diff options
| author | Padmavathi Venna <padma.v@samsung.com> | 2013-02-13 22:40:08 -0500 |
|---|---|---|
| committer | Vinod Koul <vinod.koul@intel.com> | 2013-02-14 09:34:27 -0500 |
| commit | 42cf20980cded7e0ecdd6dba74592d059c6a8bda (patch) | |
| tree | e300eb889bcbb9aac1aa8c052016bfb4cc406569 /Documentation | |
| parent | 421da89aadd1b24f4a3bc1d60c9de9825ec2debc (diff) | |
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')
| -rw-r--r-- | Documentation/devicetree/bindings/dma/arm-pl330.txt | 21 |
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: | |||
| 10 | - interrupts: interrupt number to the cpu. | 10 | - interrupts: interrupt number to the cpu. |
| 11 | 11 | ||
| 12 | Optional properties: | 12 | Optional properties: |
| 13 | - dma-coherent : Present if dma operations are coherent | 13 | - dma-coherent : Present if dma operations are coherent |
| 14 | - #dma-cells: must be <1>. used to represent the number of integer | ||
| 15 | cells in the dmas property of client device. | ||
| 16 | - dma-channels: contains the total number of DMA channels supported by the DMAC | ||
| 17 | - dma-requests: contains the total number of DMA requests supported by the DMAC | ||
| 14 | 18 | ||
| 15 | Example: | 19 | Example: |
| 16 | 20 | ||
| @@ -18,16 +22,23 @@ Example: | |||
| 18 | compatible = "arm,pl330", "arm,primecell"; | 22 | compatible = "arm,pl330", "arm,primecell"; |
| 19 | reg = <0x12680000 0x1000>; | 23 | reg = <0x12680000 0x1000>; |
| 20 | interrupts = <99>; | 24 | interrupts = <99>; |
| 25 | #dma-cells = <1>; | ||
| 26 | #dma-channels = <8>; | ||
| 27 | #dma-requests = <32>; | ||
| 21 | }; | 28 | }; |
| 22 | 29 | ||
| 23 | Client drivers (device nodes requiring dma transfers from dev-to-mem or | 30 | Client drivers (device nodes requiring dma transfers from dev-to-mem or |
| 24 | mem-to-dev) should specify the DMA channel numbers using a two-value pair | 31 | mem-to-dev) should specify the DMA channel numbers and dma channel names |
| 25 | as shown below. | 32 | as shown below. |
| 26 | 33 | ||
| 27 | [property name] = <[phandle of the dma controller] [dma request id]>; | 34 | [property name] = <[phandle of the dma controller] [dma request id]>; |
| 35 | [property name] = <[dma channel name]> | ||
| 28 | 36 | ||
| 29 | where 'dma request id' is the dma request number which is connected | 37 | where 'dma request id' is the dma request number which is connected |
| 30 | to the client controller. The 'property name' is recommended to be | 38 | to the client controller. The 'property name' 'dmas' and 'dma-names' |
| 31 | of the form <name>-dma-channel. | 39 | as required by the generic dma device tree binding helpers. The dma |
| 40 | names correspond 1:1 with the dma request ids in the dmas property. | ||
| 32 | 41 | ||
| 33 | Example: tx-dma-channel = <&pdma0 12>; | 42 | Example: dmas = <&pdma0 12 |
| 43 | &pdma1 11>; | ||
| 44 | dma-names = "tx", "rx"; | ||