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Diffstat (limited to 'Documentation/devicetree/bindings/dma/ingenic,dma.yaml')
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1 files changed, 80 insertions, 0 deletions
diff --git a/Documentation/devicetree/bindings/dma/ingenic,dma.yaml b/Documentation/devicetree/bindings/dma/ingenic,dma.yaml new file mode 100644 index 000000000000..92794c500589 --- /dev/null +++ b/Documentation/devicetree/bindings/dma/ingenic,dma.yaml @@ -0,0 +1,80 @@ +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause) +%YAML 1.2 +--- +$id: http://devicetree.org/schemas/dma/ingenic,dma.yaml# +$schema: http://devicetree.org/meta-schemas/core.yaml# + +title: Ingenic SoCs DMA Controller DT bindings + +maintainers: + - Paul Cercueil <paul@crapouillou.net> + +allOf: + - $ref: "dma-controller.yaml#" + +properties: + compatible: + enum: + - ingenic,jz4740-dma + - ingenic,jz4725b-dma + - ingenic,jz4770-dma + - ingenic,jz4780-dma + - ingenic,x1000-dma + - ingenic,x1830-dma + + reg: + items: + - description: Channel-specific registers + - description: System control registers + + interrupts: + maxItems: 1 + + clocks: + maxItems: 1 + + "#dma-cells": + const: 2 + description: > + DMA clients must use the format described in dma.txt, giving a phandle + to the DMA controller plus the following 2 integer cells: + + - Request type: The DMA request type for transfers to/from the + device on the allocated channel, as defined in the SoC documentation. + + - Channel: If set to 0xffffffff, any available channel will be allocated + for the client. Otherwise, the exact channel specified will be used. + The channel should be reserved on the DMA controller using the + ingenic,reserved-channels property. + + ingenic,reserved-channels: + $ref: /schemas/types.yaml#definitions/uint32 + description: > + Bitmask of channels to reserve for devices that need a specific + channel. These channels will only be assigned when explicitely + requested by a client. The primary use for this is channels 0 and + 1, which can be configured to have special behaviour for NAND/BCH + when using programmable firmware. + +required: + - compatible + - reg + - interrupts + - clocks + +examples: + - | + #include <dt-bindings/clock/jz4780-cgu.h> + dma: dma-controller@13420000 { + compatible = "ingenic,jz4780-dma"; + reg = <0x13420000 0x400>, <0x13421000 0x40>; + + interrupt-parent = <&intc>; + interrupts = <10>; + + clocks = <&cgu JZ4780_CLK_PDMA>; + + #dma-cells = <2>; + + ingenic,reserved-channels = <0x3>; + }; |