[PATCH v4 1/6] dt-bindings: adc: ad7173: add support for ad411x
From: Dumitru Ceclan via B4 Relay
Date: Fri May 31 2024 - 15:43:21 EST
From: Dumitru Ceclan <dumitru.ceclan@xxxxxxxxxx>
Add support for: AD4111, AD4112, AD4114, AD4115, AD4116.
AD411x family ADCs support a VCOM pin. The purpose of this pin is to
offer a dedicated common-mode voltage input for single-ended channels.
This pin is specified as supporting a differential channel with VIN10 on
model AD4116.
AD4111/AD4112 support current channels. Support is implemented using
single-channel and "adi,current-channel".
Signed-off-by: Dumitru Ceclan <dumitru.ceclan@xxxxxxxxxx>
---
.../devicetree/bindings/iio/adc/adi,ad7173.yaml | 192 ++++++++++++++++++++-
1 file changed, 190 insertions(+), 2 deletions(-)
diff --git a/Documentation/devicetree/bindings/iio/adc/adi,ad7173.yaml b/Documentation/devicetree/bindings/iio/adc/adi,ad7173.yaml
index ea6cfcd0aff4..d8474eee553e 100644
--- a/Documentation/devicetree/bindings/iio/adc/adi,ad7173.yaml
+++ b/Documentation/devicetree/bindings/iio/adc/adi,ad7173.yaml
@@ -19,7 +19,18 @@ description: |
primarily for measurement of signals close to DC but also delivers
outstanding performance with input bandwidths out to ~10kHz.
+ Analog Devices AD411x ADC's:
+ The AD411X family encompasses a series of low power, low noise, 24-bit,
+ sigma-delta analog-to-digital converters that offer a versatile range of
+ specifications. They integrate an analog front end suitable for processing
+ fully differential/single-ended and bipolar voltage inputs.
+
Datasheets for supported chips:
+ https://www.analog.com/media/en/technical-documentation/data-sheets/AD4111.pdf
+ https://www.analog.com/media/en/technical-documentation/data-sheets/AD4112.pdf
+ https://www.analog.com/media/en/technical-documentation/data-sheets/AD4114.pdf
+ https://www.analog.com/media/en/technical-documentation/data-sheets/AD4115.pdf
+ https://www.analog.com/media/en/technical-documentation/data-sheets/AD4116.pdf
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
@@ -31,6 +42,11 @@ description: |
properties:
compatible:
enum:
+ - adi,ad4111
+ - adi,ad4112
+ - adi,ad4114
+ - adi,ad4115
+ - adi,ad4116
- adi,ad7172-2
- adi,ad7172-4
- adi,ad7173-8
@@ -129,10 +145,54 @@ patternProperties:
maximum: 15
diff-channels:
+ description: |
+ This property is used for defining the inputs of a differential
+ voltage channel. The first value is the positive input and the second
+ value is the negative input of the channel.
+
+ Family AD411x supports a dedicated VINCOM voltage input.
+ To select it set the second channel to 16.
+ (VIN2, VINCOM) -> diff-channels = <2 16>
+
+ There are special values that can be selected besides the voltage
+ analog inputs:
+ 21: REF+
+ 22: REF−
+ Supported only by AD7172-2, AD7172-4, AD7175-2, AD7175-8, AD7177-2:
+ 19: ((AVDD1 − AVSS)/5)+
+ 20: ((AVDD1 − AVSS)/5)−
+
items:
minimum: 0
maximum: 31
+ single-channel:
+ description: |
+ This property is used for defining a current channel or the positive
+ input of a voltage channel (single-ended or pseudo-differential).
+
+ Models AD4111 and AD4112 support current channels.
+ Example: (IIN2+, IIN2−) -> single-channel = <2>
+ To correctly configure a current channel set the "adi,current-channel"
+ property to true.
+
+ To configure a single-ended/pseudo-differential channel set the
+ "adi,common-mode-channel" property to the desired negative voltage input.
+
+ When used as a voltage channel, special inputs are valid as well.
+ minimum: 0
+ maximum: 31
+
+ adi,common-mode-channel:
+ $ref: /schemas/types.yaml#/definitions/uint32
+ description:
+ This property is used for defining the negative input of a
+ single-ended or pseudo-differential voltage channel.
