snps,dw-wdt.yaml

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    1 # SPDX-License-Identifier: GPL-2.0-only
    2 %YAML 1.2
    3 ---
    4 $id: http://devicetree.org/schemas/watchdog/snps,dw-wdt.yaml#
    5 $schema: http://devicetree.org/meta-schemas/core.yaml#
    6 
    7 title: Synopsys Designware Watchdog Timer
    8 
    9 allOf:
   10   - $ref: "watchdog.yaml#"
   11 
   12 maintainers:
   13   - Jamie Iles <jamie@jamieiles.com>
   14 
   15 properties:
   16   compatible:
   17     oneOf:
   18       - const: snps,dw-wdt
   19       - items:
   20           - enum:
   21               - rockchip,px30-wdt
   22               - rockchip,rk3066-wdt
   23               - rockchip,rk3188-wdt
   24               - rockchip,rk3228-wdt
   25               - rockchip,rk3288-wdt
   26               - rockchip,rk3308-wdt
   27               - rockchip,rk3328-wdt
   28               - rockchip,rk3368-wdt
   29               - rockchip,rk3399-wdt
   30               - rockchip,rk3568-wdt
   31               - rockchip,rv1108-wdt
   32           - const: snps,dw-wdt
   33 
   34   reg:
   35     maxItems: 1
   36 
   37   interrupts:
   38     description: DW Watchdog pre-timeout interrupt
   39     maxItems: 1
   40 
   41   clocks:
   42     minItems: 1
   43     items:
   44       - description: Watchdog timer reference clock
   45       - description: APB3 interface clock
   46 
   47   clock-names:
   48     minItems: 1
   49     items:
   50       - const: tclk
   51       - const: pclk
   52 
   53   resets:
   54     description: Phandle to the DW Watchdog reset lane
   55     maxItems: 1
   56 
   57   snps,watchdog-tops:
   58     $ref: /schemas/types.yaml#/definitions/uint32-array
   59     description: |
   60       DW APB Watchdog custom timer intervals - Timeout Period ranges (TOPs).
   61       Each TOP is a number loaded into the watchdog counter at the moment of
   62       the timer restart. The counter decrementing happens each tick of the
   63       reference clock. Therefore the TOPs array is equivalent to an array of
   64       the timer expiration intervals supported by the DW APB Watchdog. Note
   65       DW APB Watchdog IP-core might be synthesized with fixed TOP values,
   66       in which case this property is unnecessary with default TOPs utilized.
   67     default: [0x0001000 0x0002000 0x0004000 0x0008000
   68       0x0010000 0x0020000 0x0040000 0x0080000
   69       0x0100000 0x0200000 0x0400000 0x0800000
   70       0x1000000 0x2000000 0x4000000 0x8000000]
   71     minItems: 16
   72     maxItems: 16
   73 
   74 unevaluatedProperties: false
   75 
   76 required:
   77   - compatible
   78   - reg
   79   - clocks
   80 
   81 examples:
   82   - |
   83     watchdog@ffd02000 {
   84       compatible = "snps,dw-wdt";
   85       reg = <0xffd02000 0x1000>;
   86       interrupts = <0 171 4>;
   87       clocks = <&per_base_clk>;
   88       resets = <&wdt_rst>;
   89     };
   90 
   91   - |
   92     watchdog@ffd02000 {
   93       compatible = "snps,dw-wdt";
   94       reg = <0xffd02000 0x1000>;
   95       interrupts = <0 171 4>;
   96       clocks = <&per_base_clk>;
   97       clock-names = "tclk";
   98       snps,watchdog-tops = <0x000000FF 0x000001FF 0x000003FF
   99                             0x000007FF 0x0000FFFF 0x0001FFFF
  100                             0x0003FFFF 0x0007FFFF 0x000FFFFF
  101                             0x001FFFFF 0x003FFFFF 0x007FFFFF
  102                             0x00FFFFFF 0x01FFFFFF 0x03FFFFFF
  103                             0x07FFFFFF>;
  104     };
  105 ...

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sys/contrib/device-tree/Bindings/watchdog/snps,dw-wdt.yaml