The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)

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FreeBSD/Linux Kernel Cross Reference
sys/contrib/device-tree/Bindings/sound/amlogic,axg-pdm.txt

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    1 * Amlogic Audio PDM input
    2 
    3 Required properties:
    4 - compatible: 'amlogic,axg-pdm' or
    5               'amlogic,g12a-pdm' or
    6               'amlogic,sm1-pdm'
    7 - reg: physical base address of the controller and length of memory
    8        mapped region.
    9 - clocks: list of clock phandle, one for each entry clock-names.
   10 - clock-names: should contain the following:
   11   * "pclk"   : peripheral clock.
   12   * "dclk"   : pdm digital clock
   13   * "sysclk" : dsp system clock
   14 - #sound-dai-cells: must be 0.
   15 
   16 Optional property:
   17 - resets: phandle to the dedicated reset line of the pdm input.
   18 
   19 Example of PDM on the A113 SoC:
   20 
   21 pdm: audio-controller@ff632000 {
   22         compatible = "amlogic,axg-pdm";
   23         reg = <0x0 0xff632000 0x0 0x34>;
   24         #sound-dai-cells = <0>;
   25         clocks = <&clkc_audio AUD_CLKID_PDM>,
   26                  <&clkc_audio AUD_CLKID_PDM_DCLK>,
   27                  <&clkc_audio AUD_CLKID_PDM_SYSCLK>;
   28         clock-names = "pclk", "dclk", "sysclk";
   29 };

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