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# SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause)
# Copyright 2020 Analog Devices Inc.
%YAML 1.2
---
$id: http://devicetree.org/schemas/iio/dac/adi,ad3552r.yaml#
$schema: http://devicetree.org/meta-schemas/core.yaml#
title: Analog Devices AD2552R DAC device driver
maintainers:
- Nuno Sá <nuno.sa@analog.com>
description: |
Bindings for the Analog Devices AD3552R DAC device and similar.
Datasheet can be found here:
https://www.analog.com/media/en/technical-documentation/data-sheets/ad3542r.pdf
https://www.analog.com/media/en/technical-documentation/data-sheets/ad3552r.pdf
properties:
compatible:
enum:
- adi,ad3542r
- adi,ad3552r
reg:
maxItems: 1
spi-max-frequency:
maximum: 30000000
reset-gpios:
maxItems: 1
ldac-gpios:
description: |
LDAC pin to be used as a hardware trigger to update the DAC channels.
maxItems: 1
vref-supply:
description:
The regulator to use as an external reference. If it does not exists the
internal reference will be used. External reference must be 2.5V
adi,vref-out-en:
description: Vref I/O driven by internal vref to 2.5V. If not set, Vref pin
will be floating.
type: boolean
adi,sdo-drive-strength:
description: |
Configure SDIO0 and SDIO1 strength levels:
- 0: low SDO drive strength.
- 1: medium low SDO drive strength.
- 2: medium high SDO drive strength.
- 3: high SDO drive strength
$ref: /schemas/types.yaml#/definitions/uint32
enum: [0, 1, 2, 3]
'#address-cells':
const: 1
'#size-cells':
const: 0
patternProperties:
"^channel@([0-1])$":
type: object
description: Configurations of the DAC Channels
additionalProperties: false
properties:
reg:
description: Channel number
enum: [0, 1]
adi,output-range-microvolt: true
custom-output-range-config:
type: object
additionalProperties: false
description: Configuration of custom range when
adi,output-range-microvolt is not present.
The formulas for calculation the output voltages are
Vout_fs = 2.5 + [(GainN + Offset/1024) * 2.5 * Rfbx * 1.03]
Vout_zs = 2.5 - [(GainP + Offset/1024) * 2.5 * Rfbx * 1.03]
properties:
adi,gain-offset:
description: Gain offset used in the above formula
$ref: /schemas/types.yaml#/definitions/int32
maximum: 511
minimum: -511
adi,gain-scaling-p-inv-log2:
description: GainP = 1 / ( 2 ^ adi,gain-scaling-p-inv-log2)
$ref: /schemas/types.yaml#/definitions/uint32
enum: [0, 1, 2, 3]
adi,gain-scaling-n-inv-log2:
description: GainN = 1 / ( 2 ^ adi,gain-scaling-n-inv-log2)
$ref: /schemas/types.yaml#/definitions/uint32
enum: [0, 1, 2, 3]
adi,rfb-ohms:
description: Feedback Resistor
required:
- adi,gain-offset
- adi,gain-scaling-p-inv-log2
- adi,gain-scaling-n-inv-log2
- adi,rfb-ohms
required:
- reg
oneOf:
# If adi,output-range-microvolt is missing,
# custom-output-range-config must be used
- required:
- adi,output-range-microvolt
- required:
- custom-output-range-config
allOf:
- if:
properties:
compatible:
contains:
const: adi,ad3542r
then:
patternProperties:
"^channel@([0-1])$":
type: object
properties:
adi,output-range-microvolt:
description: |
Voltage output range of the channel as <minimum, maximum>
Required connections:
Rfb1x for: 0 to 2.5 V; 0 to 3V; 0 to 5 V;
Rfb2x for: 0 to 10 V; 2.5 to 7.5V; -5 to 5 V;
oneOf:
- items:
- const: 0
- enum: [2500000, 3000000, 5000000, 10000000]
- items:
- const: -2500000
- const: 7500000
- items:
- const: -5000000
- const: 5000000
required:
- adi,output-range-microvolt
- if:
properties:
compatible:
contains:
const: adi,ad3552r
then:
patternProperties:
"^channel@([0-1])$":
type: object
properties:
adi,output-range-microvolt:
description: |
Voltage output range of the channel as <minimum, maximum>
Required connections:
Rfb1x for: 0 to 2.5 V; 0 to 5 V;
Rfb2x for: 0 to 10 V; -5 to 5 V;
Rfb4x for: -10 to 10V
oneOf:
- items:
- const: 0
- enum: [2500000, 5000000, 10000000]
- items:
- const: -5000000
- const: 5000000
- items:
- const: -10000000
- const: 10000000
required:
- compatible
- reg
- spi-max-frequency
additionalProperties: false
examples:
- |
spi {
#address-cells = <1>;
#size-cells = <0>;
ad3552r@0 {
compatible = "adi,ad3552r";
reg = <0>;
spi-max-frequency = <20000000>;
#address-cells = <1>;
#size-cells = <0>;
channel@0 {
reg = <0>;
adi,output-range-microvolt = <0 10000000>;
};
channel@1 {
reg = <1>;
custom-output-range-config {
adi,gain-offset = <5>;
adi,gain-scaling-p-inv-log2 = <1>;
adi,gain-scaling-n-inv-log2 = <2>;
adi,rfb-ohms = <1>;
};
};
};
};
...
|
