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| author | Pierre-Yves MORDRET <pierre-yves.mordret@st.com> | 2018-03-13 17:42:00 +0100 |
|---|---|---|
| committer | Vinod Koul <vinod.koul@intel.com> | 2018-04-04 11:40:42 +0530 |
| commit | 7c7055c7c5c7a7e66395777b72e6693a81831a54 (patch) | |
| tree | 142f12093da5ac1d0393909ed638e7f79729040b /Documentation/devicetree | |
| parent | 7928b2cbe55b2a410a0f5c1f154610059c57b1b2 (diff) | |
| download | linux-7c7055c7c5c7a7e66395777b72e6693a81831a54.tar.bz2 | |
dt-bindings: stm32-dma: introduce DMA features bitfield
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>
Diffstat (limited to 'Documentation/devicetree')
| -rw-r--r-- | Documentation/devicetree/bindings/dma/stm32-dma.txt | 6 |
1 files changed, 3 insertions, 3 deletions
diff --git a/Documentation/devicetree/bindings/dma/stm32-dma.txt b/Documentation/devicetree/bindings/dma/stm32-dma.txt index 0b55718bf889..c5f519097204 100644 --- a/Documentation/devicetree/bindings/dma/stm32-dma.txt +++ b/Documentation/devicetree/bindings/dma/stm32-dma.txt @@ -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 { |