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|
# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
%YAML 1.2
---
$id: http://devicetree.org/schemas/iio/adc/ti,ads131e08.yaml#
$schema: http://devicetree.org/meta-schemas/core.yaml#
title: Texas Instruments ADS131E0x 4-, 6- and 8-Channel ADCs
maintainers:
- Jonathan Cameron <jic23@kernel.org>
description: |
The ADS131E0x are a family of multichannel, simultaneous sampling,
24-bit, delta-sigma, analog-to-digital converters (ADCs) with a
built-in programmable gain amplifier (PGA), internal reference
and an onboard oscillator.
The communication with ADC chip is via the SPI bus (mode 1).
https://www.ti.com/lit/ds/symlink/ads131e08.pdf
properties:
compatible:
enum:
- ti,ads131e04
- ti,ads131e06
- ti,ads131e08
reg:
maxItems: 1
spi-cpha: true
clocks:
description: |
Device tree identifier to the clock source (2.048 MHz).
Note: clock source is selected using CLKSEL pin.
maxItems: 1
clock-names:
items:
- const: adc-clk
interrupts:
description: |
IRQ line for the ADC data ready.
maxItems: 1
vref-supply:
description: |
Optional external voltage reference. If not supplied, internal voltage
reference is used.
ti,vref-internal:
description: |
Select the internal voltage reference value.
0: 2.4V
1: 4.0V
If this field is left empty, 2.4V is selected.
Note: internal voltage reference is used only if vref-supply is not supplied.
$ref: /schemas/types.yaml#/definitions/uint32
enum: [0, 1]
default: 0
'#address-cells':
const: 1
'#size-cells':
const: 0
required:
- compatible
- reg
- spi-cpha
- clocks
- clock-names
- interrupts
patternProperties:
"^channel@([0-7])$":
$ref: "adc.yaml"
type: object
description: |
Represents the external channels which are connected to the ADC.
properties:
reg:
description: |
The channel number.
Up to 4 channels, numbered from 0 to 3 for ti,ads131e04.
Up to 6 channels, numbered from 0 to 5 for ti,ads131e06.
Up to 8 channels, numbered from 0 to 7 for ti,ads131e08.
items:
minimum: 0
maximum: 7
ti,gain:
description: |
The PGA gain value for the channel.
If this field is left empty, PGA gain 1 is used.
$ref: /schemas/types.yaml#/definitions/uint32
enum: [1, 2, 4, 8, 12]
default: 1
ti,mux:
description: |
Channel input selection(muliplexer).
0: Normal input.
1: Input shorted to (VREFP + VREFN) / 2 (for offset or noise measurements).
3: MVDD (for supply measurement)
4: Temperature sensor
If this field is left empty, normal input is selected.
$ref: /schemas/types.yaml#/definitions/uint32
enum: [0, 1, 3, 4]
default: 0
required:
- reg
additionalProperties: false
allOf:
- $ref: /schemas/spi/spi-peripheral-props.yaml#
unevaluatedProperties: false
examples:
- |
#include <dt-bindings/interrupt-controller/irq.h>
spi {
#address-cells = <1>;
#size-cells = <0>;
adc@0 {
compatible = "ti,ads131e08";
reg = <0>;
spi-max-frequency = <1000000>;
spi-cpha;
clocks = <&clk2048k>;
clock-names = "adc-clk";
interrupt-parent = <&gpio5>;
interrupts = <28 IRQ_TYPE_EDGE_FALLING>;
vref-supply = <&adc_vref>;
#address-cells = <1>;
#size-cells = <0>;
channel@0 {
reg = <0>;
};
channel@1 {
reg = <1>;
};
channel@2 {
reg = <2>;
ti,gain = <2>;
};
channel@3 {
reg = <3>;
};
channel@4 {
reg = <4>;
};
channel@5 {
reg = <5>;
};
channel@6 {
reg = <6>;
};
channel@7 {
reg = <7>;
ti,mux = <4>;
};
};
};
|
