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

[M'boumba Cedric Madianga]

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

Signed-off-by: M'boumba Cedric Madianga <cedric.madianga at gmail.com>
---
 Documentation/devicetree/bindings/dma/stm32-dma.txt | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/Documentation/devicetree/bindings/dma/stm32-dma.txt b/Documentation/devicetree/bindings/dma/stm32-dma.txt
index 4408af6..7b5e91a 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:
 
-- 
1.9.1