From e18a9830233e739ae7045700232c53b4cb2e98eb Mon Sep 17 00:00:00 2001 From: Amelie Delaunay Date: Wed, 16 Oct 2024 14:39:56 +0200 Subject: [PATCH] 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: Amelie Delaunay Reviewed-by: Rob Herring (Arm) Link: https://lore.kernel.org/r/20241016-dma3-mp25-updates-v3-4-8311fe6f228d@foss.st.com Signed-off-by: Vinod Koul --- Documentation/devicetree/bindings/dma/stm32/st,stm32-dma3.yaml | 3 +++ 1 file changed, 3 insertions(+) diff --git a/Documentation/devicetree/bindings/dma/stm32/st,stm32-dma3.yaml b/Documentation/devicetree/bindings/dma/stm32/st,stm32-dma3.yaml index 5484848735f8a..36f9fe860eb99 100644 --- a/Documentation/devicetree/bindings/dma/stm32/st,stm32-dma3.yaml +++ b/Documentation/devicetree/bindings/dma/stm32/st,stm32-dma3.yaml @@ -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