arm,dma-pl330

Vendor: ARM Ltd.

Description

These nodes are “dma” bus nodes.

PL330 DMA Controller

A phandle to the DMA controller plus "channel" integer cell specifying
channel to be used for data transfer

Example for pl330 DMA Controller
   pl330: pl330@48300000 {
                compatible = "arm,dma-pl330";
                ...
                dma-channels = <8>;
                #dma-cells = <1>;
          };

If PCIe EP client uses channel 0 for Tx DMA and channel 1 for Rx DMA
   pcie0_ep: pcie@4e100000 {
                compatible = "brcm,iproc-pcie-ep";
                ...
                dmas = <&pl330 0>, <&pl330 1>;
                dma-names = "txdma", "rxdma";
          };

Properties

Properties not inherited from the base binding file.

Name

Type

Details

microcode

array

microcode's physical memory address

This property is required.

#dma-cells

int

Number of items to expect in a DMA specifier

This property is required.

Constant value: 1

dma-channel-mask

int

Bitmask of available DMA channels in ascending order that are
not reserved by firmware and are available to the
kernel. i.e. first channel corresponds to LSB.

dma-channels

int

Number of DMA channels supported by the controller

dma-requests

int

Number of DMA request signals supported by the controller.

dma-buf-addr-alignment

int

Memory address alignment requirement for DMA buffers used by the controller.

dma-buf-size-alignment

int

Memory size alignment requirement for DMA buffers used by the controller.

dma-copy-alignment

int

Minimal chunk of data possible to be copied by the controller.

Specifier cell names

  • dma cells: channel