atmel-classd.txt

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    1 * Atmel ClassD driver under ALSA SoC architecture
    2 
    3 Required properties:
    4 - compatible
    5         Should be "atmel,sama5d2-classd".
    6 - reg
    7         Should contain ClassD registers location and length.
    8 - interrupts
    9         Should contain the IRQ line for the ClassD.
   10 - dmas
   11         One DMA specifiers as described in atmel-dma.txt and dma.txt files.
   12 - dma-names
   13         Must be "tx".
   14 - clock-names
   15         Tuple listing input clock names.
   16         Required elements: "pclk" and "gclk".
   17 - clocks
   18         Please refer to clock-bindings.txt.
   19 - assigned-clocks
   20         Should be <&classd_gclk>.
   21 
   22 Optional properties:
   23 - pinctrl-names, pinctrl-0
   24         Please refer to pinctrl-bindings.txt.
   25 - atmel,model
   26         The user-visible name of this sound complex.
   27         The default value is "CLASSD".
   28 - atmel,pwm-type
   29         PWM modulation type, "single" or "diff".
   30         The default value is "single".
   31 - atmel,non-overlap-time
   32         Set non-overlapping time, the unit is nanosecond(ns).
   33         There are four values,
   34         <5>, <10>, <15>, <20>, the default value is <10>.
   35         Non-overlapping will be disabled if not specified.
   36 
   37 Example:
   38 classd: classd@fc048000 {
   39                 compatible = "atmel,sama5d2-classd";
   40                 reg = <0xfc048000 0x100>;
   41                 interrupts = <59 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(47))>;
   45                 dma-names = "tx";
   46                 clocks = <&classd_clk>, <&classd_gclk>;
   47                 clock-names = "pclk", "gclk";
   48                 assigned-clocks = <&classd_gclk>;
   49 
   50                 pinctrl-names = "default";
   51                 pinctrl-0 = <&pinctrl_classd_default>;
   52                 atmel,model = "classd @ SAMA5D2-Xplained";
   53                 atmel,pwm-type = "diff";
   54                 atmel,non-overlap-time = <10>;
   55 };

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