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# Copyright 2022 The ChromiumOS Authors
# Use of this source code is governed by a BSD-style license that can be
# found in the LICENSE file.
description: |
Power Signal Emulator Node
Power signal emulator allows executing AP Power Sequence in a virtual
environment by simulating power signals behavior.
This file defines a node to bind two or more power signals. A node connects
one input-signal with one or more output-signals. When a node is loaded and
initialized by power signal emulator, its input-signal state will control
the value of its children output-signals. Behavior of output-signals are
configurable to meet AP power sequence test cases.
Power Signals direction is determined from emulator node perspective. An input
signal in a node, is the one to be monitored by the emulator, while an output
signal gets its value altered when corresponding input signal's state changes.
compatible: "intel,ap-pwr-signal-emul"
properties:
input-signal:
type: phandle
required: true
description: |
Input signal whose value is monitored to control children output-signal`s
value.
assert-value:
type: int
required: false
default: 1
description: |
Value that indicates `input-signal` must be ASSERTED.
A power signal state can be ASSERTED or DEASSERTED.`input-signal` is only
considered asserted if its new value is equal to `assert-value`, any
other value makes it deasserted.
edge:
type: string
required: false
description: |
Controls when to trigger children value change, based on `input-signal`
new state.
EDGE_ACTIVE_ON_ASSERT: Children value changes only when `input-signal`
state changes into asserted.
EDGE_ACTIVE_ON_DEASSERT: Children value changes only when `input-signal`
state changes into deasserted.
EDGE_ACTIVE_ON_DEASSERT: Children value changes everytime `input-signal`
state changes.
default: EDGE_ACTIVE_ON_BOTH
enum:
- EDGE_ACTIVE_ON_ASSERT
- EDGE_ACTIVE_ON_DEASSERT
- EDGE_ACTIVE_ON_BOTH
init-value:
type: int
required: false
description: |
Initial value of `input-signal`.
child-binding:
description: |
Child power signals configuration.
properties:
output-signal:
type: phandle
required: true
description: |
Output signal whose value will be controlled by parent `input-signal`
state.
assert-value:
type: int
required: false
default: 1
description: |
Value that will be assigned to this signal when parent `input-signal`
state is asserted.
assert-delay-ms:
type: int
required: false
default: 10
description: |
Milliseconds to delay setting this signal to its `assert-value`
after `input-signal` is asserted.
deassert-value:
type: int
required: false
default: 0
description: |
Value that will be assigned to this signal when parent `input-signal`
state is deasserted.
deassert-delay-ms:
type: int
required: false
default: 10
description: |
Milliseconds to delay setting this signal to its `deassert-value`
after `input-signal` is deasserted.
init-value:
type: int
required: false
description: |
Value set to this power signal when initializing this node.
invert-value:
type: boolean
description: |
Invert this power signal assertion logic, this applies to both values
and delays.
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