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@xxxxxx>
---
Documentation/devicetree/bindings/dma/st,stm32-dma.yaml | 5 +++++
1 file changed, 5 insertions(+)
diff --git a/Documentation/devicetree/bindings/dma/st,stm32-dma.yaml b/Documentation/devicetree/bindings/dma/st,stm32-dma.yaml
index 0c0ac11ad55f..71987878e4ae 100644
--- a/Documentation/devicetree/bindings/dma/st,stm32-dma.yaml
+++ b/Documentation/devicetree/bindings/dma/st,stm32-dma.yaml
@@ -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@xxxxxx>
--
2.17.1
