mirror of
https://github.com/torvalds/linux.git
synced 2024-12-24 20:01:55 +00:00
2e041c9462
move to support of_dma_request_slave_channel() and dma_request_slave_channel. we add a xlate() to let dma clients be able to find right dma_chan by generic "dmas" properties in dts. Cc: Mark Rutland <mark.rutland@arm.com> Cc: Lars-Peter Clausen <lars@metafoo.de> Signed-off-by: Barry Song <Baohua.Song@csr.com> Acked-by: Arnd Bergmann <arnd@arndb.de> Signed-off-by: Vinod Koul <vinod.koul@intel.com>
44 lines
1.1 KiB
Plaintext
44 lines
1.1 KiB
Plaintext
* CSR SiRFSoC DMA controller
|
|
|
|
See dma.txt first
|
|
|
|
Required properties:
|
|
- compatible: Should be "sirf,prima2-dmac" or "sirf,marco-dmac"
|
|
- reg: Should contain DMA registers location and length.
|
|
- interrupts: Should contain one interrupt shared by all channel
|
|
- #dma-cells: must be <1>. used to represent the number of integer
|
|
cells in the dmas property of client device.
|
|
- clocks: clock required
|
|
|
|
Example:
|
|
|
|
Controller:
|
|
dmac0: dma-controller@b00b0000 {
|
|
compatible = "sirf,prima2-dmac";
|
|
reg = <0xb00b0000 0x10000>;
|
|
interrupts = <12>;
|
|
clocks = <&clks 24>;
|
|
#dma-cells = <1>;
|
|
};
|
|
|
|
|
|
Client:
|
|
Fill the specific dma request line in dmas. In the below example, spi0 read
|
|
channel request line is 9 of the 2nd dma controller, while write channel uses
|
|
4 of the 2nd dma controller; spi1 read channel request line is 12 of the 1st
|
|
dma controller, while write channel uses 13 of the 1st dma controller:
|
|
|
|
spi0: spi@b00d0000 {
|
|
compatible = "sirf,prima2-spi";
|
|
dmas = <&dmac1 9>,
|
|
<&dmac1 4>;
|
|
dma-names = "rx", "tx";
|
|
};
|
|
|
|
spi1: spi@b0170000 {
|
|
compatible = "sirf,prima2-spi";
|
|
dmas = <&dmac0 12>,
|
|
<&dmac0 13>;
|
|
dma-names = "rx", "tx";
|
|
};
|