Documentation/devicetree/bindings/watchdog/snps,dw-wdt.yaml

   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,rk3066-wdt
  22               - rockchip,rk3188-wdt
  23               - rockchip,rk3288-wdt
  24               - rockchip,rk3368-wdt
  25           - const: snps,dw-wdt
  26
  27   reg:
  28     maxItems: 1
  29
  30   interrupts:
  31     description: DW Watchdog pre-timeout interrupt
  32     maxItems: 1
  33
  34   clocks:
  35     minItems: 1
  36     items:
  37       - description: Watchdog timer reference clock
  38       - description: APB3 interface clock
  39
  40   clock-names:
  41     minItems: 1
  42     items:
  43       - const: tclk
  44       - const: pclk
  45
  46   resets:
  47     description: Phandle to the DW Watchdog reset lane
  48     maxItems: 1
  49
  50   snps,watchdog-tops:
  51     $ref: /schemas/types.yaml#/definitions/uint32-array
  52     description: |
  53       DW APB Watchdog custom timer intervals - Timeout Period ranges (TOPs).
  54       Each TOP is a number loaded into the watchdog counter at the moment of
  55       the timer restart. The counter decrementing happens each tick of the
  56       reference clock. Therefore the TOPs array is equivalent to an array of
  57       the timer expiration intervals supported by the DW APB Watchdog. Note
  58       DW APB Watchdog IP-core might be synthesized with fixed TOP values,
  59       in which case this property is unnecessary with default TOPs utilized.
  60     default: [0x0001000 0x0002000 0x0004000 0x0008000
  61       0x0010000 0x0020000 0x0040000 0x0080000
  62       0x0100000 0x0200000 0x0400000 0x0800000
  63       0x1000000 0x2000000 0x4000000 0x8000000]
  64     minItems: 16
  65     maxItems: 16
  66
  67 unevaluatedProperties: false
  68
  69 required:
  70   - compatible
  71   - reg
  72   - clocks
  73
  74 examples:
  75   - |
  76     watchdog@ffd02000 {
  77       compatible = "snps,dw-wdt";
  78       reg = <0xffd02000 0x1000>;
  79       interrupts = <0 171 4>;
  80       clocks = <&per_base_clk>;
  81       resets = <&wdt_rst>;
  82     };
  83
  84   - |
  85     watchdog@ffd02000 {
  86       compatible = "snps,dw-wdt";
  87       reg = <0xffd02000 0x1000>;
  88       interrupts = <0 171 4>;
  89       clocks = <&per_base_clk>;
  90       clock-names = "tclk";
  91       snps,watchdog-tops = <0x000000FF 0x000001FF 0x000003FF
  92                             0x000007FF 0x0000FFFF 0x0001FFFF
  93                             0x0003FFFF 0x0007FFFF 0x000FFFFF
  94                             0x001FFFFF 0x003FFFFF 0x007FFFFF
  95                             0x00FFFFFF 0x01FFFFFF 0x03FFFFFF
  96                             0x07FFFFFF>;
  97     };
  98 ...