atmel-pdmic.txt

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    1 * Atmel PDMIC driver under ALSA SoC architecture
    2 
    3 Required properties:
    4 - compatible
    5         Should be "atmel,sama5d2-pdmic".
    6 - reg
    7         Should contain PDMIC registers location and length.
    8 - interrupts
    9         Should contain the IRQ line for the PDMIC.
   10 - dmas
   11         One DMA specifiers as described in atmel-dma.txt and dma.txt files.
   12 - dma-names
   13         Must be "rx".
   14 - clock-names
   15         Required elements:
   16         - "pclk"        peripheral clock
   17         - "gclk"        generated clock
   18 - clocks
   19         Must contain an entry for each required entry in clock-names.
   20         Please refer to clock-bindings.txt.
   21 - atmel,mic-min-freq
   22         The minimal frequency that the micphone supports.
   23 - atmel,mic-max-freq
   24         The maximal frequency that the micphone supports.
   25 
   26 Optional properties:
   27 - pinctrl-names, pinctrl-0
   28         Please refer to pinctrl-bindings.txt.
   29 - atmel,model
   30         The user-visible name of this sound card.
   31         The default value is "PDMIC".
   32 - atmel,mic-offset
   33         The offset that should be added.
   34         The range is from -32768 to 32767.
   35         The default value is 0.
   36 
   37 Example:
   38         pdmic@f8018000 {
   39                                 compatible = "atmel,sama5d2-pdmic";
   40                                 reg = <0xf8018000 0x124>;
   41                                 interrupts = <48 IRQ_TYPE_LEVEL_HIGH 7>;
   42                                 dmas = <&dma0
   43                                         (AT91_XDMAC_DT_MEM_IF(0) | AT91_XDMAC_DT_PER_IF(1)
   44                                         | AT91_XDMAC_DT_PERID(50))>;
   45                                 dma-names = "rx";
   46                                 clocks = <&pdmic_clk>, <&pdmic_gclk>;
   47                                 clock-names = "pclk", "gclk";
   48 
   49                                 pinctrl-names = "default";
   50                                 pinctrl-0 = <&pinctrl_pdmic_default>;
   51                                 atmel,model = "PDMIC @ sama5d2_xplained";
   52                                 atmel,mic-min-freq = <1000000>;
   53                                 atmel,mic-max-freq = <3246000>;
   54                                 atmel,mic-offset = <0x0>;
   55         };

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sys/contrib/device-tree/Bindings/sound/atmel-pdmic.txt