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,px30-wdt
  22               - rockchip,rk3066-wdt
  23               - rockchip,rk3128-wdt
  24               - rockchip,rk3188-wdt
  25               - rockchip,rk3228-wdt
  26               - rockchip,rk3288-wdt
  27               - rockchip,rk3308-wdt
  28               - rockchip,rk3328-wdt
  29               - rockchip,rk3368-wdt
  30               - rockchip,rk3399-wdt
  31               - rockchip,rk3568-wdt
  32               - rockchip,rk3588-wdt
  33               - rockchip,rv1108-wdt
  34           - const: snps,dw-wdt
  35
  36   reg:
  37     maxItems: 1
  38
  39   interrupts:
  40     description: DW Watchdog pre-timeout interrupt
  41     maxItems: 1
  42
  43   clocks:
  44     minItems: 1
  45     items:
  46       - description: Watchdog timer reference clock
  47       - description: APB3 interface clock
  48
  49   clock-names:
  50     minItems: 1
  51     items:
  52       - const: tclk
  53       - const: pclk
  54
  55   resets:
  56     description: Phandle to the DW Watchdog reset lane
  57     maxItems: 1
  58
  59   snps,watchdog-tops:
  60     $ref: /schemas/types.yaml#/definitions/uint32-array
  61     description: |
  62       DW APB Watchdog custom timer intervals - Timeout Period ranges (TOPs).
  63       Each TOP is a number loaded into the watchdog counter at the moment of
  64       the timer restart. The counter decrementing happens each tick of the
  65       reference clock. Therefore the TOPs array is equivalent to an array of
  66       the timer expiration intervals supported by the DW APB Watchdog. Note
  67       DW APB Watchdog IP-core might be synthesized with fixed TOP values,
  68       in which case this property is unnecessary with default TOPs utilized.
  69     default: [0x0001000 0x0002000 0x0004000 0x0008000
  70       0x0010000 0x0020000 0x0040000 0x0080000
  71       0x0100000 0x0200000 0x0400000 0x0800000
  72       0x1000000 0x2000000 0x4000000 0x8000000]
  73     minItems: 16
  74     maxItems: 16
  75
  76 unevaluatedProperties: false
  77
  78 required:
  79   - compatible
  80   - reg
  81   - clocks
  82
  83 examples:
  84   - |
  85     watchdog@ffd02000 {
  86         compatible = "snps,dw-wdt";
  87         reg = <0xffd02000 0x1000>;
  88         interrupts = <0 171 4>;
  89         clocks = <&per_base_clk>;
  90         resets = <&wdt_rst>;
  91     };
  92
  93   - |
  94     watchdog@ffd02000 {
  95         compatible = "snps,dw-wdt";
  96         reg = <0xffd02000 0x1000>;
  97         interrupts = <0 171 4>;
  98         clocks = <&per_base_clk>;
  99         clock-names = "tclk";
 100         snps,watchdog-tops = <0x000000FF 0x000001FF 0x000003FF
 101                               0x000007FF 0x0000FFFF 0x0001FFFF
 102                               0x0003FFFF 0x0007FFFF 0x000FFFFF
 103                               0x001FFFFF 0x003FFFFF 0x007FFFFF
 104                               0x00FFFFFF 0x01FFFFFF 0x03FFFFFF
 105                               0x07FFFFFF>;
 106     };
 107 ...