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dt-bindings: dma: st-stm32-dmamux: Add description for dma-cell values

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The dma-cell values for the stm32-dmamux are used to craft the DMA spec
for the actual controller. These values are currently undocumented
leaving the user to reverse engineer the driver in order to determine
their meaning. Add a basic description, while avoiding duplicating
information by pointing the user to the associated DMA docs that
describe the fields in depth.

Signed-off-by: Ken Sloat <ksloat@cornersoftsolutions.com>
Acked-by: Conor Dooley <conor.dooley@microchip.com>
Reviewed-by: Amelie Delaunay <amelie.delaunay@foss.st.com>
Link: https://lore.kernel.org/r/20241206115018.1155149-1-ksloat@cornersoftsolutions.com
Signed-off-by: Vinod Koul <vkoul@kernel.org>
This commit is contained in:
Ken Sloat 2024-12-06 06:50:18 -05:00 committed by Vinod Koul
parent a131169dfa
commit 54e09c8e2d
1 changed files with 10 additions and 0 deletions
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10
Documentation/devicetree/bindings/dma/stm32/st,stm32-dmamux.yaml
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@ -15,6 +15,16 @@ allOf:
properties:
"#dma-cells":
const: 3
description: |
Each cell represents the following:
1. The mux input number/line for the request
2. Bitfield representing DMA channel configuration that is passed
to the real DMA controller
3. Bitfield representing device dependent DMA features passed to
the real DMA controller
For bitfield definitions of cells 2 and 3, see the associated
bindings doc for the actual DMA controller in st,stm32-dma.yaml.
compatible:
const: st,stm32h7-dmamux