summaryrefslogtreecommitdiff
path: root/Documentation/devicetree/bindings/dma
diff options
context:
space:
mode:
authorStefan Brüns <stefan.bruens@rwth-aachen.de>2017-09-28 04:49:23 +0300
committerVinod Koul <vinod.koul@intel.com>2017-10-16 10:01:24 +0300
commitd93cc0e7888a7c650a9155ad70e2236d15785c1e (patch)
treef819f65a3b9b33c17d8594249ce4a8da8e4c15e8 /Documentation/devicetree/bindings/dma
parent500fa9e76bbc40c7dbb65c7daccdc8bc49684429 (diff)
downloadlinux-d93cc0e7888a7c650a9155ad70e2236d15785c1e.tar.xz
arm64: allwinner: a64: Add devicetree binding for DMA controller
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@rwth-aachen.de> Acked-by: Rob Herring <robh@kernel.org> Signed-off-by: Vinod Koul <vinod.koul@intel.com>
Diffstat (limited to 'Documentation/devicetree/bindings/dma')
-rw-r--r--Documentation/devicetree/bindings/dma/sun6i-dma.txt26
1 files changed, 26 insertions, 0 deletions
diff --git a/Documentation/devicetree/bindings/dma/sun6i-dma.txt b/Documentation/devicetree/bindings/dma/sun6i-dma.txt
index 98fbe1a5c6dd..9700b1d00fed 100644
--- a/Documentation/devicetree/bindings/dma/sun6i-dma.txt
+++ b/Documentation/devicetree/bindings/dma/sun6i-dma.txt
@@ -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