xref: /kernel/linux/linux-6.6/Documentation/devicetree/bindings/dma/fsl-qdma.txt (revision 62306a36)

NXP Layerscape SoC qDMA Controller
==================================

This device follows the generic DMA bindings defined in dma/dma.txt.

Required properties:

- compatible:		Must be one of
			 "fsl,ls1021a-qdma": for LS1021A Board
			 "fsl,ls1028a-qdma": for LS1028A Board
			 "fsl,ls1043a-qdma": for ls1043A Board
			 "fsl,ls1046a-qdma": for ls1046A Board
- reg:			Should contain the register's base address and length.
- interrupts:		Should contain a reference to the interrupt used by this
			device.
- interrupt-names:	Should contain interrupt names:
			 "qdma-queue0": the block0 interrupt
			 "qdma-queue1": the block1 interrupt
			 "qdma-queue2": the block2 interrupt
			 "qdma-queue3": the block3 interrupt
			 "qdma-error":  the error interrupt
- fsl,dma-queues:	Should contain number of queues supported.
- dma-channels:	Number of DMA channels supported
- block-number:	the virtual block number
- block-offset:	the offset of different virtual block
- status-sizes:	status queue size of per virtual block
- queue-sizes:		command queue size of per virtual block, the size number
			based on queues

Optional properties:

- dma-channels:		Number of DMA channels supported by the controller.
- big-endian:		If present registers and hardware scatter/gather descriptors
			of the qDMA are implemented in big endian mode, otherwise in little
			mode.

Examples:

	qdma: dma-controller@8390000 {
			compatible = "fsl,ls1021a-qdma";
			reg = <0x0 0x8388000 0x0 0x1000>, /* Controller regs */
			      <0x0 0x8389000 0x0 0x1000>, /* Status regs */
			      <0x0 0x838a000 0x0 0x2000>; /* Block regs */
			interrupts = <GIC_SPI 185 IRQ_TYPE_LEVEL_HIGH>,
				     <GIC_SPI 76 IRQ_TYPE_LEVEL_HIGH>,
				     <GIC_SPI 77 IRQ_TYPE_LEVEL_HIGH>;
			interrupt-names = "qdma-error",
				"qdma-queue0", "qdma-queue1";
			dma-channels = <8>;
			block-number = <2>;
			block-offset = <0x1000>;
			fsl,dma-queues = <2>;
			status-sizes = <64>;
			queue-sizes = <64 64>;
			big-endian;
		};

DMA clients must use the format described in dma/dma.txt file.