mirror of
https://github.com/AuxXxilium/linux_dsm_epyc7002.git
synced 2024-12-27 14:28:55 +07:00
a69d0009aa
Add the option to choose clock on which pin input to SSC (as slave). Default is on TK pin to SSC, add "atmel,clk-from-rk-pin" option to specify the clock is on RK pin to SSC. Signed-off-by: Bo Shen <voice.shen@atmel.com> Acked-by: Nicolas Ferre <nicolas.ferre@atmel.com> Signed-off-by: Mark Brown <broonie@linaro.org>
50 lines
1.6 KiB
Plaintext
50 lines
1.6 KiB
Plaintext
* Atmel SSC driver.
|
|
|
|
Required properties:
|
|
- compatible: "atmel,at91rm9200-ssc" or "atmel,at91sam9g45-ssc"
|
|
- atmel,at91rm9200-ssc: support pdc transfer
|
|
- atmel,at91sam9g45-ssc: support dma transfer
|
|
- reg: Should contain SSC registers location and length
|
|
- interrupts: Should contain SSC interrupt
|
|
- clock-names: tuple listing input clock names.
|
|
Required elements: "pclk"
|
|
- clocks: phandles to input clocks.
|
|
|
|
|
|
Required properties for devices compatible with "atmel,at91sam9g45-ssc":
|
|
- dmas: DMA specifier, consisting of a phandle to DMA controller node,
|
|
the memory interface and SSC DMA channel ID (for tx and rx).
|
|
See Documentation/devicetree/bindings/dma/atmel-dma.txt for details.
|
|
- dma-names: Must be "tx", "rx".
|
|
|
|
Optional properties:
|
|
- atmel,clk-from-rk-pin: bool property.
|
|
- When SSC works in slave mode, according to the hardware design, the
|
|
clock can get from TK pin, and also can get from RK pin. So, add
|
|
this parameter to choose where the clock from.
|
|
- By default the clock is from TK pin, if the clock from RK pin, this
|
|
property is needed.
|
|
|
|
Examples:
|
|
- PDC transfer:
|
|
ssc0: ssc@fffbc000 {
|
|
compatible = "atmel,at91rm9200-ssc";
|
|
reg = <0xfffbc000 0x4000>;
|
|
interrupts = <14 4 5>;
|
|
clocks = <&ssc0_clk>;
|
|
clock-names = "pclk";
|
|
};
|
|
|
|
- DMA transfer:
|
|
ssc0: ssc@f0010000 {
|
|
compatible = "atmel,at91sam9g45-ssc";
|
|
reg = <0xf0010000 0x4000>;
|
|
interrupts = <28 4 5>;
|
|
dmas = <&dma0 1 13>,
|
|
<&dma0 1 14>;
|
|
dma-names = "tx", "rx";
|
|
pinctrl-names = "default";
|
|
pinctrl-0 = <&pinctrl_ssc0_tx &pinctrl_ssc0_rx>;
|
|
status = "disabled";
|
|
};
|