From: Rob Herring <robh@kernel.org>
To: Amelie Delaunay <amelie.delaunay@foss.st.com>
Cc: Pierre-Yves Mordret <pierre-yves.mordret@foss.st.com>,
Dan Williams <dan.j.williams@intel.com>,
Vinod Koul <vkoul@kernel.org>, Rob Herring <robh+dt@kernel.org>,
dmaengine@vger.kernel.org,
Alexandre Torgue <alexandre.torgue@foss.st.com>,
Maxime Coquelin <mcoquelin.stm32@gmail.com>,
devicetree@vger.kernel.org, linux-kernel@vger.kernel.org,
linux-stm32@st-md-mailman.stormreply.com,
linux-arm-kernel@lists.infradead.org
Subject: Re: [PATCH 1/2] dt-bindings: dma: add alternative REQ/ACK protocol selection in stm32-dma
Date: Wed, 14 Jul 2021 13:27:05 -0600 [thread overview]
Message-ID: <20210714192705.GA3078178@robh.at.kernel.org> (raw)
In-Reply-To: <20210624093959.142265-2-amelie.delaunay@foss.st.com>
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@foss.st.com>
> ---
> Documentation/devicetree/bindings/dma/st,stm32-dma.yaml | 7 +++++++
> 1 file changed, 7 insertions(+)
>
Acked-by: Rob Herring <robh@kernel.org>
next prev parent reply other threads:[~2021-07-14 19:27 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-06-24 9:39 [PATCH 0/2] STM32 DMA alternative REQ/ACK protocol support Amelie Delaunay
2021-06-24 9:39 ` [PATCH 1/2] dt-bindings: dma: add alternative REQ/ACK protocol selection in stm32-dma Amelie Delaunay
2021-07-14 19:27 ` Rob Herring [this message]
2021-06-24 9:39 ` [PATCH 2/2] dmaengine: stm32-dma: add alternate REQ/ACK protocol management Amelie Delaunay
2021-07-28 7:09 ` [PATCH 0/2] STM32 DMA alternative REQ/ACK protocol support Vinod Koul
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