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dt-bindings: dma: add direct mode support through device tree in stm32-dma

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Direct mode or FIFO mode is computed by stm32-dma driver. Add a way for the
user to force direct mode, by setting bit 2 in the bitfield value
specifying DMA features in the device tree.

Signed-off-by: Amelie Delaunay <amelie.delaunay@st.com>
Link: https://lore.kernel.org/r/20200422102904.1448-2-amelie.delaunay@st.com
Signed-off-by: Vinod Koul <vkoul@kernel.org>
This commit is contained in:
Amelie Delaunay 2020-04-22 12:29:03 +02:00 committed by Vinod Koul
parent 920c5974f0
commit 86e673f7c9
1 changed files with 5 additions and 0 deletions
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Documentation/devicetree/bindings/dma/st,stm32-dma.yaml
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@ -36,6 +36,11 @@ description: |
0x1: 1/2 full FIFO
0x2: 3/4 full FIFO
0x3: full FIFO
-bit 2: DMA direct mode
0x0: FIFO mode with threshold selectable with bit 0-1
0x1: Direct mode: each DMA request immediately initiates a transfer
from/to the memory, FIFO is bypassed.
maintainers:
- Amelie Delaunay <amelie.delaunay@st.com>