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From:   Amelie Delaunay <amelie.delaunay@foss.st.com>
To:     Vinod Koul <vkoul@kernel.org>, Rob Herring <robh+dt@kernel.org>,
        Dan Williams <dan.j.williams@intel.com>,
        Maxime Coquelin <mcoquelin.stm32@gmail.com>,
        Alexandre Torgue <alexandre.torgue@foss.st.com>
CC:     <dmaengine@vger.kernel.org>, <devicetree@vger.kernel.org>,
        <linux-stm32@st-md-mailman.stormreply.com>,
        <linux-arm-kernel@lists.infradead.org>,
        <linux-kernel@vger.kernel.org>,
        Amelie Delaunay <amelie.delaunay@foss.st.com>,
        Pierre-Yves Mordret <pierre-yves.mordret@foss.st.com>
Subject: [PATCH 1/2] dt-bindings: dma: add alternative REQ/ACK protocol selection in stm32-dma
Date:   Thu, 24 Jun 2021 11:39:58 +0200
Message-ID: <20210624093959.142265-2-amelie.delaunay@foss.st.com>
In-Reply-To: <20210624093959.142265-1-amelie.delaunay@foss.st.com>
References: <20210624093959.142265-1-amelie.delaunay@foss.st.com>
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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(+)

diff --git a/Documentation/devicetree/bindings/dma/st,stm32-dma.yaml b/Documentation/devicetree/bindings/dma/st,stm32-dma.yaml
index 2a5325f480f6..4bf676fd25dc 100644
--- a/Documentation/devicetree/bindings/dma/st,stm32-dma.yaml
+++ b/Documentation/devicetree/bindings/dma/st,stm32-dma.yaml
@@ -40,6 +40,13 @@ description: |
          0x0: FIFO mode with threshold selectable with bit 0-1
          0x1: Direct mode: each DMA request immediately initiates a transfer
               from/to the memory, FIFO is bypassed.
+       -bit 4: alternative DMA request/acknowledge protocol
+         0x0: Use standard DMA ACK management, where ACK signal is maintained
+              up to the removal of request and transfer completion
+         0x1: Use alternative DMA ACK management, where ACK de-assertion does
+              not wait for the de-assertion of the REQuest, ACK is only managed
+              by transfer completion. This must only be used on channels
+              managing transfers for STM32 USART/UART.
 
 
 maintainers:
-- 
2.25.1