[PATCH 1/5] dt-bindings: iio: adc: Add TI ADS126x ADC family

From: Kurt Borja

Date: Fri Jun 12 2026 - 18:47:59 EST

Add TI ADS1262 and TI ADS1263 ADC2 devicetree bindings documentation.

Signed-off-by: Kurt Borja <kuurtb@xxxxxxxxx>
---
.../devicetree/bindings/iio/adc/ti,ads1262.yaml | 308 +++++++++++++++++++++
.../bindings/iio/adc/ti,ads1263-adc2.yaml | 49 ++++
MAINTAINERS | 7 +
3 files changed, 364 insertions(+)

diff --git a/Documentation/devicetree/bindings/iio/adc/ti,ads1262.yaml b/Documentation/devicetree/bindings/iio/adc/ti,ads1262.yaml
new file mode 100644
index 000000000000..1c4fde94f6c7
--- /dev/null
+++ b/Documentation/devicetree/bindings/iio/adc/ti,ads1262.yaml
@@ -0,0 +1,308 @@
+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/iio/adc/ti,ads1262.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: TI ADS1262/ADS1263 analog to digital converter
+
+maintainers:
+ - Kurt Borja <kuurtb@xxxxxxxxx>
+
+description: |
+ The ADS1262 and ADS1263 are 38.4-kSPS, delta-sigma (ΔΣ) ADCs with an
+ integrated PGA, reference, and internal fault monitors. The ADS1263 integrates
+ an auxiliary, 24-bit, ΔΣ ADC intended for background measurements.
+
+ Datasheets:
+ - ADS126x: https://www.ti.com/lit/ds/symlink/ads1262.pdf
+
+properties:
+ compatible:
+ enum:
+ - ti,ads1262
+ - ti,ads1263
+
+ reg:
+ maxItems: 1
+
+ '#address-cells':
+ const: 1
+
+ '#size-cells':
+ const: 0
+
+ spi-max-frequency:
+ maximum: 8000000
+
+ spi-cpha: true
+
+ interrupts:
+ description: Data ready (DRDY) interrupt line.
+ maxItems: 1
+
+ start-gpios:
+ description: Start conversion control.
+ maxItems: 1
+
+ reset-gpios:
+ maxItems: 1
+
+ dvdd-supply:
+ description: Digital power supply.
+
+ avdd-supply:
+ description: Analog power supply.
+
+ vref-supply:
+ description: Optional external voltage reference.
+
+ ti,pos-refmux:
+ $ref: /schemas/types.yaml#/definitions/uint32
+ description: |
+ Selects the positive voltage reference input:
+ 0: Internal 2.5 V reference
+ 1: AIN0 pin
+ 2: AIN2 pin
+ 3: AIN4 pin
+ 4: AVDD pin
+ minimum: 0
+ maximum: 4
+ default: 0
+
+ ti,neg-refmux:
+ $ref: /schemas/types.yaml#/definitions/uint32
+ description: |
+ Selects the negative voltage reference input:
+ 0: Internal 2.5 V reference
+ 1: AIN1 pin
+ 2: AIN3 pin
+ 3: AIN5 pin
+ 4: AVSS pin
+ minimum: 0
+ maximum: 4
+ default: 0
+
+ ti,vbias:
+ $ref: /schemas/types.yaml#/definitions/flag
+ description: Enables the level-shift voltage on the AINCOM pin.
+ default: false
+
+ ti,idac1-pin:
+ $ref: /schemas/types.yaml#/definitions/uint32
+ description: |
+ Selects the analog input pin to connect IDAC1:
+ 0: AIN0
+ 1: AIN1
+ 2: AIN2
+ 3: AIN3
+ 4: AIN4
+ 5: AIN5
+ 6: AIN6
+ 7: AIN7
+ 8: AIN8
+ 9: AIN9
+ 10: AINCOM
+ 11: No Connection
+ minimum: 0
+ maximum: 11
+ default: 11
+
+ ti,idac1-microamp:
+ description: Selects the current values of IDAC1.
+ enum: [0, 50, 100, 250, 500, 750, 1000, 1500, 2000, 2500, 3000]
+ default: 0
+
+ ti,idac2-pin:
+ $ref: /schemas/types.yaml#/definitions/uint32
+ description: |
+ Selects the analog input pin to connect IDAC2:
+ 0: AIN0
+ 1: AIN1
+ 2: AIN2
+ 3: AIN3
+ 4: AIN4
+ 5: AIN5
+ 6: AIN6
+ 7: AIN7
+ 8: AIN8
+ 9: AIN9
+ 10: AINCOM
+ 11: No Connection
+ minimum: 0
+ maximum: 11
+ default: 11
+
+ ti,idac2-microamp:
+ description: Selects the current values of IDAC2.
+ enum: [0, 50, 100, 250, 500, 750, 1000, 1500, 2000, 2500, 3000]
+ default: 0
+
+ clocks:
+ maxItems: 1
+
+ '#io-channel-cells':
+ const: 1
+
+ '#gpio-cells':
+ const: 2
+
+ gpio-controller: true
+
+ adc:
+ $ref: /schemas/iio/adc/ti,ads1263-adc2.yaml#
+
+required:
+ - compatible
+ - reg
+ - avdd-supply
+ - dvdd-supply
+ - '#address-cells'
+ - '#size-cells'
+
+unevaluatedProperties: false
+
+patternProperties:
+ "^channel@[0-9]+$":
+ $ref: /schemas/iio/adc/adc.yaml#
+ additionalProperties: false
+
+ properties:
+ reg:
+ maxItems: 1
+
+ diff-channels:
+ description: |
+ Selects the analog input configuration for this channel. The first
+ value is the positive input and the second is the negative input.
