| Tom Rini | 53633a8 | 2024-02-29 12:33:36 -0500 | [diff] [blame] | 1 | # SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause) |
| 2 | # Copyright (C) 2022 Microchip Technology, Inc. and its subsidiaries |
| 3 | %YAML 1.2 |
| 4 | --- |
| 5 | $id: http://devicetree.org/schemas/watchdog/atmel,at91sam9-wdt.yaml# |
| 6 | $schema: http://devicetree.org/meta-schemas/core.yaml# |
| 7 | |
| 8 | title: Atmel Watchdog Timers |
| 9 | |
| 10 | maintainers: |
| 11 | - Eugen Hristev <eugen.hristev@microchip.com> |
| 12 | |
| 13 | properties: |
| 14 | compatible: |
| 15 | const: atmel,at91sam9260-wdt |
| 16 | |
| 17 | reg: |
| 18 | maxItems: 1 |
| 19 | |
| 20 | clocks: |
| 21 | maxItems: 1 |
| 22 | |
| 23 | interrupts: |
| 24 | maxItems: 1 |
| 25 | |
| 26 | atmel,max-heartbeat-sec: |
| 27 | description: |
| 28 | Should contain the maximum heartbeat value in seconds. This value |
| 29 | should be less or equal to 16. It is used to compute the WDV field. |
| 30 | maximum: 16 |
| 31 | |
| 32 | atmel,min-heartbeat-sec: |
| 33 | description: |
| 34 | Should contain the minimum heartbeat value in seconds. This value |
| 35 | must be smaller than the max-heartbeat-sec value. It is used to |
| 36 | compute the WDD field. |
| 37 | maximum: 16 |
| 38 | |
| 39 | atmel,watchdog-type: |
| 40 | $ref: /schemas/types.yaml#/definitions/string |
| 41 | description: | |
| 42 | Should be hardware or software. |
| 43 | oneOf: |
| 44 | - description: |
| 45 | Hardware watchdog uses the at91 watchdog reset. |
| 46 | const: hardware |
| 47 | - description: | |
| 48 | Software watchdog uses the watchdog interrupt |
| 49 | to trigger a software reset. |
| 50 | const: software |
| 51 | default: hardware |
| 52 | |
| 53 | atmel,reset-type: |
| 54 | $ref: /schemas/types.yaml#/definitions/string |
| 55 | description: | |
| 56 | Should be proc or all. This is valid only when using hardware watchdog. |
| 57 | oneOf: |
| 58 | - description: |
| 59 | Assert peripherals and processor reset signals. |
| 60 | const: all |
| 61 | - description: |
| 62 | Assert the processor reset signal. |
| 63 | const: proc |
| 64 | default: all |
| 65 | |
| 66 | atmel,disable: |
| 67 | $ref: /schemas/types.yaml#/definitions/flag |
| 68 | description: |
| 69 | Should be present if you want to stop the watchdog. |
| 70 | |
| 71 | atmel,idle-halt: |
| 72 | $ref: /schemas/types.yaml#/definitions/flag |
| 73 | description: | |
| 74 | Should be present if you want to stop the watchdog when |
| 75 | entering idle state. |
| 76 | CAUTION: This property should be used with care, it actually makes the |
| 77 | watchdog not counting when the CPU is in idle state, therefore the |
| 78 | watchdog reset time depends on mean CPU usage and will not reset at all |
| 79 | if the CPU stops working while it is in idle state, which is probably |
| 80 | not what you want. |
| 81 | |
| 82 | atmel,dbg-halt: |
| 83 | $ref: /schemas/types.yaml#/definitions/flag |
| 84 | description: | |
| 85 | Should be present if you want to stop the watchdog when |
| 86 | entering debug state. |
| 87 | |
| 88 | required: |
| 89 | - compatible |
| 90 | - reg |
| 91 | - clocks |
| 92 | |
| 93 | allOf: |
| 94 | - $ref: watchdog.yaml# |
| 95 | - if: |
| 96 | properties: |
| 97 | atmel,reset-type: |
| 98 | enum: |
| 99 | - all |
| 100 | - proc |
| 101 | then: |
| 102 | properties: |
| 103 | atmel,watchdog-type: |
| 104 | const: hardware |
| 105 | |
| 106 | dependencies: |
| 107 | atmel,reset-type: ['atmel,watchdog-type'] |
| 108 | |
| 109 | unevaluatedProperties: false |
| 110 | |
| 111 | examples: |
| 112 | - | |
| 113 | #include <dt-bindings/interrupt-controller/irq.h> |
| 114 | |
| 115 | watchdog@fffffd40 { |
| 116 | compatible = "atmel,at91sam9260-wdt"; |
| 117 | reg = <0xfffffd40 0x10>; |
| 118 | interrupts = <1 IRQ_TYPE_LEVEL_HIGH 7>; |
| 119 | clocks = <&clk32k>; |
| 120 | timeout-sec = <15>; |
| 121 | atmel,watchdog-type = "hardware"; |
| 122 | atmel,reset-type = "all"; |
| 123 | atmel,dbg-halt; |
| 124 | atmel,idle-halt; |
| 125 | atmel,max-heartbeat-sec = <16>; |
| 126 | atmel,min-heartbeat-sec = <0>; |
| 127 | }; |