| Message ID | 20211011143652.51976-3-paul@crapouillou.net (mailing list archive) |
|---|---|
| State | Not Applicable |
| Headers | show |
| Series | dmaengine: dma-jz4780: Driver updates | expand |
On 11-10-21, 16:36, Paul Cercueil wrote: > Extend the binding to support specifying a different request type for > each direction. > > Signed-off-by: Paul Cercueil <paul@crapouillou.net> > --- > Documentation/devicetree/bindings/dma/ingenic,dma.yaml | 8 ++++++-- > 1 file changed, 6 insertions(+), 2 deletions(-) > > diff --git a/Documentation/devicetree/bindings/dma/ingenic,dma.yaml b/Documentation/devicetree/bindings/dma/ingenic,dma.yaml > index f45fd5235879..51b41e4795a2 100644 > --- a/Documentation/devicetree/bindings/dma/ingenic,dma.yaml > +++ b/Documentation/devicetree/bindings/dma/ingenic,dma.yaml > @@ -44,13 +44,17 @@ properties: > maxItems: 1 > > "#dma-cells": > - const: 2 > + enum: [2, 3] > description: > > DMA clients must use the format described in dma.txt, giving a phandle > - to the DMA controller plus the following 2 integer cells: > + to the DMA controller plus the following integer cells: > > - Request type: The DMA request type for transfers to/from the > device on the allocated channel, as defined in the SoC documentation. > + If "#dma-cells" is 2, the request type is a single cell. If > + "#dma-cells" is 3, the request type has two cells; the first one > + corresponds to the host to device direction, the second one corresponds > + to the device to host direction. Why would you need the direction here, that should be a runtime parameter and not a DT one? > > - Channel: If set to 0xffffffff, any available channel will be allocated > for the client. Otherwise, the exact channel specified will be used. > -- > 2.33.0
diff --git a/Documentation/devicetree/bindings/dma/ingenic,dma.yaml b/Documentation/devicetree/bindings/dma/ingenic,dma.yaml index f45fd5235879..51b41e4795a2 100644 --- a/Documentation/devicetree/bindings/dma/ingenic,dma.yaml +++ b/Documentation/devicetree/bindings/dma/ingenic,dma.yaml @@ -44,13 +44,17 @@ properties: maxItems: 1 "#dma-cells": - const: 2 + enum: [2, 3] description: > DMA clients must use the format described in dma.txt, giving a phandle - to the DMA controller plus the following 2 integer cells: + to the DMA controller plus the following integer cells: - Request type: The DMA request type for transfers to/from the device on the allocated channel, as defined in the SoC documentation. + If "#dma-cells" is 2, the request type is a single cell. If + "#dma-cells" is 3, the request type has two cells; the first one + corresponds to the host to device direction, the second one corresponds + to the device to host direction. - Channel: If set to 0xffffffff, any available channel will be allocated for the client. Otherwise, the exact channel specified will be used.
Extend the binding to support specifying a different request type for each direction. Signed-off-by: Paul Cercueil <paul@crapouillou.net> --- Documentation/devicetree/bindings/dma/ingenic,dma.yaml | 8 ++++++-- 1 file changed, 6 insertions(+), 2 deletions(-)