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From: Amelie Delaunay <amelie.delaunay@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@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@st.com>,
	Pierre-Yves Mordret <pierre-yves.mordret@st.com>
Subject: [PATCH 1/2] dt-bindings: dma: add direct mode support through device tree in stm32-dma
Date: Wed, 22 Apr 2020 12:29:03 +0200	[thread overview]
Message-ID: <20200422102904.1448-2-amelie.delaunay@st.com> (raw)
In-Reply-To: <20200422102904.1448-1-amelie.delaunay@st.com>

Direct mode or FIFO mode is computed by stm32-dma driver. Add a way for the
user to force direct mode, by setting bit 2 in the bitfield value
specifying DMA features in the device tree.

Signed-off-by: Amelie Delaunay <amelie.delaunay@st.com>
---
 Documentation/devicetree/bindings/dma/st,stm32-dma.yaml | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/Documentation/devicetree/bindings/dma/st,stm32-dma.yaml b/Documentation/devicetree/bindings/dma/st,stm32-dma.yaml
index 0c0ac11ad55f..71987878e4ae 100644
--- a/Documentation/devicetree/bindings/dma/st,stm32-dma.yaml
+++ b/Documentation/devicetree/bindings/dma/st,stm32-dma.yaml
@@ -36,6 +36,11 @@ description: |
          0x1: 1/2 full FIFO
          0x2: 3/4 full FIFO
          0x3: full FIFO
+       -bit 2: DMA direct mode
+         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.
+
 
 maintainers:
   - Amelie Delaunay <amelie.delaunay@st.com>
-- 
2.17.1


WARNING: multiple messages have this Message-ID (diff)
From: Amelie Delaunay <amelie.delaunay@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@st.com>
Cc: devicetree@vger.kernel.org,
	Amelie Delaunay <amelie.delaunay@st.com>,
	linux-kernel@vger.kernel.org,
	Pierre-Yves Mordret <pierre-yves.mordret@st.com>,
	dmaengine@vger.kernel.org,
	linux-stm32@st-md-mailman.stormreply.com,
	linux-arm-kernel@lists.infradead.org
Subject: [PATCH 1/2] dt-bindings: dma: add direct mode support through device tree in stm32-dma
Date: Wed, 22 Apr 2020 12:29:03 +0200	[thread overview]
Message-ID: <20200422102904.1448-2-amelie.delaunay@st.com> (raw)
In-Reply-To: <20200422102904.1448-1-amelie.delaunay@st.com>

Direct mode or FIFO mode is computed by stm32-dma driver. Add a way for the
user to force direct mode, by setting bit 2 in the bitfield value
specifying DMA features in the device tree.

Signed-off-by: Amelie Delaunay <amelie.delaunay@st.com>
---
 Documentation/devicetree/bindings/dma/st,stm32-dma.yaml | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/Documentation/devicetree/bindings/dma/st,stm32-dma.yaml b/Documentation/devicetree/bindings/dma/st,stm32-dma.yaml
index 0c0ac11ad55f..71987878e4ae 100644
--- a/Documentation/devicetree/bindings/dma/st,stm32-dma.yaml
+++ b/Documentation/devicetree/bindings/dma/st,stm32-dma.yaml
@@ -36,6 +36,11 @@ description: |
          0x1: 1/2 full FIFO
          0x2: 3/4 full FIFO
          0x3: full FIFO
+       -bit 2: DMA direct mode
+         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.
+
 
 maintainers:
   - Amelie Delaunay <amelie.delaunay@st.com>
-- 
2.17.1


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  reply	other threads:[~2020-04-22 10:30 UTC|newest]

Thread overview: 8+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-04-22 10:29 [PATCH 0/2] STM32 DMA Direct mode Amelie Delaunay
2020-04-22 10:29 ` Amelie Delaunay
2020-04-22 10:29 ` Amelie Delaunay [this message]
2020-04-22 10:29   ` [PATCH 1/2] dt-bindings: dma: add direct mode support through device tree in stm32-dma Amelie Delaunay
2020-04-22 10:29 ` [PATCH 2/2] dmaengine: stm32-dma: direct mode support through device tree Amelie Delaunay
2020-04-22 10:29   ` Amelie Delaunay
2020-04-27 16:10 ` [PATCH 0/2] STM32 DMA Direct mode Vinod Koul
2020-04-27 16:10   ` Vinod Koul

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