ASoC: atmel-classd: DT binding for PDMIC 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-pdmic.txt b/Documentation/devicetree/bindings/sound/atmel-pdmic.txt
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+* Atmel PDMIC driver under ALSA SoC architecture
+
+Required properties:
+- compatible
+       Should be "atmel,sama5d2-pdmic".
+- reg
+       Should contain PDMIC registers location and length.
+- interrupts
+       Should contain the IRQ line for the PDMIC.
+- dmas
+       One DMA specifiers as described in atmel-dma.txt and dma.txt files.
+- dma-names
+       Must be "rx".
+- clock-names
+       Required elements:
+       - "pclk"        peripheral clock
+       - "gclk"        generated clock
+- clocks
+       Must contain an entry for each required entry in clock-names.
+       Please refer to clock-bindings.txt.
+- atmel,mic-min-freq
+       The minimal frequency that the micphone supports.
+- atmel,mic-max-freq
+       The maximal frequency that the micphone supports.
+
+Optional properties:
+- pinctrl-names, pinctrl-0
+       Please refer to pinctrl-bindings.txt.
+- atmel,model
+       The user-visible name of this sound card.
+       The default value is "PDMIC".
+- atmel,mic-offset
+       The offset that should be added.
+       The range is from -32768 to 32767.
+       The default value is 0.
+
+Example:
+       pdmic@f8018000 {
+                               compatible = "atmel,sama5d2-pdmic";
+                               reg = <0xf8018000 0x124>;
+                               interrupts = <48 IRQ_TYPE_LEVEL_HIGH 7>;
+                               dmas = <&dma0
+                                       (AT91_XDMAC_DT_MEM_IF(0) | AT91_XDMAC_DT_PER_IF(1)
+                                       | AT91_XDMAC_DT_PERID(50))>;
+                               dma-names = "rx";
+                               clocks = <&pdmic_clk>, <&pdmic_gclk>;
+                               clock-names = "pclk", "gclk";
+
+                               pinctrl-names = "default";
+                               pinctrl-0 = <&pinctrl_pdmic_default>;
+                               atmel,model = "PDMIC @ sama5d2_xplained";
+                               atmel,mic-min-freq = <1000000>;
+                               atmel,mic-max-freq = <3246000>;
+                               atmel,mic-offset = <0x0>;
+       };