Commit e18a9830 authored by Amelie Delaunay's avatar Amelie Delaunay Committed by Vinod Koul
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dt-bindings: dma: stm32-dma3: prevent additional transfers 



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: default avatarAmelie Delaunay <amelie.delaunay@foss.st.com>
Reviewed-by: default avatarRob Herring (Arm) <robh@kernel.org>
Link: https://lore.kernel.org/r/20241016-dma3-mp25-updates-v3-4-8311fe6f228d@foss.st.com


Signed-off-by: default avatarVinod Koul <vkoul@kernel.org>
parent cb467c45

Documentation/devicetree/bindings/dma/stm32/st,stm32-dma3.yaml

+3 −0
Original line number Diff line number Diff line
@@ -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