[PATCH v11 1/2] dt-bindings: adc: add AD7173

Dumitru Ceclan
2023-12-20T10:48:21Z

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.

Signed-off-by: Dumitru Ceclan <mitrutzceclan@gmail.com>
---
V10->V11
- Fix example warning: '#gpio-cells' is a dependency of 'gpio-controller'
- Add description to #gpio-cells property
V9->V10
- Fix dt_binding_check type warning from adi,reference-select
V8->v9
- Add gpio-controller and "#gpio-cells" properties
- Add missing avdd2 and iovdd supplies
- Add string type to reference-select
V7->V8
- include missing fix from V6
V6->V7 <no changes>
V5->V6
- Moved global required property to proper placement
V4 -> V5
- Use string enum instead of integers for "adi,reference-select"
- Fix conditional checking in regards to compatible
V3 -> V4
- include supply attributes
- add channel attribute for selecting conversion reference
V2 -> V3
- remove redundant descriptions
- use referenced 'bipolar' property
- remove newlines from example
V1 -> V2 <no changes>

.../bindings/iio/adc/adi,ad7173.yaml | 188 ++++++++++++++++++
1 file changed, 188 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..7c8caef76528
--- /dev/null
+++ b/Documentation/devicetree/bindings/iio/adc/adi,ad7173.yaml
@@ -0,0 +1,188 @@
+# 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
+
+maintainers:
+ - Ceclan Dumitru <dumitru.ceclan@analog.com>
+
+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
+
+ gpio-controller:
+ description: Marks the device node as a GPIO controller.
+
+ "#gpio-cells":
+ const: 2
+ description:
+ The first cell is the GPIO number and the second cell specifies
+ GPIO flags, as defined in <dt-bindings/gpio/gpio.h>.
+
+ 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.
+
+ avdd2-supply:
+ description: avdd2 supply, used as the input to the internal voltage regulator.
+
+ iovdd-supply:
+ description: iovdd supply, used for the chip digital interface.
+
+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:
+ refin : REFIN(+)/REFIN(−).
+ refin2 : REFIN2(+)/REFIN2(−)
+ refout-avss: REFOUT/AVSS (Internal reference)
+ avdd : AVDD
+
+ External reference refin2 only available on ad7173-8.
+ If not specified, internal reference used.
+ $ref: /schemas/types.yaml#/definitions/string
+ enum:
+ - refin
+ - refin2
+ - refout-avss
+ - avdd
+ default: refout-avss
+
+ required:
+ - reg
+ - diff-channels
+
+required:
+ - compatible
+ - reg
+ - interrupts
+
+allOf:
+ - $ref: /schemas/spi/spi-peripheral-props.yaml#
+
+ - if:
+ properties:
+ compatible:
+ not:
+ contains:
+ const: adi,ad7173-8
+ then:
+ properties:
+ refin2-supply: false
+ patternProperties:
+ "^channel@[0-9a-f]$":
+ properties:
+ adi,reference-select:
+ enum:
+ - refin
+ - refout-avss
+ - avdd
+
+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>;
+ gpio-controller;
+ #gpio-cells = <2>;
+
+ refin-supply = <&dummy_regulator>;
+
+ channel@0 {
+ reg = <0>;
+ bipolar;
+ diff-channels = <0 1>;
+ adi,reference-select = "refin";
+ };
+
+ 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>;
+ adi,reference-select = "avdd";
+ };
+ };
+ };
--
2.42.0