linux-kernel - [PATCH v3 3/5] dt-bindings: stm32-dma: Add property to handle STM32 DMAMUX

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Message-ID: <1499343623-5964-4-git-send-email-pierre-yves.mordret@st.com>
Date:   Thu, 6 Jul 2017 14:20:21 +0200
From:   Pierre-Yves MORDRET <pierre-yves.mordret@...com>
To:     Vinod Koul <vinod.koul@...el.com>,
        Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Maxime Coquelin <mcoquelin.stm32@...il.com>,
        Alexandre Torgue <alexandre.torgue@...com>,
        Russell King <linux@...linux.org.uk>,
        Dan Williams <dan.j.williams@...el.com>,
        "M'boumba Cedric Madianga" <cedric.madianga@...il.com>,
        Fabrice GASNIER <fabrice.gasnier@...com>,
        Herbert Xu <herbert@...dor.apana.org.au>,
        Fabien DESSENNE <fabien.dessenne@...com>,
        Amelie Delaunay <amelie.delaunay@...com>,
        Pierre-Yves MORDRET <pierre-yves.mordret@...com>,
        <dmaengine@...r.kernel.org>, <devicetree@...r.kernel.org>,
        <linux-arm-kernel@...ts.infradead.org>,
        <linux-kernel@...r.kernel.org>
Subject: [PATCH v3 3/5] dt-bindings: stm32-dma: Add property to handle STM32 DMAMUX

This patch adds an optional property needed for STM32 DMA controller
addressed via STM32 DMAMUX.

Signed-off-by: M'boumba Cedric Madianga <cedric.madianga@...il.com>
Signed-off-by: Pierre-Yves MORDRET <pierre-yves.mordret@...com>
---
 Version history:
    v3:
        * None
    v2:
        * Typo fix
---
---
 Documentation/devicetree/bindings/dma/stm32-dma.txt | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/Documentation/devicetree/bindings/dma/stm32-dma.txt b/Documentation/devicetree/bindings/dma/stm32-dma.txt
index 4408af6..340c918 100644
--- a/Documentation/devicetree/bindings/dma/stm32-dma.txt
+++ b/Documentation/devicetree/bindings/dma/stm32-dma.txt
@@ -16,6 +16,9 @@ Optional properties:
 - resets: Reference to a reset controller asserting the DMA controller
 - st,mem2mem: boolean; if defined, it indicates that the controller supports
   memory-to-memory transfer
+- st,dmamux: boolean; if defined, it indicates that the controller is behind a
+  DMA multiplexer. In that case, using dma instances doesn't work for DMA
+  clients. They have to use dma-router instances.
 
 Example:
 
@@ -39,7 +42,7 @@ Example:
 * DMA client
 
 DMA clients connected to the STM32 DMA controller must use the format
-described in the dma.txt file, using a five-cell specifier for each
+described in the dma.txt file, using a four-cell specifier for each
 channel: a phandle to the DMA controller plus the following four integer cells:
 
 1. The channel id
-- 
2.7.4