| * Synopsys Designware DMA Controller |
| |
| Required properties: |
| - compatible: "snps,dma-spear1340" |
| - reg: Address range of the DMAC registers |
| - interrupt-parent: Should be the phandle for the interrupt controller |
| that services interrupts for this device |
| - interrupt: Should contain the DMAC interrupt number |
| - nr_channels: Number of channels supported by hardware |
| - is_private: The device channels should be marked as private and not for by the |
| general purpose DMA channel allocator. False if not passed. |
| - chan_allocation_order: order of allocation of channel, 0 (default): ascending, |
| 1: descending |
| - chan_priority: priority of channels. 0 (default): increase from chan 0->n, 1: |
| increase from chan n->0 |
| - block_size: Maximum block size supported by the controller |
| - nr_masters: Number of AHB masters supported by the controller |
| - data_width: Maximum data width supported by hardware per AHB master |
| (0 - 8bits, 1 - 16bits, ..., 5 - 256bits) |
| - slave_info: |
| - bus_id: name of this device channel, not just a device name since |
| devices may have more than one channel e.g. "foo_tx". For using the |
| dw_generic_filter(), slave drivers must pass exactly this string as |
| param to filter function. |
| - cfg_hi: Platform-specific initializer for the CFG_HI register |
| - cfg_lo: Platform-specific initializer for the CFG_LO register |
| - src_master: src master for transfers on allocated channel. |
| - dst_master: dest master for transfers on allocated channel. |
| |
| Example: |
| |
| dma@fc000000 { |
| compatible = "snps,dma-spear1340"; |
| reg = <0xfc000000 0x1000>; |
| interrupt-parent = <&vic1>; |
| interrupts = <12>; |
| |
| nr_channels = <8>; |
| chan_allocation_order = <1>; |
| chan_priority = <1>; |
| block_size = <0xfff>; |
| nr_masters = <2>; |
| data_width = <3 3 0 0>; |
| |
| slave_info { |
| uart0-tx { |
| bus_id = "uart0-tx"; |
| cfg_hi = <0x4000>; /* 0x8 << 11 */ |
| cfg_lo = <0>; |
| src_master = <0>; |
| dst_master = <1>; |
| }; |
| spi0-tx { |
| bus_id = "spi0-tx"; |
| cfg_hi = <0x2000>; /* 0x4 << 11 */ |
| cfg_lo = <0>; |
| src_master = <0>; |
| dst_master = <0>; |
| }; |
| }; |
| }; |