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authorGuennadi Liakhovetski <g.liakhovetski@gmx.de>2014-07-19 12:48:45 +0200
committerVinod Koul <vinod.koul@intel.com>2014-08-04 13:27:35 +0530
commit94c7b6fc7cd1b29d987592ce7eecd902f6728db4 (patch)
tree6c98ac2856d11583da758e7bd82ba42853dbe7f0 /Documentation
parented64610f29414c0ea782bb6a462a3be72e7704dd (diff)
downloadop-kernel-dev-94c7b6fc7cd1b29d987592ce7eecd902f6728db4.zip
op-kernel-dev-94c7b6fc7cd1b29d987592ce7eecd902f6728db4.tar.gz
dmaengine: add device tree binding documentation for the nbpfaxi driver
The nbpfaxi dmaengine driver doesn't define any new bindings, it only uses standard dmaengine bindings and defines 3 flags for the 3rd parameter of the "dmas" property. Signed-off-by: Guennadi Liakhovetski <g.liakhovetski+renesas@gmail.com> Acked-by: Arnd Bergmann <arnd@arndb.de> Signed-off-by: Vinod Koul <vinod.koul@intel.com>
Diffstat (limited to 'Documentation')
-rw-r--r--Documentation/devicetree/bindings/dma/nbpfaxi.txt61
1 files changed, 61 insertions, 0 deletions
diff --git a/Documentation/devicetree/bindings/dma/nbpfaxi.txt b/Documentation/devicetree/bindings/dma/nbpfaxi.txt
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+++ b/Documentation/devicetree/bindings/dma/nbpfaxi.txt
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+* Renesas "Type-AXI" NBPFAXI* DMA controllers
+
+* DMA controller
+
+Required properties
+
+- compatible: must be one of
+ "renesas,nbpfaxi64dmac1b4"
+ "renesas,nbpfaxi64dmac1b8"
+ "renesas,nbpfaxi64dmac1b16"
+ "renesas,nbpfaxi64dmac4b4"
+ "renesas,nbpfaxi64dmac4b8"
+ "renesas,nbpfaxi64dmac4b16"
+ "renesas,nbpfaxi64dmac8b4"
+ "renesas,nbpfaxi64dmac8b8"
+ "renesas,nbpfaxi64dmac8b16"
+- #dma-cells: must be 2: the first integer is a terminal number, to which this
+ slave is connected, the second one is flags. Flags is a bitmask
+ with the following bits defined:
+
+#define NBPF_SLAVE_RQ_HIGH 1
+#define NBPF_SLAVE_RQ_LOW 2
+#define NBPF_SLAVE_RQ_LEVEL 4
+
+Optional properties:
+
+You can use dma-channels and dma-requests as described in dma.txt, although they
+won't be used, this information is derived from the compatibility string.
+
+Example:
+
+ dma: dma-controller@48000000 {
+ compatible = "renesas,nbpfaxi64dmac8b4";
+ reg = <0x48000000 0x400>;
+ interrupts = <0 12 0x4
+ 0 13 0x4
+ 0 14 0x4
+ 0 15 0x4
+ 0 16 0x4
+ 0 17 0x4
+ 0 18 0x4
+ 0 19 0x4>;
+ #dma-cells = <2>;
+ dma-channels = <8>;
+ dma-requests = <8>;
+ };
+
+* DMA client
+
+Required properties:
+
+dmas and dma-names are required, as described in dma.txt.
+
+Example:
+
+#include <dt-bindings/dma/nbpfaxi.h>
+
+...
+ dmas = <&dma 0 (NBPF_SLAVE_RQ_HIGH | NBPF_SLAVE_RQ_LEVEL)
+ &dma 1 (NBPF_SLAVE_RQ_HIGH | NBPF_SLAVE_RQ_LEVEL)>;
+ dma-names = "rx", "tx";
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