143 lines
4.3 KiB
YAML
143 lines
4.3 KiB
YAML
|
# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
|
||
|
|
%YAML 1.2
|
||
|
|
---
|
||
|
|
$id: http://devicetree.org/schemas/watchdog/aspeed,ast2400-wdt.yaml#
|
||
|
|
$schema: http://devicetree.org/meta-schemas/core.yaml#
|
||
|
|
|
||
|
|
title: Aspeed watchdog timer controllers
|
||
|
|
|
||
|
|
maintainers:
|
||
|
|
- Andrew Jeffery <andrew@codeconstruct.com.au>
|
||
|
|
|
||
|
|
properties:
|
||
|
|
compatible:
|
||
|
|
enum:
|
||
|
|
- aspeed,ast2400-wdt
|
||
|
|
- aspeed,ast2500-wdt
|
||
|
|
- aspeed,ast2600-wdt
|
||
|
|
|
||
|
|
reg:
|
||
|
|
maxItems: 1
|
||
|
|
|
||
|
|
clocks:
|
||
|
|
maxItems: 1
|
||
|
|
description: >
|
||
|
|
The clock used to drive the watchdog counter. From the AST2500 no source
|
||
|
|
other than the 1MHz clock can be selected, so the clocks property is
|
||
|
|
optional.
|
||
|
|
|
||
|
|
aspeed,reset-type:
|
||
|
|
$ref: /schemas/types.yaml#/definitions/string
|
||
|
|
enum:
|
||
|
|
- cpu
|
||
|
|
- soc
|
||
|
|
- system
|
||
|
|
- none
|
||
|
|
default: system
|
||
|
|
description: >
|
||
|
|
The watchdog can be programmed to generate one of three different types of
|
||
|
|
reset when a timeout occcurs.
|
||
|
|
|
||
|
|
Specifying 'cpu' will only reset the processor on a timeout event.
|
||
|
|
|
||
|
|
Specifying 'soc' will reset a configurable subset of the SoC's controllers
|
||
|
|
on a timeout event. Controllers critical to the SoC's operation may remain
|
||
|
|
untouched. The set of SoC controllers to reset may be specified via the
|
||
|
|
aspeed,reset-mask property if the node has the aspeed,ast2500-wdt or
|
||
|
|
aspeed,ast2600-wdt compatible.
|
||
|
|
|
||
|
|
Specifying 'system' will reset all controllers on a timeout event, as if
|
||
|
|
EXTRST had been asserted.
|
||
|
|
|
||
|
|
Specifying 'none' will cause the timeout event to have no reset effect.
|
||
|
|
Another watchdog engine on the chip must be used for chip reset operations.
|
||
|
|
|
||
|
|
aspeed,alt-boot:
|
||
|
|
$ref: /schemas/types.yaml#/definitions/flag
|
||
|
|
description: >
|
||
|
|
Direct the watchdog to configure the SoC to boot from the alternative boot
|
||
|
|
region if a timeout occurs.
|
||
|
|
|
||
|
|
aspeed,external-signal:
|
||
|
|
$ref: /schemas/types.yaml#/definitions/flag
|
||
|
|
description: >
|
||
|
|
Assert the timeout event on an external signal pin associated with the
|
||
|
|
watchdog controller instance. The pin must be muxed appropriately.
|
||
|
|
|
||
|
|
aspeed,ext-pulse-duration:
|
||
|
|
$ref: /schemas/types.yaml#/definitions/uint32
|
||
|
|
description: >
|
||
|
|
The duration, in microseconds, of the pulse emitted on the external signal
|
||
|
|
pin.
|
||
|
|
|
||
|
|
aspeed,ext-push-pull:
|
||
|
|
$ref: /schemas/types.yaml#/definitions/flag
|
||
|
|
description: >
|
||
|
|
If aspeed,external-signal is specified in the node, set the external
|
||
|
|
signal pin's drive type to push-pull. If aspeed,ext-push-pull is not
|
||
|
|
specified then the pin is configured as open-drain.
|
||
|
|
|
||
|
|
aspeed,ext-active-high:
|
||
|
|
$ref: /schemas/types.yaml#/definitions/flag
|
||
|
|
description: >
|
||
|
|
If both aspeed,external-signal and aspeed,ext-push-pull are specified in
|
||
|
|
the node, set the pulse polarity to active-high. If aspeed,ext-active-high
|
||
|
|
is not specified then the pin is configured as active-low.
|
||
|
|
|
||
|
|
aspeed,reset-mask:
|
||
|
|
$ref: /schemas/types.yaml#/definitions/uint32-array
|
||
|
|
minItems: 1
|
||
|
|
maxItems: 2
|
||
|
|
description: >
|
||
|
|
A bitmask indicating which peripherals will be reset if the watchdog
|
||
|
|
timer expires. On AST2500 SoCs this should be a single word defined using
|
||
|
|
the AST2500_WDT_RESET_* macros; on AST2600 SoCs this should be a two-word
|
||
|
|
array with the first word defined using the AST2600_WDT_RESET1_* macros,
|
||
|
|
and the second word defined using the AST2600_WDT_RESET2_* macros.
|
||
|
|
|
||
|
|
required:
|
||
|
|
- compatible
|
||
|
|
- reg
|
||
|
|
|
||
|
|
allOf:
|
||
|
|
- if:
|
||
|
|
anyOf:
|
||
|
|
- required:
|
||
|
|
- aspeed,ext-push-pull
|
||
|
|
- required:
|
||
|
|
- aspeed,ext-active-high
|
||
|
|
- required:
|
||
|
|
- aspeed,reset-mask
|
||
|
|
then:
|
||
|
|
properties:
|
||
|
|
compatible:
|
||
|
|
enum:
|
||
|
|
- aspeed,ast2500-wdt
|
||
|
|
- aspeed,ast2600-wdt
|
||
|
|
- if:
|
||
|
|
required:
|
||
|
|
- aspeed,ext-active-high
|
||
|
|
then:
|
||
|
|
required:
|
||
|
|
- aspeed,ext-push-pull
|
||
|
|
|
||
|
|
additionalProperties: false
|
||
|
|
|
||
|
|
examples:
|
||
|
|
- |
|
||
|
|
watchdog@1e785000 {
|
||
|
|
compatible = "aspeed,ast2400-wdt";
|
||
|
|
reg = <0x1e785000 0x1c>;
|
||
|
|
aspeed,reset-type = "system";
|
||
|
|
aspeed,external-signal;
|
||
|
|
};
|
||
|
|
- |
|
||
|
|
#include <dt-bindings/watchdog/aspeed-wdt.h>
|
||
|
|
watchdog@1e785040 {
|
||
|
|
compatible = "aspeed,ast2600-wdt";
|
||
|
|
reg = <0x1e785040 0x40>;
|
||
|
|
aspeed,reset-type = "soc";
|
||
|
|
aspeed,reset-mask = <AST2600_WDT_RESET1_DEFAULT
|
||
|
|
(AST2600_WDT_RESET2_DEFAULT & ~AST2600_WDT_RESET2_LPC)>;
|
||
|
|
};
|