diff mbox series

[1/2] dt-bindings: dma: add direct mode support through device tree in stm32-dma

Message ID 20200422102904.1448-2-amelie.delaunay@st.com (mailing list archive)
State Mainlined
Commit 86e673f7c974f7385d2bdfa91360ea4b800a85f8
Headers show
Series STM32 DMA Direct mode | expand

Commit Message

Amelie Delaunay April 22, 2020, 10:29 a.m. UTC 
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>
---
 Documentation/devicetree/bindings/dma/st,stm32-dma.yaml | 5 +++++
 1 file changed, 5 insertions(+)
diff mbox series

Patch

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@st.com>