On 21 August 2018 at 15:17, Masahiro Yamada <yamada.masahiro@xxxxxxxxxxxxx> wrote: > (+CC Rob, DT, LKML) > > I forgot to CC this to DT community... > > > 2018-08-21 18:30 GMT+09:00 Masahiro Yamada <yamada.masahiro@xxxxxxxxxxxxx>: >> The MIO DMAC (Media IO DMA Controller) is used in UniPhier LD4, >> Pro4, and sLD8 SoCs. >> >> Signed-off-by: Masahiro Yamada <yamada.masahiro@xxxxxxxxxxxxx> >> --- >> >> .../devicetree/bindings/dma/uniphier-mio-dmac.txt | 28 ++++++++++++++++++++++ >> 1 file changed, 28 insertions(+) >> create mode 100644 Documentation/devicetree/bindings/dma/uniphier-mio-dmac.txt >> >> diff --git a/Documentation/devicetree/bindings/dma/uniphier-mio-dmac.txt b/Documentation/devicetree/bindings/dma/uniphier-mio-dmac.txt >> new file mode 100644 >> index 0000000..a9e969e >> --- /dev/null >> +++ b/Documentation/devicetree/bindings/dma/uniphier-mio-dmac.txt >> @@ -0,0 +1,28 @@ >> +UniPhier Media IO DMA controller >> + >> +This works as an external DMA engine for SD/eMMC controllers etc. >> +found in UniPhier LD4, Pro4, sLD8 SoCs. >> + >> +Required properties: >> +- compatible: should be "socionext,uniphier-mio-dmac". >> +- reg: offset and length of the register set for the device. >> +- interrupts: a list of interrupt specifiers associated with the DMA channels. >> +- clocks: a single clock specifier >> +- #dma-cells: should be <1>. The single cell represents the channel number. >> +- dma-channels: specify the number of the DMA channels. This should match to >> + the number of tuples in the interrupts property. >> + Can we not infer the number of channels from interrupt tuples? After all the driver assumes they are same.
