Add support for: AD7172-2, AD7175-8, AD7177-2
Add hardware description of the AD771X family instead of "Bindings for"
AD7172-4 does not feature an internal reference, check for ext-ref
Signed-off-by: Dumitru Ceclan <mitrutzceclan@xxxxxxxxx>
---
.../bindings/iio/adc/adi,ad7173.yaml | 50 +++++++++++++++++--
1 file changed, 46 insertions(+), 4 deletions(-)
diff --git a/Documentation/devicetree/bindings/iio/adc/adi,ad7173.yaml b/Documentation/devicetree/bindings/iio/adc/adi,ad7173.yaml
index 7c8caef76528..6d4b26e43144 100644
--- a/Documentation/devicetree/bindings/iio/adc/adi,ad7173.yaml
+++ b/Documentation/devicetree/bindings/iio/adc/adi,ad7173.yaml
@@ -11,19 +11,33 @@ maintainers:
- Ceclan Dumitru <dumitru.ceclan@xxxxxxxxxx>
description: |
- Bindings for the Analog Devices AD717X ADC's. Datasheets for supported chips:
+ Analog Devices AD717X ADC's:
+ The AD717x family offer a complete integrated Sigma-Delta ADC solution which
+ can be used in high precision, low noise single channel applications
+ (Life Science measurements) or higher speed multiplexed applications
+ (Factory Automation PLC Input modules). 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.
+
+ 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/AD7172-4.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/AD7175-8.pdf
https://www.analog.com/media/en/technical-documentation/data-sheets/AD7176-2.pdf
+ https://www.analog.com/media/en/technical-documentation/data-sheets/AD7177-2.pdf
properties:
compatible:
enum:
- adi,ad7172-2
+ - adi,ad7172-4
- adi,ad7173-8
- adi,ad7175-2
+ - adi,ad7175-8
- adi,ad7176-2
+ - adi,ad7177-2
reg:
maxItems: 1
@@ -89,8 +103,10 @@ patternProperties:
refout-avss: REFOUT/AVSS (Internal reference)
avdd : AVDD
- External reference refin2 only available on ad7173-8.
- If not specified, internal reference used.
+ External reference refin2 only available on ad7173-8 and ad7172-4.
+ Internal reference refout-avss not available on ad7172-4.
+
+ If not specified, internal reference used (if available).
$ref: /schemas/types.yaml#/definitions/string
enum:
- refin
@@ -111,12 +127,15 @@ required:
allOf:
- $ref: /schemas/spi/spi-peripheral-props.yaml#
+ # Only ad7172-4 and ad7173-8 support refin2
- if:
properties:
compatible:
not:
contains:
- const: adi,ad7173-8
+ anyOf:
+ - const: adi,ad7172-4
+ - const: adi,ad7173-8
then:
properties:
refin2-supply: false
@@ -129,6 +148,29 @@ allOf:
- refout-avss
- avdd
+ # Model ad7172-4 does not support internal reference
+ # mandatory to have an external reference
+ - if:
+ properties:
+ compatible:
+ contains:
+ const: adi,ad7172-4
+ then:
+ patternProperties:
+ "^channel@[0-9a-f]$":
+ properties:
+ adi,reference-select:
+ enum:
+ - refin
+ - refin2
+ - avdd
+ default: false
+ required:
+ - adi,reference-select
+ oneOf:
+ - required: [refin2-supply]
+ - required: [refin-supply]
+
unevaluatedProperties: false
examples:
--
2.42.0
