From 86e673f7c974f7385d2bdfa91360ea4b800a85f8 Mon Sep 17 00:00:00 2001 From: Amelie Delaunay Date: Wed, 22 Apr 2020 12:29:03 +0200 Subject: [PATCH] dt-bindings: dma: add direct mode support through device tree in stm32-dma 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 Link: https://lore.kernel.org/r/20200422102904.1448-2-amelie.delaunay@st.com Signed-off-by: Vinod Koul --- 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 0c0ac11..7198787 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 -- 2.7.4