[PATCH v2 06/16] dt-bindings: timer: add Canaan k210 to Synopsys DesignWare timer

[Conor Dooley <mail@conchuod.ie>]

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

The Canaan k210 apparently has a Sysnopsys Designware timer but
according to the documentation & devicetree it has 2 interrupts rather
than the standard one. Add a custom compatible that supports the 2
interrupt configuration and 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/timer/snps,dw-apb-timer.yaml     | 28 +++++++++++++++----
 1 file changed, 22 insertions(+), 6 deletions(-)

diff --git a/Documentation/devicetree/bindings/timer/snps,dw-apb-timer.yaml b/Documentation/devicetree/bindings/timer/snps,dw-apb-timer.yaml
index d33c9205a909..9a76acc7a66f 100644
--- a/Documentation/devicetree/bindings/timer/snps,dw-apb-timer.yaml
+++ b/Documentation/devicetree/bindings/timer/snps,dw-apb-timer.yaml
@@ -12,6 +12,9 @@ maintainers:
 properties:
   compatible:
     oneOf:
+      - items:
+          - const: canaan,k210-apb-timer
+          - const: snps,dw-apb-timer
       - const: snps,dw-apb-timer
       - enum:
           - snps,dw-apb-timer-sp
@@ -21,9 +24,6 @@ properties:
   reg:
     maxItems: 1
 
-  interrupts:
-    maxItems: 1
-
   resets:
     maxItems: 1
 
@@ -41,7 +41,23 @@ properties:
 
   clock-frequency: true
 
-additionalProperties: false
+unevaluatedProperties: false
+
+if:
+  properties:
+    compatible:
+      contains:
+        const: canaan,k210-apb-timer
+
+then:
+  properties:
+    interrupts:
+      maxItems: 2
+
+else:
+  properties:
+    interrupts:
+      maxItems: 1
 
 required:
   - compatible
@@ -60,8 +76,8 @@ oneOf:
 examples:
   - |
     timer@ffe00000 {
-      compatible = "snps,dw-apb-timer";
-      interrupts = <0 170 4>;
+      compatible = "canaan,k210-apb-timer", "snps,dw-apb-timer";
+      interrupts = <0 170 4>, <0 170 4>;
       reg = <0xffe00000 0x1000>;
       clocks = <&timer_clk>, <&timer_pclk>;
       clock-names = "timer", "pclk";
-- 
2.36.1