++
 1 file changed, 65 insertions(+)

diff --git a/Documentation/devicetree/bindings/dma/loongson,ls1b-apbdma.yaml b/Documentation/devicetree/bindings/dma/loongson,ls1b-apbdma.yaml
new file mode 100644
index 000000000000..449da9fc2de1
--- /dev/null
+++ b/Documentation/devicetree/bindings/dma/loongson,ls1b-apbdma.yaml
@@ -0,0 +1,65 @@
+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/dma/loongson,ls1b-apbdma.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Loongson-1 APB DMA Controller
+
+maintainers:
+  - Keguang Zhang <keguang.zhang@gmail.com>
+
+description:
+  Loongson-1 APB DMA controller provides 3 independent channels for
+  peripherals such as NAND, audio playback and capture.
+
+properties:
+  compatible:
+    oneOf:
+      - const: loongson,ls1b-apbdma
+      - items:
+          - enum:
+              - loongson,ls1a-apbdma
+              - loongson,ls1c-apbdma
+          - const: loongson,ls1b-apbdma
+
+  reg:
+    maxItems: 1
+
+  interrupts:
+    description: Each channel has a dedicated interrupt line.
+    maxItems: 3
+
+  interrupt-names:
+    items:
+      - const: ch0
+      - const: ch1
+      - const: ch2
+
+  '#dma-cells':
+    const: 1
+
+required:
+  - compatible
+  - reg
+  - interrupts
+  - interrupt-names
+  - '#dma-cells'
+
+additionalProperties: false
+
+examples:
+  - |
+    #include <dt-bindings/interrupt-controller/irq.h>
+    dma-controller@1fd01160 {
+        compatible = "loongson,ls1b-apbdma";
+        reg = <0x1fd01160 0x4>;
+
+        interrupt-parent = <&intc0>;
+        interrupts = <13 IRQ_TYPE_EDGE_RISING>,
+                     <14 IRQ_TYPE_EDGE_RISING>,
+                     <15 IRQ_TYPE_EDGE_RISING>;
+        interrupt-names = "ch0", "ch1", "ch2";
+
+        #dma-cells = <1>;
+    };

-- 
2.40.1