samsung-wdt.yaml

  1# SPDX-License-Identifier: GPL-2.0
  2%YAML 1.2
  3---
  4$id: http://devicetree.org/schemas/watchdog/samsung-wdt.yaml#
  5$schema: http://devicetree.org/meta-schemas/core.yaml#
  6
  7title: Samsung SoC Watchdog Timer Controller
  8
  9maintainers:
 10  - Krzysztof Kozlowski <krzk@kernel.org>
 11
 12description: |+
 13  The Samsung's Watchdog controller is used for resuming system operation
 14  after a preset amount of time during which the WDT reset event has not
 15  occurred.
 16
 17properties:
 18  compatible:
 19    oneOf:
 20      - enum:
 21          - google,gs101-wdt                      # for Google gs101
 22          - samsung,s3c2410-wdt                   # for S3C2410
 23          - samsung,s3c6410-wdt                   # for S3C6410, S5PV210 and Exynos4
 24          - samsung,exynos5250-wdt                # for Exynos5250
 25          - samsung,exynos5420-wdt                # for Exynos5420
 26          - samsung,exynos7-wdt                   # for Exynos7
 27          - samsung,exynos850-wdt                 # for Exynos850
 28          - samsung,exynos990-wdt                 # for Exynos990
 29          - samsung,exynosautov9-wdt              # for Exynosautov9
 30          - samsung,exynosautov920-wdt            # for Exynosautov920
 31      - items:
 32          - enum:
 33              - tesla,fsd-wdt
 34          - const: samsung,exynos7-wdt
 35
 36  reg:
 37    maxItems: 1
 38
 39  clocks:
 40    minItems: 1
 41    maxItems: 2
 42
 43  clock-names:
 44    minItems: 1
 45    maxItems: 2
 46
 47  interrupts:
 48    maxItems: 1
 49
 50  samsung,cluster-index:
 51    $ref: /schemas/types.yaml#/definitions/uint32
 52    description:
 53      Index of CPU cluster on which watchdog is running (in case of Exynos850,
 54      Exynos990 or Google gs101).
 55
 56  samsung,syscon-phandle:
 57    $ref: /schemas/types.yaml#/definitions/phandle
 58    description:
 59      Phandle to the PMU system controller node (in case of Exynos5250,
 60      Exynos5420, Exynos7, Exynos850, Exynos990 and gs101).
 61
 62required:
 63  - compatible
 64  - clocks
 65  - clock-names
 66  - interrupts
 67  - reg
 68
 69allOf:
 70  - $ref: watchdog.yaml#
 71  - if:
 72      properties:
 73        compatible:
 74          contains:
 75            enum:
 76              - google,gs101-wdt
 77              - samsung,exynos5250-wdt
 78              - samsung,exynos5420-wdt
 79              - samsung,exynos7-wdt
 80              - samsung,exynos850-wdt
 81              - samsung,exynos990-wdt
 82              - samsung,exynosautov9-wdt
 83              - samsung,exynosautov920-wdt
 84    then:
 85      required:
 86        - samsung,syscon-phandle
 87  - if:
 88      properties:
 89        compatible:
 90          contains:
 91            enum:
 92              - google,gs101-wdt
 93              - samsung,exynos850-wdt
 94              - samsung,exynos990-wdt
 95              - samsung,exynosautov9-wdt
 96              - samsung,exynosautov920-wdt
 97    then:
 98      properties:
 99        clocks:
100          items:
101            - description: Bus clock, used for register interface
102            - description: Source clock (driving watchdog counter)
103        clock-names:
104          items:
105            - const: watchdog
106            - const: watchdog_src
107        samsung,cluster-index:
108          enum: [0, 1, 2]
109      required:
110        - samsung,cluster-index
111    else:
112      properties:
113        clocks:
114          items:
115            - description: Bus clock, which is also a source clock
116        clock-names:
117          items:
118            - const: watchdog
119        samsung,cluster-index: false
120
121unevaluatedProperties: false
122
123examples:
124  - |
125    watchdog@101d0000 {
126        compatible = "samsung,exynos5250-wdt";
127        reg = <0x101D0000 0x100>;
128        interrupts = <0 42 0>;
129        clocks = <&clock 336>;
130        clock-names = "watchdog";
131        samsung,syscon-phandle = <&pmu_syscon>;
132    };