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/soc/bcm/brcm,bcm2835-pm.txt

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    1 BCM2835 PM (Power domains, watchdog)
    2 
    3 The PM block controls power domains and some reset lines, and includes
    4 a watchdog timer.  This binding supersedes the brcm,bcm2835-pm-wdt
    5 binding which covered some of PM's register range and functionality.
    6 
    7 Required properties:
    8 
    9 - compatible:           Should be "brcm,bcm2835-pm"
   10 - reg:                  Specifies base physical address and size of the two
   11                           register ranges ("PM" and "ASYNC_BRIDGE" in that
   12                           order)
   13 - clocks:               a) v3d: The V3D clock from CPRMAN
   14                         b) peri_image: The PERI_IMAGE clock from CPRMAN
   15                         c) h264: The H264 clock from CPRMAN
   16                         d) isp: The ISP clock from CPRMAN
   17 - #reset-cells:         Should be 1.  This property follows the reset controller
   18                           bindings[1].
   19 - #power-domain-cells:  Should be 1.  This property follows the power domain
   20                           bindings[2].
   21 
   22 Optional properties:
   23 
   24 - timeout-sec:          Contains the watchdog timeout in seconds
   25 - system-power-controller: Whether the watchdog is controlling the
   26     system power.  This node follows the power controller bindings[3].
   27 
   28 [1] Documentation/devicetree/bindings/reset/reset.txt
   29 [2] Documentation/devicetree/bindings/power/power-domain.yaml
   30 [3] Documentation/devicetree/bindings/power/power-controller.txt
   31 
   32 Example:
   33 
   34 pm {
   35         compatible = "brcm,bcm2835-pm", "brcm,bcm2835-pm-wdt";
   36         #power-domain-cells = <1>;
   37         #reset-cells = <1>;
   38         reg = <0x7e100000 0x114>,
   39               <0x7e00a000 0x24>;
   40         clocks = <&clocks BCM2835_CLOCK_V3D>,
   41                  <&clocks BCM2835_CLOCK_PERI_IMAGE>,
   42                  <&clocks BCM2835_CLOCK_H264>,
   43                  <&clocks BCM2835_CLOCK_ISP>;
   44         clock-names = "v3d", "peri_image", "h264", "isp";
   45         system-power-controller;
   46 };

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