[PATCH v28 2/4] dt-bindings: i2c: ast2600-i2c.yaml: Add global-regs and enable-dma properties

Add aspeed,enable-dma boolean property to indicate that DMA is
available for transfers on this I2C bus.

Also add the aspeed,global-regs phandle to reference the AST2600
global registers syscon node, containing the SoC-common I2C register
set.

These properties apply only to the AST2600 binding. Legacy DTs remain
unchanged.

Signed-off-by: Ryan Chen <[email protected]>
---
Changes in v28:
- update commit message correspond with aspeed,enable-dma.
- remove aspeed,transfer-mode and add aspeed,enable-dma property and
  description.
- Fix aspeed,enable-dma description to reflect hardware capability rather
  than software behavior
Changes in v27:
- change aspeed,transfer-mode to aspeed,enable-dma.
---
 .../devicetree/bindings/i2c/aspeed,ast2600-i2c.yaml          | 12 ++++++++++++
 1 file changed, 12 insertions(+)

diff --git a/Documentation/devicetree/bindings/i2c/aspeed,ast2600-i2c.yaml b/Documentation/devicetree/bindings/i2c/aspeed,ast2600-i2c.yaml
index de2c359037da..67b23d1a4cec 100644
--- a/Documentation/devicetree/bindings/i2c/aspeed,ast2600-i2c.yaml
+++ b/Documentation/devicetree/bindings/i2c/aspeed,ast2600-i2c.yaml
@@ -37,6 +37,16 @@ properties:
   resets:
     maxItems: 1
 
+  aspeed,enable-dma:
+    type: boolean
+    description: Indicates this I2C controller instance has DMA capability.
+
+  aspeed,global-regs:
+    $ref: /schemas/types.yaml#/definitions/phandle
+    description:
+      Phandle reference to the i2c global syscon node, containing the
+      SoC-common i2c register set.
+
 required:
   - reg
   - compatible
@@ -59,4 +69,6 @@ examples:
         resets = <&syscon ASPEED_RESET_I2C>;
         clock-frequency = <100000>;
         interrupts = <GIC_SPI 110 IRQ_TYPE_LEVEL_HIGH>;
+        aspeed,global-regs = <&i2c_global>;
+        aspeed,enable-dma;
     };

-- 
2.34.1