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authorDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-27 10:05:51 +0000
committerDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-27 10:05:51 +0000
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treea94efe259b9009378be6d90eb30d2b019d95c194 /Documentation/devicetree/bindings/misc/atmel-ssc.txt
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+* 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.
+ - #sound-dai-cells: Should contain <0>.
+ - This property makes the SSC into an automatically registered DAI.
+
+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>;
+};