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authorPadmavathi Venna <padma.v@samsung.com>2013-02-14 09:10:08 +0530
committerVinod Koul <vinod.koul@intel.com>2013-02-14 20:04:27 +0530
commit42cf20980cded7e0ecdd6dba74592d059c6a8bda (patch)
treee300eb889bcbb9aac1aa8c052016bfb4cc406569 /Documentation/devicetree
parent421da89aadd1b24f4a3bc1d60c9de9825ec2debc (diff)
downloadblackbird-op-linux-42cf20980cded7e0ecdd6dba74592d059c6a8bda.tar.gz
blackbird-op-linux-42cf20980cded7e0ecdd6dba74592d059c6a8bda.zip
ARM: dts: pl330: Add #dma-cells for generic dma binding support
This patch adds #dma-cells property to PL330 DMA controller nodes for supporting generic dma dt bindings on samsung exynos5250 platform. Signed-off-by: Padmavathi Venna <padma.v@samsung.com> Acked-by: Arnd Bergmann <arnd@arndb.de> Signed-off-by: Vinod Koul <vinod.koul@intel.com>
Diffstat (limited to 'Documentation/devicetree')
-rw-r--r--Documentation/devicetree/bindings/dma/arm-pl330.txt21
1 files changed, 16 insertions, 5 deletions
diff --git a/Documentation/devicetree/bindings/dma/arm-pl330.txt b/Documentation/devicetree/bindings/dma/arm-pl330.txt
index 36e27d54260b..267565894db9 100644
--- a/Documentation/devicetree/bindings/dma/arm-pl330.txt
+++ b/Documentation/devicetree/bindings/dma/arm-pl330.txt
@@ -10,7 +10,11 @@ Required properties:
- interrupts: interrupt number to the cpu.
Optional properties:
-- dma-coherent : Present if dma operations are coherent
+ - dma-coherent : Present if dma operations are coherent
+ - #dma-cells: must be <1>. used to represent the number of integer
+ cells in the dmas property of client device.
+ - dma-channels: contains the total number of DMA channels supported by the DMAC
+ - dma-requests: contains the total number of DMA requests supported by the DMAC
Example:
@@ -18,16 +22,23 @@ Example:
compatible = "arm,pl330", "arm,primecell";
reg = <0x12680000 0x1000>;
interrupts = <99>;
+ #dma-cells = <1>;
+ #dma-channels = <8>;
+ #dma-requests = <32>;
};
Client drivers (device nodes requiring dma transfers from dev-to-mem or
-mem-to-dev) should specify the DMA channel numbers using a two-value pair
+mem-to-dev) should specify the DMA channel numbers and dma channel names
as shown below.
[property name] = <[phandle of the dma controller] [dma request id]>;
+ [property name] = <[dma channel name]>
where 'dma request id' is the dma request number which is connected
- to the client controller. The 'property name' is recommended to be
- of the form <name>-dma-channel.
+ to the client controller. The 'property name' 'dmas' and 'dma-names'
+ as required by the generic dma device tree binding helpers. The dma
+ names correspond 1:1 with the dma request ids in the dmas property.
- Example: tx-dma-channel = <&pdma0 12>;
+ Example: dmas = <&pdma0 12
+ &pdma1 11>;
+ dma-names = "tx", "rx";
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