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dt-bindings: dma: snps,dw-axi-dmac: Document optional reset

"make dtbs_check":

Documentation/devicetree/bindings/dma/snps,dw-axi-dmac.yaml
arch/riscv/boot/dts/canaan/sipeed_maix_bit.dt.yaml: dma-controller@50000000: 'resets' does not match any of the regexes: 'pinctrl-[0-9]+'
From schema: Documentation/devicetree/bindings/dma/snps,dw-axi-dmac.yaml

The Synopsys DesignWare AXI DMA Controller on the Canaan K210 SoC
exposes its reset signal.

Signed-off-by: Geert Uytterhoeven <geert@linux-m68k.org>
Acked-by: Rob Herring <robh@kernel.org>
Reviewed-by: Damien Le Moal <damien.lemoal@opensource.wdc.com>
Link: https://lore.kernel.org/r/20211125152008.162571-1-geert@linux-m68k.org
Signed-off-by: Vinod Koul <vkoul@kernel.org>

authored by

Geert Uytterhoeven and committed by
Vinod Koul 0f93f204 76a09663

+3
+3
Documentation/devicetree/bindings/dma/snps,dw-axi-dmac.yaml
··· 53 53 minimum: 1 54 54 maximum: 8 55 55 56 + resets: 57 + maxItems: 1 58 + 56 59 snps,dma-masters: 57 60 description: | 58 61 Number of AXI masters supported by the hardware.