[PATCH v2 05/16] dt-bindings: dma: add Canaan k210 to Synopsys DesignWare DMA

[Conor Dooley <mail@conchuod.ie>]

From: Conor Dooley <conor.dooley@microchip.com>

The Canaan k210 apparently has a Sysnopsys Designware AXI DMA
controller, but according to the documentation & devicetree it has 6
interrupts rather than the standard one. Add a custom compatible that
supports the 6 interrupt configuration which falls back to the standard
binding which is currently the one in use in the devicetree entry.

Link: https://canaan-creative.com/wp-content/uploads/2020/03/kendryte_standalone_programming_guide_20190311144158_en.pdf #Page 58
Signed-off-by: Conor Dooley <conor.dooley@microchip.com>
---
 .../bindings/dma/snps,dw-axi-dmac.yaml        | 35 ++++++++++++++-----
 1 file changed, 26 insertions(+), 9 deletions(-)

diff --git a/Documentation/devicetree/bindings/dma/snps,dw-axi-dmac.yaml b/Documentation/devicetree/bindings/dma/snps,dw-axi-dmac.yaml
index 4324a94b26b2..bc85598151ef 100644
--- a/Documentation/devicetree/bindings/dma/snps,dw-axi-dmac.yaml
+++ b/Documentation/devicetree/bindings/dma/snps,dw-axi-dmac.yaml
@@ -18,9 +18,13 @@ allOf:
 
 properties:
   compatible:
-    enum:
-      - snps,axi-dma-1.01a
-      - intel,kmb-axi-dma
+    oneOf:
+      - items:
+          - const: canaan,k210-axi-dma
+          - const: snps,axi-dma-1.01a
+      - enum:
+          - snps,axi-dma-1.01a
+          - intel,kmb-axi-dma
 
   reg:
     minItems: 1
@@ -33,9 +37,6 @@ properties:
       - const: axidma_ctrl_regs
       - const: axidma_apb_regs
 
-  interrupts:
-    maxItems: 1
-
   clocks:
     items:
       - description: Bus Clock
@@ -92,6 +93,22 @@ properties:
     minimum: 1
     maximum: 256
 
+if:
+  properties:
+    compatible:
+      contains:
+        const: canaan,k210-axi-dma
+
+then:
+  properties:
+    interrupts:
+      maxItems: 6
+
+else:
+  properties:
+    interrupts:
+      maxItems: 1
+
 required:
   - compatible
   - reg
@@ -105,7 +122,7 @@ required:
   - snps,priority
   - snps,block-size
 
-additionalProperties: false
+unevaluatedProperties: false
 
 examples:
   - |
@@ -113,12 +130,12 @@ examples:
      #include <dt-bindings/interrupt-controller/irq.h>
      /* example with snps,dw-axi-dmac */
      dmac: dma-controller@80000 {
-         compatible = "snps,axi-dma-1.01a";
+         compatible = "canaan,k210-axi-dma", "snps,axi-dma-1.01a";
          reg = <0x80000 0x400>;
          clocks = <&core_clk>, <&cfgr_clk>;
          clock-names = "core-clk", "cfgr-clk";
          interrupt-parent = <&intc>;
-         interrupts = <27>;
+         interrupts = <27>, <28>, <29>, <30>, <31>, <32>;
          #dma-cells = <1>;
          dma-channels = <4>;
          snps,dma-masters = <2>;
-- 
2.36.1