1 * Atmel SSC driver. 1 * Atmel SSC driver.
2 2
3 Required properties: 3 Required properties:
4 - compatible: "atmel,at91rm9200-ssc" or "atmel 4 - compatible: "atmel,at91rm9200-ssc" or "atmel,at91sam9g45-ssc"
5 - atmel,at91rm9200-ssc: support pdc tr 5 - atmel,at91rm9200-ssc: support pdc transfer
6 - atmel,at91sam9g45-ssc: support dma t 6 - atmel,at91sam9g45-ssc: support dma transfer
7 - reg: Should contain SSC registers location a 7 - reg: Should contain SSC registers location and length
8 - interrupts: Should contain SSC interrupt 8 - interrupts: Should contain SSC interrupt
9 - clock-names: tuple listing input clock names 9 - clock-names: tuple listing input clock names.
10 Required elements: "pclk" 10 Required elements: "pclk"
11 - clocks: phandles to input clocks. 11 - clocks: phandles to input clocks.
12 12
13 13
14 Required properties for devices compatible wit 14 Required properties for devices compatible with "atmel,at91sam9g45-ssc":
15 - dmas: DMA specifier, consisting of a phandle 15 - dmas: DMA specifier, consisting of a phandle to DMA controller node,
16 the memory interface and SSC DMA channel ID 16 the memory interface and SSC DMA channel ID (for tx and rx).
17 See Documentation/devicetree/bindings/dma/at 17 See Documentation/devicetree/bindings/dma/atmel-dma.txt for details.
18 - dma-names: Must be "tx", "rx". 18 - dma-names: Must be "tx", "rx".
19 19
20 Optional properties: 20 Optional properties:
21 - atmel,clk-from-rk-pin: bool property. 21 - atmel,clk-from-rk-pin: bool property.
22 - When SSC works in slave mode, according 22 - When SSC works in slave mode, according to the hardware design, the
23 clock can get from TK pin, and also can 23 clock can get from TK pin, and also can get from RK pin. So, add
24 this parameter to choose where the cloc 24 this parameter to choose where the clock from.
25 - By default the clock is from TK pin, if 25 - By default the clock is from TK pin, if the clock from RK pin, this
26 property is needed. 26 property is needed.
27 - #sound-dai-cells: Should contain <0>. 27 - #sound-dai-cells: Should contain <0>.
28 - This property makes the SSC into an aut 28 - This property makes the SSC into an automatically registered DAI.
29 29
30 Examples: 30 Examples:
31 - PDC transfer: 31 - PDC transfer:
32 ssc0: ssc@fffbc000 { 32 ssc0: ssc@fffbc000 {
33 compatible = "atmel,at91rm9200-ssc"; 33 compatible = "atmel,at91rm9200-ssc";
34 reg = <0xfffbc000 0x4000>; 34 reg = <0xfffbc000 0x4000>;
35 interrupts = <14 4 5>; 35 interrupts = <14 4 5>;
36 clocks = <&ssc0_clk>; 36 clocks = <&ssc0_clk>;
37 clock-names = "pclk"; 37 clock-names = "pclk";
38 }; 38 };
39 39
40 - DMA transfer: 40 - DMA transfer:
41 ssc0: ssc@f0010000 { 41 ssc0: ssc@f0010000 {
42 compatible = "atmel,at91sam9g45-ssc"; 42 compatible = "atmel,at91sam9g45-ssc";
43 reg = <0xf0010000 0x4000>; 43 reg = <0xf0010000 0x4000>;
44 interrupts = <28 4 5>; 44 interrupts = <28 4 5>;
45 dmas = <&dma0 1 13>, 45 dmas = <&dma0 1 13>,
46 <&dma0 1 14>; 46 <&dma0 1 14>;
47 dma-names = "tx", "rx"; 47 dma-names = "tx", "rx";
48 pinctrl-names = "default"; 48 pinctrl-names = "default";
49 pinctrl-0 = <&pinctrl_ssc0_tx &pinctrl_s 49 pinctrl-0 = <&pinctrl_ssc0_tx &pinctrl_ssc0_rx>;
50 }; 50 };
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