The A64 is register compatible with the H3, but has a different number
of dma channels and request ports.
Attach additional properties to the node to allow future reuse of the
compatible for controllers with different number of channels/requests.
If dma-requests is not specified, the register layout defined maximum
of 32 is used.
Signed-off-by: Stefan Brüns <stefan.bruens@xxxxxxxxxxxxxx>
Acked-by: Rob Herring <robh@xxxxxxxxxx>
---
Changes in v3:
- Drop leading 0 from unit name in DT example
Changes in v2: None
.../devicetree/bindings/dma/sun6i-dma.txt | 28 +++++++++++++++++++++-
1 file changed, 27 insertions(+), 1 deletion(-)
diff --git a/Documentation/devicetree/bindings/dma/sun6i-dma.txt b/Documentation/devicetree/bindings/dma/sun6i-dma.txt
index 98fbe1a5c6dd..b2df4f0f1488 100644
--- a/Documentation/devicetree/bindings/dma/sun6i-dma.txt
+++ b/Documentation/devicetree/bindings/dma/sun6i-dma.txt
@@ -18,7 +18,7 @@ Required properties:
- #dma-cells : Should be 1, a single cell holding a line request number
Example:
- dma: dma-controller@01c02000 {
+ dma: dma-controller@1c02000 {
compatible = "allwinner,sun6i-a31-dma";
reg = <0x01c02000 0x1000>;
interrupts = <0 50 4>;
@@ -27,6 +27,32 @@ Example:
#dma-cells = <1>;
};
+------------------------------------------------------------------------------
+For A64 DMA controller:
+
+Required properties:
+- compatible: "allwinner,sun50i-a64-dma"
+- dma-channels: Number of DMA channels supported by the controller.
+ Refer to Documentation/devicetree/bindings/dma/dma.txt
+- all properties above, i.e. reg, interrupts, clocks, resets and #dma-cells
+
+Optional properties:
+- dma-requests: Number of DMA request signals supported by the controller.
+ Refer to Documentation/devicetree/bindings/dma/dma.txt
+
+Example:
+ dma: dma-controller@1c02000 {
+ compatible = "allwinner,sun50i-a64-dma";
+ reg = <0x01c02000 0x1000>;
+ interrupts = <GIC_SPI 50 IRQ_TYPE_LEVEL_HIGH>;
+ clocks = <&ccu CLK_BUS_DMA>;
+ dma-channels = <8>;
+ dma-requests = <27>;
+ resets = <&ccu RST_BUS_DMA>;
+ #dma-cells = <1>;
+ };
+------------------------------------------------------------------------------
+
Clients:
DMA clients connected to the A31 DMA controller must use the format
--
2.14.1
--
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