diff options
| author | Timur Tabi <timur@freescale.com> | 2008-10-10 20:52:31 +0400 |
|---|---|---|
| committer | Kumar Gala <galak@kernel.crashing.org> | 2008-10-13 20:10:00 +0400 |
| commit | b56c2768d28425783f895971854577f412ae486f (patch) | |
| tree | e015bdccf67d759ea637e85934e6288b43808316 /Documentation/powerpc/dts-bindings/fsl/dma.txt | |
| parent | dbe216319f4e4b23a37eeb623c8338fa59ac050e (diff) | |
| download | linux-b56c2768d28425783f895971854577f412ae486f.tar.xz | |
powerpc: document the "fsl,ssi-dma-channel" compatible property
The "fsl,ssi-dma-channel" compatible property is used to specify a DMA channel
on the Freescale Elo DMA controller that should be used exclusively by the
Freescale SSI audio controller. When a property is marked as such, the Elo
DMA driver will ignore it, and so it will be available for the sound drivers.
Signed-off-by: Timur Tabi <timur@freescale.com>
Signed-off-by: Kumar Gala <galak@kernel.crashing.org>
Diffstat (limited to 'Documentation/powerpc/dts-bindings/fsl/dma.txt')
| -rw-r--r-- | Documentation/powerpc/dts-bindings/fsl/dma.txt | 13 |
1 files changed, 11 insertions, 2 deletions
diff --git a/Documentation/powerpc/dts-bindings/fsl/dma.txt b/Documentation/powerpc/dts-bindings/fsl/dma.txt index 86826df00e64..cc453110fc46 100644 --- a/Documentation/powerpc/dts-bindings/fsl/dma.txt +++ b/Documentation/powerpc/dts-bindings/fsl/dma.txt @@ -20,7 +20,7 @@ Required properties: - compatible : compatible list, contains 2 entries, first is "fsl,CHIP-dma-channel", where CHIP is the processor (mpc8349, mpc8350, etc.) and the second is - "fsl,elo-dma-channel" + "fsl,elo-dma-channel". However, see note below. - reg : <registers mapping for channel> - cell-index : dma channel index starts at 0. @@ -82,7 +82,7 @@ Required properties: - compatible : compatible list, contains 2 entries, first is "fsl,CHIP-dma-channel", where CHIP is the processor (mpc8540, mpc8560, etc.) and the second is - "fsl,eloplus-dma-channel" + "fsl,eloplus-dma-channel". However, see note below. - cell-index : dma channel index starts at 0. - reg : <registers mapping for channel> - interrupts : <interrupt mapping for DMA channel IRQ> @@ -125,3 +125,12 @@ Example: interrupts = <17 2>; }; }; + +Note on DMA channel compatible properties: The compatible property must say +"fsl,elo-dma-channel" or "fsl,eloplus-dma-channel" to be used by the Elo DMA +driver (fsldma). Any DMA channel used by fsldma cannot be used by another +DMA driver, such as the SSI sound drivers for the MPC8610. Therefore, any DMA +channel that should be used for another driver should not use +"fsl,elo-dma-channel" or "fsl,eloplus-dma-channel". For the SSI drivers, for +example, the compatible property should be "fsl,ssi-dma-channel". See ssi.txt +for more information. |