mirror of
https://github.com/AuxXxilium/linux_dsm_epyc7002.git
synced 2024-12-21 08:46:49 +07:00
13098cf05a
The value to set ASAP mode for FIFO configuration is 2 instead of 1. Signed-off-by: Ludovic Desroches <ludovic.desroches@atmel.com> Acked-by: Nicolas Ferre <nicolas.ferre@atmel.com> Signed-off-by: Vinod Koul <vinod.koul@intel.com>
43 lines
1.3 KiB
Plaintext
43 lines
1.3 KiB
Plaintext
* Atmel Direct Memory Access Controller (DMA)
|
|
|
|
Required properties:
|
|
- compatible: Should be "atmel,<chip>-dma".
|
|
- reg: Should contain DMA registers location and length.
|
|
- interrupts: Should contain DMA interrupt.
|
|
- #dma-cells: Must be <2>, used to represent the number of integer cells in
|
|
the dmas property of client devices.
|
|
|
|
Example:
|
|
|
|
dma0: dma@ffffec00 {
|
|
compatible = "atmel,at91sam9g45-dma";
|
|
reg = <0xffffec00 0x200>;
|
|
interrupts = <21>;
|
|
#dma-cells = <2>;
|
|
};
|
|
|
|
DMA clients connected to the Atmel DMA controller must use the format
|
|
described in the dma.txt file, using a three-cell specifier for each channel:
|
|
a phandle plus two integer cells.
|
|
The three cells in order are:
|
|
|
|
1. A phandle pointing to the DMA controller.
|
|
2. The memory interface (16 most significant bits), the peripheral interface
|
|
(16 less significant bits).
|
|
3. Parameters for the at91 DMA configuration register which are device
|
|
dependent:
|
|
- bit 7-0: peripheral identifier for the hardware handshaking interface. The
|
|
identifier can be different for tx and rx.
|
|
- bit 11-8: FIFO configuration. 0 for half FIFO, 1 for ALAP, 2 for ASAP.
|
|
|
|
Example:
|
|
|
|
i2c0@i2c@f8010000 {
|
|
compatible = "atmel,at91sam9x5-i2c";
|
|
reg = <0xf8010000 0x100>;
|
|
interrupts = <9 4 6>;
|
|
dmas = <&dma0 1 7>,
|
|
<&dma0 1 8>;
|
|
dma-names = "tx", "rx";
|
|
};
|