1 # SPDX-License-Identifier: (GPL-2.0-only OR BS
2 %YAML 1.2
3 ---
4 $id: http://devicetree.org/schemas/watchdog/as
5 $schema: http://devicetree.org/meta-schemas/co
6
7 title: Aspeed watchdog timer controllers
8
9 maintainers:
10 - Andrew Jeffery <andrew@codeconstruct.com.au
11
12 properties:
13 compatible:
14 enum:
15 - aspeed,ast2400-wdt
16 - aspeed,ast2500-wdt
17 - aspeed,ast2600-wdt
18
19 reg:
20 maxItems: 1
21
22 clocks:
23 maxItems: 1
24 description: >
25 The clock used to drive the watchdog cou
26 other than the 1MHz clock can be selecte
27 optional.
28
29 aspeed,reset-type:
30 $ref: /schemas/types.yaml#/definitions/str
31 enum:
32 - cpu
33 - soc
34 - system
35 - none
36 default: system
37 description: >
38 The watchdog can be programmed to genera
39 reset when a timeout occcurs.
40
41 Specifying 'cpu' will only reset the pro
42
43 Specifying 'soc' will reset a configurab
44 on a timeout event. Controllers critical
45 untouched. The set of SoC controllers to
46 aspeed,reset-mask property if the node h
47 aspeed,ast2600-wdt compatible.
48
49 Specifying 'system' will reset all contr
50 EXTRST had been asserted.
51
52 Specifying 'none' will cause the timeout
53 Another watchdog engine on the chip must
54
55 aspeed,alt-boot:
56 $ref: /schemas/types.yaml#/definitions/fla
57 description: >
58 Direct the watchdog to configure the SoC
59 region if a timeout occurs.
60
61 aspeed,external-signal:
62 $ref: /schemas/types.yaml#/definitions/fla
63 description: >
64 Assert the timeout event on an external
65 watchdog controller instance. The pin mu
66
67 aspeed,ext-pulse-duration:
68 $ref: /schemas/types.yaml#/definitions/uin
69 description: >
70 The duration, in microseconds, of the pu
71 pin.
72
73 aspeed,ext-push-pull:
74 $ref: /schemas/types.yaml#/definitions/fla
75 description: >
76 If aspeed,external-signal is specified i
77 signal pin's drive type to push-pull. If
78 specified then the pin is configured as
79
80 aspeed,ext-active-high:
81 $ref: /schemas/types.yaml#/definitions/fla
82 description: >
83 If both aspeed,external-signal and aspee
84 the node, set the pulse polarity to acti
85 is not specified then the pin is configu
86
87 aspeed,reset-mask:
88 $ref: /schemas/types.yaml#/definitions/uin
89 minItems: 1
90 maxItems: 2
91 description: >
92 A bitmask indicating which peripherals w
93 timer expires. On AST2500 SoCs this shou
94 the AST2500_WDT_RESET_* macros; on AST26
95 array with the first word defined using
96 and the second word defined using the AS
97
98 required:
99 - compatible
100 - reg
101
102 allOf:
103 - if:
104 anyOf:
105 - required:
106 - aspeed,ext-push-pull
107 - required:
108 - aspeed,ext-active-high
109 - required:
110 - aspeed,reset-mask
111 then:
112 properties:
113 compatible:
114 enum:
115 - aspeed,ast2500-wdt
116 - aspeed,ast2600-wdt
117 - if:
118 required:
119 - aspeed,ext-active-high
120 then:
121 required:
122 - aspeed,ext-push-pull
123
124 additionalProperties: false
125
126 examples:
127 - |
128 watchdog@1e785000 {
129 compatible = "aspeed,ast2400-wdt";
130 reg = <0x1e785000 0x1c>;
131 aspeed,reset-type = "system";
132 aspeed,external-signal;
133 };
134 - |
135 #include <dt-bindings/watchdog/aspeed-wdt.
136 watchdog@1e785040 {
137 compatible = "aspeed,ast2600-wdt";
138 reg = <0x1e785040 0x40>;
139 aspeed,reset-type = "soc";
140 aspeed,reset-mask = <AST2600_WDT_RESET
141 (AST2600_WDT_RESET
142 };
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