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/sirf-usp.txt

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    1 * SiRF SoC USP module
    2 
    3 Required properties:
    4 - compatible: "sirf,prima2-usp-pcm"
    5 - reg: Base address and size entries:
    6 - dmas: List of DMA controller phandle and DMA request line ordered pairs.
    7 - dma-names: Identifier string for each DMA request line in the dmas property.
    8   These strings correspond 1:1 with the ordered pairs in dmas.
    9 
   10   One of the DMA channels will be responsible for transmission (should be
   11   named "tx") and one for reception (should be named "rx").
   12 
   13 - clocks: USP controller clock source
   14 - pinctrl-names: Must contain a "default" entry.
   15 - pinctrl-NNN: One property must exist for each entry in pinctrl-names.
   16 
   17 Example:
   18 usp0: usp@b0080000 {
   19         compatible = "sirf,prima2-usp-pcm";
   20         reg = <0xb0080000 0x10000>;
   21         clocks = <&clks 28>;
   22         dmas = <&dmac1 1>, <&dmac1 2>;
   23         dma-names = "rx", "tx";
   24         pinctrl-names = "default";
   25         pinctrl-0 = <&usp0_only_utfs_pins_a>;
   26 };
   27

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