[PATCH v5 8/9] dt-bindings: iio: adc: add docs for AD7606C-{16,18} parts

Alexandru Ardelean
2024-09-07T06:51:04Z

The driver will support the AD7606C-16 and AD7606C-18.
This change adds the compatible strings for these devices.

The AD7606C-16,18 channels also support these (individually configurable)
types of channels:
- bipolar single-ended
- unipolar single-ended
- bipolar differential

Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Signed-off-by: Alexandru Ardelean <aardelean@baylibre.com>
---
.../bindings/iio/adc/adi,ad7606.yaml | 117 ++++++++++++++++++
1 file changed, 117 insertions(+)

diff --git a/Documentation/devicetree/bindings/iio/adc/adi,ad7606.yaml b/Documentation/devicetree/bindings/iio/adc/adi,ad7606.yaml
index 69408cae3db9..2329afc1d6f9 100644
--- a/Documentation/devicetree/bindings/iio/adc/adi,ad7606.yaml
+++ b/Documentation/devicetree/bindings/iio/adc/adi,ad7606.yaml
@@ -14,6 +14,8 @@ description: |
https://www.analog.com/media/en/technical-documentation/data-sheets/AD7605-4.pdf
https://www.analog.com/media/en/technical-documentation/data-sheets/ad7606_7606-6_7606-4.pdf
https://www.analog.com/media/en/technical-documentation/data-sheets/AD7606B.pdf
+ https://www.analog.com/media/en/technical-documentation/data-sheets/ad7606c-16.pdf
+ https://www.analog.com/media/en/technical-documentation/data-sheets/ad7606c-18.pdf
https://www.analog.com/media/en/technical-documentation/data-sheets/AD7616.pdf

properties:
@@ -24,11 +26,19 @@ properties:
- adi,ad7606-6
- adi,ad7606-8 # Referred to as AD7606 (without -8) in the datasheet
- adi,ad7606b
+ - adi,ad7606c-16
+ - adi,ad7606c-18
- adi,ad7616

reg:
maxItems: 1

+ "#address-cells":
+ const: 1
+
+ "#size-cells":
+ const: 0
+
spi-cpha: true

spi-cpol: true
@@ -114,6 +124,46 @@ properties:
assumed that the pins are hardwired to VDD.
type: boolean

+patternProperties:
+ "^channel@[1-8]$":
+ type: object
+ $ref: adc.yaml
+ unevaluatedProperties: false
+
+ properties:
+ reg:
+ description:
+ The channel number, as specified in the datasheet (from 1 to 8).
+ minimum: 1
+ maximum: 8
+
+ diff-channels:
+ description:
+ Each channel can be configured as a differential bipolar channel.
+ The ADC uses the same positive and negative inputs for this.
+ This property must be specified as 'reg' (or the channel number) for
+ both positive and negative inputs (i.e. diff-channels = <reg reg>).
+ items:
+ minimum: 1
+ maximum: 8
+
+ bipolar:
+ description:
+ Each channel can be configured as a unipolar or bipolar single-ended.
+ When this property is not specified, it's unipolar, so the ADC will
+ have only the positive input wired.
+ For this ADC the 'diff-channels' & 'bipolar' properties are mutually
+ exclusive.
+
+ required:
+ - reg
+
+ oneOf:
+ - required:
+ - diff-channels
+ - required:
+ - bipolar
+
required:
- compatible
- reg
@@ -170,6 +220,25 @@ allOf:
adi,conversion-start-gpios:
maxItems: 1

+ - if:
+ not:
+ required:
+ - adi,sw-mode
+ then:
+ patternProperties:
+ "^channel@[1-8]$": false
+
+ - if:
+ not:
+ properties:
+ compatible:
+ enum:
+ - adi,ad7606c-16
+ - adi,ad7606c-18
+ then:
+ patternProperties:
+ "^channel@[1-8]$": false
+
unevaluatedProperties: false

examples:
@@ -202,4 +271,52 @@ examples:
standby-gpios = <&gpio 24 GPIO_ACTIVE_LOW>;
};
};
+ - |
+ #include <dt-bindings/gpio/gpio.h>
+ #include <dt-bindings/interrupt-controller/irq.h>
+ spi {
+ #address-cells = <1>;
+ #size-cells = <0>;
+
+ adc@0 {
+ compatible = "adi,ad7606c-18";
+ reg = <0>;
+
+ #address-cells = <1>;
+ #size-cells = <0>;
+
+ spi-max-frequency = <1000000>;
+ spi-cpol;
+ spi-cpha;
+
+ avcc-supply = <&adc_vref>;
+ vdrive-supply = <&vdd_supply>;
+
+ interrupts = <25 IRQ_TYPE_EDGE_FALLING>;
+ interrupt-parent = <&gpio>;
+
+ adi,conversion-start-gpios = <&gpio 17 GPIO_ACTIVE_HIGH>;
+ reset-gpios = <&gpio 27 GPIO_ACTIVE_HIGH>;
+ adi,first-data-gpios = <&gpio 22 GPIO_ACTIVE_HIGH>;
+ standby-gpios = <&gpio 24 GPIO_ACTIVE_LOW>;
+
+ adi,sw-mode;
+
+ channel@1 {
+ reg = <1>;
+ diff-channels = <1 1>;
+ };
+
+ channel@3 {
+ reg = <3>;
+ bipolar;
+ };
+
+ channel@8 {
+ reg = <8>;
+ diff-channels = <8 8>;
+ };
+
+ };
+ };
...
--
2.46.0