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

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Message-ID: <20210714192705.GA3078178@robh.at.kernel.org>
Date:   Wed, 14 Jul 2021 13:27:05 -0600
From:   Rob Herring <robh@...nel.org>
To:     Amelie Delaunay <amelie.delaunay@...s.st.com>
Cc:     Pierre-Yves Mordret <pierre-yves.mordret@...s.st.com>,
        Dan Williams <dan.j.williams@...el.com>,
        Vinod Koul <vkoul@...nel.org>,
        Rob Herring <robh+dt@...nel.org>, dmaengine@...r.kernel.org,
        Alexandre Torgue <alexandre.torgue@...s.st.com>,
        Maxime Coquelin <mcoquelin.stm32@...il.com>,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-stm32@...md-mailman.stormreply.com,
        linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH 1/2] dt-bindings: dma: add alternative REQ/ACK protocol
 selection in stm32-dma

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@...s.st.com>
> ---
>  Documentation/devicetree/bindings/dma/st,stm32-dma.yaml | 7 +++++++
>  1 file changed, 7 insertions(+)
> 

Acked-by: Rob Herring <robh@...nel.org>