ASoC: atmel-classd: DT binding for Class D audio amplifier driver

DT binding documentation for this new ASoC driver.

Signed-off-by: Songjun Wu <songjun.wu@atmel.com>
Signed-off-by: Mark Brown <broonie@kernel.org>

diff --git a/Documentation/devicetree/bindings/sound/atmel-classd.txt b/Documentation/devicetree/bindings/sound/atmel-classd.txt
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+* Atmel ClassD driver under ALSA SoC architecture
+
+Required properties:
+- compatible
+       Should be "atmel,sama5d2-classd".
+- reg
+       Should contain ClassD registers location and length.
+- interrupts
+       Should contain the IRQ line for the ClassD.
+- dmas
+       One DMA specifiers as described in atmel-dma.txt and dma.txt files.
+- dma-names
+       Must be "tx".
+- clock-names
+       Tuple listing input clock names.
+       Required elements: "pclk", "gclk" and "aclk".
+- clocks
+       Please refer to clock-bindings.txt.
+
+Optional properties:
+- pinctrl-names, pinctrl-0
+       Please refer to pinctrl-bindings.txt.
+- atmel,model
+       The user-visible name of this sound complex.
+       The default value is "CLASSD".
+- atmel,pwm-type
+       PWM modulation type, "single" or "diff".
+       The default value is "single".
+- atmel,non-overlap-time
+       Set non-overlapping time, the unit is nanosecond(ns).
+       There are four values,
+       <5>, <10>, <15>, <20>, the default value is <10>.
+       Non-overlapping will be disabled if not specified.
+
+Example:
+classd: classd@fc048000 {
+               compatible = "atmel,sama5d2-classd";
+               reg = <0xfc048000 0x100>;
+               interrupts = <59 IRQ_TYPE_LEVEL_HIGH 7>;
+               dmas = <&dma0
+                       (AT91_XDMAC_DT_MEM_IF(0) | AT91_XDMAC_DT_PER_IF(1)
+                       | AT91_XDMAC_DT_PERID(47))>;
+               dma-names = "tx";
+               clocks = <&classd_clk>, <&classd_gclk>, <&audio_pll_pmc>;
+               clock-names = "pclk", "gclk", "aclk";
+
+               pinctrl-names = "default";
+               pinctrl-0 = <&pinctrl_classd_default>;
+               atmel,model = "classd @ SAMA5D2-Xplained";
+               atmel,pwm-type = "diff";
+               atmel,non-overlap-time = <10>;
+};