| Message ID | 20170903224100.17893-7-stefan.bruens@rwth-aachen.de |
|---|---|
| State | New |
| Headers | show |
| Series | dmaengine: sun6i: Fixes for H3/A83T, enable A64 | expand |
On Mon, Sep 04, 2017 at 12:40:57AM +0200, Stefan Brüns wrote: > The A64 is register compatible with the H3, but has a different number > of dma channels and request ports. > > Attach additional properties to the node to allow future reuse of the > compatible for controllers with different number of channels/requests. > > If dma-requests is not specified, the register layout defined maximum > of 32 is used. This belongs in the binding. > > Signed-off-by: Stefan Brüns <stefan.bruens@rwth-aachen.de> > --- > .../devicetree/bindings/dma/sun6i-dma.txt | 26 ++++++++++++++++++++++ > 1 file changed, 26 insertions(+) > > diff --git a/Documentation/devicetree/bindings/dma/sun6i-dma.txt b/Documentation/devicetree/bindings/dma/sun6i-dma.txt > index 6b267045f522..66195fb31296 100644 > --- a/Documentation/devicetree/bindings/dma/sun6i-dma.txt > +++ b/Documentation/devicetree/bindings/dma/sun6i-dma.txt > @@ -26,6 +26,32 @@ Example: > #dma-cells = <1>; > }; > > +------------------------------------------------------------------------------ > +For A64 DMA controller: > + > +Required properties: > +- compatible: "allwinner,sun50i-a64-dma" > +- dma-channels: Number of DMA channels supported by the controller. > + Refer to Documentation/devicetree/bindings/dma/dma.txt dma.txt already explains what these properties are. You just need to state what are valid values. > +- all properties above, i.e. reg, interrupts, clocks, resets and #dma-cells > + > +Optional properties: > +- dma-requests: Number of DMA request signals supported by the controller. > + Refer to Documentation/devicetree/bindings/dma/dma.txt > + > +Example: > + dma: dma-controller@01c02000 { Drop the leading 0. Building dtbs with W=2 will tell you this. > + compatible = "allwinner,sun50i-a64-dma"; > + reg = <0x01c02000 0x1000>; > + interrupts = <GIC_SPI 50 IRQ_TYPE_LEVEL_HIGH>; > + clocks = <&ccu CLK_BUS_DMA>; > + dma-channels = <8>; > + dma-requests = <27>; > + resets = <&ccu RST_BUS_DMA>; > + #dma-cells = <1>; > + }; > +------------------------------------------------------------------------------ > + > Clients: > > DMA clients connected to the A31 DMA controller must use the format > -- > 2.14.1 >
diff --git a/Documentation/devicetree/bindings/dma/sun6i-dma.txt b/Documentation/devicetree/bindings/dma/sun6i-dma.txt index 6b267045f522..66195fb31296 100644 --- a/Documentation/devicetree/bindings/dma/sun6i-dma.txt +++ b/Documentation/devicetree/bindings/dma/sun6i-dma.txt @@ -26,6 +26,32 @@ Example: #dma-cells = <1>; }; +------------------------------------------------------------------------------ +For A64 DMA controller: + +Required properties: +- compatible: "allwinner,sun50i-a64-dma" +- dma-channels: Number of DMA channels supported by the controller. + Refer to Documentation/devicetree/bindings/dma/dma.txt +- all properties above, i.e. reg, interrupts, clocks, resets and #dma-cells + +Optional properties: +- dma-requests: Number of DMA request signals supported by the controller. + Refer to Documentation/devicetree/bindings/dma/dma.txt + +Example: + dma: dma-controller@01c02000 { + compatible = "allwinner,sun50i-a64-dma"; + reg = <0x01c02000 0x1000>; + interrupts = <GIC_SPI 50 IRQ_TYPE_LEVEL_HIGH>; + clocks = <&ccu CLK_BUS_DMA>; + dma-channels = <8>; + dma-requests = <27>; + resets = <&ccu RST_BUS_DMA>; + #dma-cells = <1>; + }; +------------------------------------------------------------------------------ + Clients: DMA clients connected to the A31 DMA controller must use the format
The A64 is register compatible with the H3, but has a different number of dma channels and request ports. Attach additional properties to the node to allow future reuse of the compatible for controllers with different number of channels/requests. If dma-requests is not specified, the register layout defined maximum of 32 is used. Signed-off-by: Stefan Brüns <stefan.bruens@rwth-aachen.de> --- .../devicetree/bindings/dma/sun6i-dma.txt | 26 ++++++++++++++++++++++ 1 file changed, 26 insertions(+)