On 19/06/2020 10:04, EastL wrote: > Document the devicetree bindings for MediaTek Command-Queue DMA controller > which could be found on MT6779 SoC or other similar Mediatek SoCs. > > Signed-off-by: EastL <EastL.Lee@xxxxxxxxxxxx> Still missing the full name. > --- > .../devicetree/bindings/dma/mtk-cqdma.yaml | 114 +++++++++++++++++++++ > 1 file changed, 114 insertions(+) > create mode 100644 Documentation/devicetree/bindings/dma/mtk-cqdma.yaml > > diff --git a/Documentation/devicetree/bindings/dma/mtk-cqdma.yaml b/Documentation/devicetree/bindings/dma/mtk-cqdma.yaml > new file mode 100644 > index 0000000..e6fdf05 > --- /dev/null > +++ b/Documentation/devicetree/bindings/dma/mtk-cqdma.yaml > @@ -0,0 +1,114 @@ > +# SPDX-License-Identifier: GPL-2.0-only OR BSD-2-Clause You missed the brackets (). > +%YAML 1.2 > +--- > +$id: http://devicetree.org/schemas/dma/mtk-cqdma.yaml# > +$schema: http://devicetree.org/meta-schemas/core.yaml# > + > +title: MediaTek Command-Queue DMA controller Device Tree Binding > + > +maintainers: > + - EastL Lee <EastL.Lee@xxxxxxxxxxxx> > + > +description: > + MediaTek Command-Queue DMA controller (CQDMA) on Mediatek SoC > + is dedicated to memory-to-memory transfer through queue based > + descriptor management. > + > +allOf: > + - $ref: "dma-controller.yaml#" > + > +properties: > + "#dma-cells": > + minimum: 1 > + maximum: 255 > + description: > + Used to provide DMA controller specific information. > + > + compatible: > + oneOf: > + - const: mediatek,common-cqdma What is the common-cqdma for if we have only one compatible specifying the SoC. Actually I'm not a great fan of the common-cqdma thing. I'd prefer a fallback compatible that has the name of the first SoC implementing the same device. Regards, Matthias > + - const: mediatek,mt6765-cqdma > + - const: mediatek,mt6779-cqdma > + > + reg: > + minItems: 1 > + maxItems: 5 > + description: > + A base address of MediaTek Command-Queue DMA controller, > + a channel will have a set of base address. > + > + interrupts: > + minItems: 1 > + maxItems: 5 > + description: > + A interrupt number of MediaTek Command-Queue DMA controller, > + one interrupt number per dma-channels. > + > + clocks: > + maxItems: 1 > + > + clock-names: > + const: cqdma > + > + dma-channel-mask: > + $ref: /schemas/types.yaml#definitions/uint32 > + description: > + For DMA capability, We will know the addressing capability of > + MediaTek Command-Queue DMA controller through dma-channel-mask. > + items: > + minItems: 1 > + maxItems: 63 > + > + dma-channels: > + $ref: /schemas/types.yaml#definitions/uint32 > + description: > + Number of DMA channels supported by MediaTek Command-Queue DMA > + controller, support up to five. > + items: > + minItems: 1 > + maxItems: 5 > + > + dma-requests: > + $ref: /schemas/types.yaml#definitions/uint32 > + description: > + Number of DMA request (virtual channel) supported by MediaTek > + Command-Queue DMA controller, support up to 32. > + items: > + minItems: 1 > + maxItems: 32 > + > +required: > + - "#dma-cells" > + - compatible > + - reg > + - interrupts > + - clocks > + - clock-names > + - dma-channel-mask > + - dma-channels > + - dma-requests > + > +additionalProperties: false > + > +examples: > + - | > + #include <dt-bindings/interrupt-controller/irq.h> > + #include <dt-bindings/interrupt-controller/arm-gic.h> > + #include <dt-bindings/clock/mt6779-clk.h> > + cqdma: dma-controller@10212000 { > + compatible = "mediatek,mt6779-cqdma"; > + reg = <0x10212000 0x80>, > + <0x10212080 0x80>, > + <0x10212100 0x80>; > + interrupts = <GIC_SPI 139 IRQ_TYPE_LEVEL_LOW>, > + <GIC_SPI 140 IRQ_TYPE_LEVEL_LOW>, > + <GIC_SPI 141 IRQ_TYPE_LEVEL_LOW>; > + clocks = <&infracfg_ao CLK_INFRA_CQ_DMA>; > + clock-names = "cqdma"; > + dma-channel-mask = <63>; > + dma-channels = <3>; > + dma-requests = <32>; > + #dma-cells = <1>; > + }; > + > +... >
