From 42cf20980cded7e0ecdd6dba74592d059c6a8bda Mon Sep 17 00:00:00 2001 From: Padmavathi Venna Date: Thu, 14 Feb 2013 09:10:08 +0530 Subject: 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 Acked-by: Arnd Bergmann Signed-off-by: Vinod Koul --- Documentation/devicetree/bindings/dma/arm-pl330.txt | 21 ++++++++++++++++----- 1 file changed, 16 insertions(+), 5 deletions(-) (limited to 'Documentation') 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 -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"; -- cgit v1.2.3