[PATCH 1/2] dt-bindings: dma: add alternative REQ/ACK protocol selection in stm32-dma

[Rob Herring]

On Thu, 24 Jun 2021 11:39:58 +0200, Amelie Delaunay wrote:
> Default REQ/ACK protocol consists in maintaining ACK signal up to the
> removal of REQuest and the transfer completion.
> In case of alternative REQ/ACK protocol, ACK de-assertion does not wait the
> removal of the REQuest, but only the transfer completion.
> Due to a possible DMA stream lock when transferring data to/from STM32
> USART/UART, this new bindings allow to select this alternative protocol in
> device tree, especially for STM32 USART/UART nodes.
> 
> Signed-off-by: Amelie Delaunay <amelie.delaunay at foss.st.com>
> ---
>  Documentation/devicetree/bindings/dma/st,stm32-dma.yaml | 7 +++++++
>  1 file changed, 7 insertions(+)
> 

Acked-by: Rob Herring <robh at kernel.org>