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dt-bindings: dma: stm32-dma3: prevent additional transfers

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Some devices require a single transfer. For example, reading FMC ECC status
registers does not support multiple transfers.
Add the possibility to prevent additional transfers, by setting bit 17 of
the 'DMA transfer requirements' bit mask.

Signed-off-by: Amelie Delaunay <amelie.delaunay@foss.st.com>
Reviewed-by: Rob Herring (Arm) <robh@kernel.org>
Link: https://lore.kernel.org/r/20241016-dma3-mp25-updates-v3-4-8311fe6f228d@foss.st.com
Signed-off-by: Vinod Koul <vkoul@kernel.org>
This commit is contained in:
Amelie Delaunay 2024-10-16 14:39:56 +02:00 committed by Vinod Koul
parent cb467c4511
commit e18a983023
1 changed files with 3 additions and 0 deletions
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Documentation/devicetree/bindings/dma/stm32/st,stm32-dma3.yaml
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@ -99,6 +99,9 @@ properties:
-bit 16: Prevent packing/unpacking mode
0x0: pack/unpack enabled when source data width/burst != destination data width/burst
0x1: memory data width/burst forced to peripheral data width/burst to prevent pack/unpack
-bit 17: Prevent additional transfers due to linked-list refactoring
0x0: don't prevent additional transfers for optimal performance
0x1: prevent additional transfer to accommodate user constraints such as single transfer
required:
- compatible