summaryrefslogtreecommitdiffstats
path: root/kernel/Documentation/devicetree/bindings/misc/atmel-ssc.txt
diff options
context:
space:
mode:
Diffstat (limited to 'kernel/Documentation/devicetree/bindings/misc/atmel-ssc.txt')
-rw-r--r--kernel/Documentation/devicetree/bindings/misc/atmel-ssc.txt49
1 files changed, 49 insertions, 0 deletions
diff --git a/kernel/Documentation/devicetree/bindings/misc/atmel-ssc.txt b/kernel/Documentation/devicetree/bindings/misc/atmel-ssc.txt
new file mode 100644
index 000000000..efc98ea1f
--- /dev/null
+++ b/kernel/Documentation/devicetree/bindings/misc/atmel-ssc.txt
@@ -0,0 +1,49 @@
+* 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";
+};