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dt-bindings: stm32-dma: introduce DMA features bitfield

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This bitfield intends to address features to be activated within the
driver. Initially the mask was only meant for FIFO Threshold management.
Backward compatibility is preserved but the meaning of this field has been
extended to features instead of only threshold.

Signed-off-by: Pierre-Yves MORDRET <pierre-yves.mordret@st.com>
Reviewed-by: Rob Herring <robh@kernel.org>
Signed-off-by: Vinod Koul <vinod.koul@intel.com>
This commit is contained in:
Pierre-Yves MORDRET 2018-03-13 17:42:00 +01:00 committed by Vinod Koul
parent 7928b2cbe5
commit 7c7055c7c5
1 changed files with 3 additions and 3 deletions
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6
Documentation/devicetree/bindings/dma/stm32-dma.txt
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@ -62,14 +62,14 @@ channel: a phandle to the DMA controller plus the following four integer cells:
0x1: medium
0x2: high
0x3: very high
4. A 32bit mask specifying the DMA FIFO threshold configuration which are device
dependent:
-bit 0-1: Fifo threshold
4. A 32bit bitfield value specifying DMA features which are device dependent:
-bit 0-1: DMA FIFO threshold selection
0x0: 1/4 full FIFO
0x1: 1/2 full FIFO
0x2: 3/4 full FIFO
0x3: full FIFO
Example:
usart1: serial@40011000 {