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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>;
                label = "PL330";
          };

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";
                label = "PCIE_0";
          };

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.

Properties inherited from the base binding file, which defines common properties that may be set on many nodes. Not all of these may apply to the “arm,dma-pl330” compatible.

Name	Type	Details
`reg`	`array`	register space This property is required. See Important properties for more information.
`label`	`string`	Human readable string describing the device (used as device_get_binding() argument) This property is required. See Important properties for more information.
`status`	`string`	indicates the operational status of a device Legal values: `'ok'`, `'okay'`, `'disabled'`, `'reserved'`, `'fail'`, `'fail-sss'` See Important properties for more information.
`compatible`	`string-array`	compatible strings This property is required. See Important properties for more information.
`reg-names`	`string-array`	name of each register space
`interrupts`	`array`	interrupts for device See Important properties for more information.
`interrupts-extended`	`compound`	extended interrupt specifier for device
`interrupt-names`	`string-array`	name of each interrupt
`interrupt-parent`	`phandle`	phandle to interrupt controller node
`clocks`	`phandle-array`	Clock gate information
`clock-names`	`string-array`	name of each clock
`#address-cells`	`int`	number of address cells in reg property
`#size-cells`	`int`	number of size cells in reg property
`dmas`	`phandle-array`	DMA channels specifiers
`dma-names`	`string-array`	Provided names of DMA channel specifiers
`io-channels`	`phandle-array`	IO channels specifiers
`io-channel-names`	`string-array`	Provided names of IO channel specifiers
`wakeup-source`	`boolean`	Property to identify that a device can be used as wake up source. When this property is provided a specific flag is set into the device that tells the system that the device is capable of wake up the system. Wake up capable devices are disabled (interruptions will not wake up the system) by default but they can be enabled at runtime if necessary.

Specifier cell names¶

dma cells: channel