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| author |   Kuninori Morimoto <kuninori.morimoto.gx@renesas.com> | 2014-06-22 17:56:23 -0700 |
|---|---|---|
| committer |   Mark Brown <broonie@linaro.org> | 2014-06-28 14:41:19 +0100 |
| commit | d9288d0ba12de1b5efb830b9128e4cc6877318fc (patch) | |
| tree | f02a9aabd4c12c16bb320e18b827270a25b48689 /Documentation/devicetree/bindings/sound/renesas,rsnd.txt | |
| parent | ASoC: fsi: use dmaengine_prep_dma_cyclic() for DMA transfer (diff) | |
| download | linux-dev-d9288d0ba12de1b5efb830b9128e4cc6877318fc.tar.xz linux-dev-d9288d0ba12de1b5efb830b9128e4cc6877318fc.zip | |
ASoC: rsnd: SSI + DMA can select BUSIF
Sound data needs to be sent to R-Car sound SSI when playback.
But, there are 2 interfaces for it.
1st is SSITDR/SSIRDR which are mapped on SSI.
2nd is SSIn_BUSIF which are mapped on SSIU.
2nd SSIn_BUSIF is used when DMA transfer,
and it is always used if sound data came from via SRC.
But, we can use it when SSI+DMA case too.
(Current driver is assuming 1st SSITDR/SSIRDR for it)
2nd SSIn_BUSIF can be used as FIFO.
This is very helpful/useful for SSI+DMA.
But DMA address / DMA ID are not same between 1st/2nd cases.
This patch care about these settings.
Signed-off-by: Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>
Signed-off-by: Mark Brown <broonie@linaro.org>
Diffstat (limited to 'Documentation/devicetree/bindings/sound/renesas,rsnd.txt')
| -rw-r--r-- | Documentation/devicetree/bindings/sound/renesas,rsnd.txt | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/Documentation/devicetree/bindings/sound/renesas,rsnd.txt b/Documentation/devicetree/bindings/sound/renesas,rsnd.txt index 8346cab046cd..41a120c2389d 100644 --- a/Documentation/devicetree/bindings/sound/renesas,rsnd.txt +++ b/Documentation/devicetree/bindings/sound/renesas,rsnd.txt @@ -21,6 +21,7 @@ SSI subnode properties: - interrupts : Should contain SSI interrupt for PIO transfer - shared-pin : if shared clock pin - pio-transfer : use PIO transfer mode +- no-busif : BUSIF is not ussed when [mem -> SSI] via DMA case SRC subnode properties: no properties at this point |