[PATCH v4 1/2] dt-bindings: adc: add AD7173

From: mitrutzceclan
Date: Thu Nov 16 2023 - 08:47:06 EST


From: Dumitru Ceclan <mitrutzceclan@xxxxxxxxx>

The AD7173 family offer a complete integrated Sigma-Delta ADC solution
which can be used in high precision, low noise single channel applications
or higher speed multiplexed applications. The Sigma-Delta ADC is intended
primarily for measurement of signals close to DC but also delivers
outstanding performance with input bandwidths out to ~10kHz.

Reviewed-by: Conor Dooley <conor.dooley@xxxxxxxxxxxxx> # except reference_select
Signed-off-by: Dumitru Ceclan <mitrutzceclan@xxxxxxxxx>
---
V3 -> V4
- include supply attributes
- add channel attribute for selecting conversion reference

.../bindings/iio/adc/adi,ad7173.yaml | 166 ++++++++++++++++++
1 file changed, 166 insertions(+)
create mode 100644 Documentation/devicetree/bindings/iio/adc/adi,ad7173.yaml

diff --git a/Documentation/devicetree/bindings/iio/adc/adi,ad7173.yaml b/Documentation/devicetree/bindings/iio/adc/adi,ad7173.yaml
new file mode 100644
index 000000000000..92aa352b6653
--- /dev/null
+++ b/Documentation/devicetree/bindings/iio/adc/adi,ad7173.yaml
@@ -0,0 +1,166 @@
+# SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause)
+# Copyright 2023 Analog Devices Inc.
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/iio/adc/adi,ad7173.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Analog Devices AD7173 ADC device driver
+
+maintainers:
+ - Ceclan Dumitru <dumitru.ceclan@xxxxxxxxxx>
+
+description: |
+ Bindings for the Analog Devices AD717X ADC's. Datasheets for supported chips:
+ https://www.analog.com/media/en/technical-documentation/data-sheets/AD7172-2.pdf
+ https://www.analog.com/media/en/technical-documentation/data-sheets/AD7173-8.pdf
+ https://www.analog.com/media/en/technical-documentation/data-sheets/AD7175-2.pdf
+ https://www.analog.com/media/en/technical-documentation/data-sheets/AD7176-2.pdf
+
+properties:
+ compatible:
+ enum:
+ - adi,ad7172-2
+ - adi,ad7173-8
+ - adi,ad7175-2
+ - adi,ad7176-2
+
+ reg:
+ maxItems: 1
+
+ interrupts:
+ maxItems: 1
+
+ '#address-cells':
+ const: 1
+
+ '#size-cells':
+ const: 0
+
+ spi-max-frequency:
+ maximum: 20000000
+
+ refin-supply:
+ description: external reference supply, can be used as reference for conversion.
+
+ refin2-supply:
+ description: external reference supply, can be used as reference for conversion.
+
+ avdd-supply:
+ description: avdd supply, can be used as reference for conversion.
+
+ dependencies:
+ refin2-supply:
+ properties:
+ compatible:
+ adi,ad7173-8
+
+ required:
+ - compatible
+ - reg
+ - interrupts
+
+patternProperties:
+ "^channel@[0-9a-f]$":
+ type: object
+ $ref: adc.yaml
+ unevaluatedProperties: false
+
+ properties:
+ reg:
+ minimum: 0
+ maximum: 15
+
+ diff-channels:
+ items:
+ minimum: 0
+ maximum: 31
+
+ adi,reference-select:
+ description: |
+ Select the reference source to use when converting on
+ the specific channel. Valid values are:
+ 0: REFIN(+)/REFIN(−).
+ 1: REFIN2(+)/REFIN2(−)
+ 2: REFOUT/AVSS (Internal reference)
+ 3: AVDD
+
+ External reference 2 only available on ad7173-8.
+ If not specified, internal reference used.
+ $ref: /schemas/types.yaml#/definitions/uint32
+ enum: [0, 1, 2, 3]
+ default: 2
+
+ bipolar:
+ type: boolean
+
+ required:
+ - reg
+ - diff-channels
+
+allOf:
+ - $ref: /schemas/spi/spi-peripheral-props.yaml#
+
+ - if:
+ properties:
+ compatible:
+ contains:
+ const: adi,ad7173-8
+ then:
+ else:
+ patternProperties:
+ "^channel@[0-9a-f]$":
+ properties:
+ enum: [0, 2, 3]
+
+unevaluatedProperties: false
+
+examples:
+ - |
+ #include <dt-bindings/gpio/gpio.h>
+ #include <dt-bindings/interrupt-controller/irq.h>
+
+ spi {
+ #address-cells = <1>;
+ #size-cells = <0>;
+
+ adc@0 {
+ compatible = "adi,ad7173-8";
+ reg = <0>;
+
+ #address-cells = <1>;
+ #size-cells = <0>;
+
+ interrupts = <25 IRQ_TYPE_EDGE_FALLING>;
+ interrupt-parent = <&gpio>;
+ spi-max-frequency = <5000000>;
+
+ channel@0 {
+ reg = <0>;
+ bipolar;
+ diff-channels = <0 1>;
+ };
+
+ channel@1 {
+ reg = <1>;
+ diff-channels = <2 3>;
+ };
+
+ channel@2 {
+ reg = <2>;
+ bipolar;
+ diff-channels = <4 5>;
+ };
+
+ channel@3 {
+ reg = <3>;
+ bipolar;
+ diff-channels = <6 7>;
+ };
+
+ channel@4 {
+ reg = <4>;
+ diff-channels = <8 9>;
+ };
+ };
+ };
--
2.42.0