linux-kernel - [RESEND PATCH 0/2] STM32 DMA alternative REQ/ACK protocol support

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Date:   Wed, 21 Jul 2021 13:39:44 +0200
From:   Amelie Delaunay <amelie.delaunay@...s.st.com>
To:     Vinod Koul <vkoul@...nel.org>, Rob Herring <robh+dt@...nel.org>,
        Dan Williams <dan.j.williams@...el.com>,
        Maxime Coquelin <mcoquelin.stm32@...il.com>,
        Alexandre Torgue <alexandre.torgue@...s.st.com>
CC:     <dmaengine@...r.kernel.org>, <devicetree@...r.kernel.org>,
        <linux-stm32@...md-mailman.stormreply.com>,
        <linux-arm-kernel@...ts.infradead.org>,
        <linux-kernel@...r.kernel.org>,
        Amelie Delaunay <amelie.delaunay@...s.st.com>,
        Pierre-Yves Mordret <pierre-yves.mordret@...s.st.com>
Subject: [RESEND PATCH 0/2] STM32 DMA alternative REQ/ACK protocol support

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, add support to select alternative REQ/ACK protocol.

Amelie Delaunay (2):
  dt-bindings: dma: add alternative REQ/ACK protocol selection in
    stm32-dma
  dmaengine: stm32-dma: add alternate REQ/ACK protocol management

 Documentation/devicetree/bindings/dma/st,stm32-dma.yaml | 7 +++++++
 drivers/dma/stm32-dma.c                                 | 8 ++++++--
 2 files changed, 13 insertions(+), 2 deletions(-)

-- 
2.25.1