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drivers: adc: voltage divider

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adds DT macro initializer and scaling function for voltage divider.

Signed-off-by: Jason Yuan <jasonyuan@google.com>
This commit is contained in:
Jason Yuan 2023-03-15 14:06:47 -07:00 • committed by Carles Cufí
commit 67bdd17808
2 changed files with 59 additions and 0 deletions
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dts/bindings/adc/voltage-divider.yaml
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# Copyright (c) 2019, Peter Bigot Consulting, LLC
# SPDX-License-Identifier: Apache-2.0
description: |
Description for a voltage divider, with optional ability to measure
resistance of the upper leg.
compatible: "voltage-divider"
include: base.yaml
properties:
io-channels:
required: true
description: |
Channels available with this divider configuration.
output-ohms:
type: int
required: true
description: |
Resistance of the lower leg of the voltage divider
full-ohms:
type: int
description: |
Resistance of the full path through the voltage divider.
If absent or zero the driver assumes that the upper leg is a
resistance-based sensor.
power-gpios:
type: phandle-array
description: |
Control power to the voltage divider inputs.
If present the corresponding GPIO must be set to an active level
to enable the divider input.