+
+ Special inputs are valid as well.
+ minimum: 0
+ maximum: 31
+
adi,reference-select:
description: |
Select the reference source to use when converting on
@@ -154,9 +214,31 @@ patternProperties:
- avdd
default: refout-avss
+ adi,current-channel:
+ description: |
+ Signal that the selected inputs are current channels.
+ Only available on AD4111 and AD4112.
+ type: boolean
+
required:
- reg
- - diff-channels
+
+ allOf:
+ - oneOf:
+ - required: [single-channel]
+ properties:
+ diff-channels: false
+ - required: [diff-channels]
+ properties:
+ single-channel: false
+ adi,current-channel: false
+ adi,common-mode-channel: false
+
+ - if:
+ required: ["adi,common-mode-channel"]
+ then:
+ properties:
+ adi,current-channel: false
required:
- compatible
@@ -166,7 +248,6 @@ allOf:
- $ref: /schemas/spi/spi-peripheral-props.yaml#
# Only ad7172-4, ad7173-8 and ad7175-8 support vref2
- # Other models have [0-3] channel registers
- if:
properties:
compatible:
@@ -187,6 +268,37 @@ allOf:
- vref
- refout-avss
- avdd
+
+ - if:
+ properties:
+ compatible:
+ contains:
+ enum:
+ - adi,ad4114
+ - adi,ad4115
+ - adi,ad4116
+ - adi,ad7173-8
+ - adi,ad7175-8
+ then:
+ patternProperties:
+ "^channel@[0-9a-f]$":
+ properties:
+ reg:
+ maximum: 15
+
+ - if:
+ properties:
+ compatible:
+ contains:
+ enum:
+ - adi,ad7172-2
+ - adi,ad7175-2
+ - adi,ad7176-2
+ - adi,ad7177-2
+ then:
+ patternProperties:
+ "^channel@[0-9a-f]$":
+ properties:
reg:
maximum: 3
@@ -210,6 +322,34 @@ allOf:
required:
- adi,reference-select
+ - if:
+ properties:
+ compatible:
+ contains:
+ enum:
+ - adi,ad4111
+ - adi,ad4112
+ - adi,ad4114
+ - adi,ad4115
+ - adi,ad4116
+ then:
+ properties:
+ avdd2-supply: false
+
+ - if:
+ properties:
+ compatible:
+ not:
+ contains:
+ enum:
+ - adi,ad4111
+ - adi,ad4112
+ then:
+ patternProperties:
+ "^channel@[0-9a-f]$":
+ properties:
+ adi,current-channel: false
+
- if:
anyOf:
- required: [clock-names]
@@ -221,6 +361,7 @@ allOf:
unevaluatedProperties: false
examples:
+ # Example AD7173-8 with external reference connected to REF+/REF-:
- |
#include <dt-bindings/gpio/gpio.h>
#include <dt-bindings/interrupt-controller/irq.h>
@@ -277,3 +418,50 @@ examples:
};
};
};
+
+ # Example AD4111 with current channel and single-ended channel:
+ - |
+ #include <dt-bindings/gpio/gpio.h>
+ #include <dt-bindings/interrupt-controller/irq.h>
+
+ spi {
+ #address-cells = <1>;
+ #size-cells = <0>;
+
+ adc@0 {
+ compatible = "adi,ad4111";
+ reg = <0>;
+
+ #address-cells = <1>;
+ #size-cells = <0>;
+
+ interrupts = <25 IRQ_TYPE_EDGE_FALLING>;
+ interrupt-names = "rdy";
+ interrupt-parent = <&gpio>;
+ spi-max-frequency = <5000000>;
+ gpio-controller;
+ #gpio-cells = <2>;
+ #clock-cells = <0>;
+
+ channel@0 {
+ reg = <0>;
+ bipolar;
+ diff-channels = <4 5>;
+ };
+
+ // Single ended channel VIN2/VINCOM
+ channel@1 {
+ reg = <1>;
+ bipolar;
+ single-channel = <2>;
+ adi,common-mode-channel = <16>;
+ };
+
+ // Current channel IN2+/IN2-
+ channel@2 {
+ reg = <2>;
+ single-channel = <2>;
+ adi,current-channel;
+ };
+ };
+ };
--
2.43.0