+ The following values are available:
+ 0: AIN0 pin
+ 1: AIN1 pin
+ 2: AIN2 pin
+ 3: AIN3 pin
+ 4: AIN4 pin
+ 5: AIN5 pin
+ 6: AIN6 pin
+ 7: AIN7 pin
+ 8: AIN8 pin
+ 9: AIN9 pin
+ 10: AINCOM pin
+ 11: Temperature sensor monitor
+ 12: Analog power supply monitor
+ 13: Digital power supply monitor
+ 14: TDAC test signal
+ 15: Float (open connection)
+ items:
+ minimum: 0
+ maximum: 15
+
+ ti,chop-mode:
+ $ref: /schemas/types.yaml#/definitions/flag
+ description:
+ When enabled, the ADC performs two internal conversions to cancel the
+ input offset voltage. The first conversion is taken with normal input
+ polarity. The ADC reverses the internal input polarity for the second
+ conversion. The difference of the two conversions is computed to yield
+ the final corrected result with the offset voltage removed.
+ default: false
+
+ ti,idac-rotation-mode:
+ $ref: /schemas/types.yaml#/definitions/flag
+ description:
+ The rotation mode automatically swaps the IDAC1 and IDAC2 connections
+ of alternate conversions. The ADC averages the alternate conversions
+ to eliminate IDAC mismatch.
+ default: false
+
+ ti,pga-bypass:
+ $ref: /schemas/types.yaml#/definitions/flag
+ description: Bypass the Programmable Gain Amplifier (PGA).
+ default: false
+
+ ti,rev-vref-pol:
+ $ref: /schemas/types.yaml#/definitions/flag
+ description:
+ The reference polarity can be negative, but the ADC requires a
+ positive voltage reference. In this case, the reference
+ polarity-reversal switch changes the reference polarity from negative
+ to positive.
+ default: false
+
+ ti,sbias-connection:
+ $ref: /schemas/types.yaml#/definitions/uint32
+ description: |
+ Selects the sensor bias current source connection:
+ 0: Sensor bias connected to ADC1 mux out
+ 1: Sensor bias connected to ADC2 mux out
+ minimum: 0
+ maximum: 1
+ default: 0
+
+ ti,sbias-polarity:
+ $ref: /schemas/types.yaml#/definitions/uint32
+ description: |
+ Selects the sensor bias current source polarity:
+ 0: Sensor bias pull-up
+ 1: Sensor bias pull-down
+ minimum: 0
+ maximum: 1
+ default: 0
+
+ ti,sbias-magnitude:
+ $ref: /schemas/types.yaml#/definitions/uint32
+ description: |
+ Selects the sensor bias magnitude:
+ 0: No sensor bias current or resistor
+ 1: 0.5-uA sensor bias current
+ 2: 2-uA sensor bias current
+ 3: 10-uA sensor bias current
+ 4: 50-uA sensor bias current
+ 5: 200-uA sensor bias current
+ 6: 10-Mohm resistor
+ minimum: 0
+ maximum: 6
+ default: 0
+
+ required:
+ - reg
+
+allOf:
+ - $ref: /schemas/spi/spi-peripheral-props.yaml#
+
+examples:
+ - |
+ #include <dt-bindings/gpio/gpio.h>
+
+ spi {
+ #address-cells = <1>;
+ #size-cells = <0>;
+
+ adc@0 {
+ compatible = "ti,ads1263";
+ reg = <0>;
+ spi-max-frequency = <8000000>;
+ spi-cpha;
+ avdd-supply = <&avdd>;
+ dvdd-supply = <&dvdd>;
+ #address-cells = <1>;
+ #size-cells = <0>;
+
+ reset-gpios = <&gpio 18 GPIO_ACTIVE_LOW>;
+
+ /* AINP: 0 - AINN: AINCOM */
+ channel@0 {
+ reg = <0>;
+ diff-channels = <0x0 0xA>;
+ };
+
+ /* Temperature sensor monitor */
+ channel@1 {
+ reg = <1>;
+ diff-channels = <0xB 0xB>;
+ };
+
+ adc {
+ compatible = "ti,ads1263-adc2";
+ };
+ };
+ };
diff --git a/Documentation/devicetree/bindings/iio/adc/ti,ads1263-adc2.yaml b/Documentation/devicetree/bindings/iio/adc/ti,ads1263-adc2.yaml
new file mode 100644
index 000000000000..9dd5577589b1
--- /dev/null
+++ b/Documentation/devicetree/bindings/iio/adc/ti,ads1263-adc2.yaml
@@ -0,0 +1,49 @@
+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/iio/adc/ti,ads1263-adc2.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: TI ADS1263 ADC2 analog-to-digital converter
+
+maintainers:
+ - Kurt Borja <kuurtb@xxxxxxxxx>
+
+description:
+ The ADS1263 includes an auxiliary, 24-bit, delta-sigma ADC (ADC2). ADC2
+ operation is independent of ADC1, with independent selections of input
+ channel, reference voltage, sample rate, and channel gain.
+
+properties:
+ compatible:
+ enum:
+ - ti,ads1263-adc2
+ vref-supply:
+ description: Optional external voltage reference.
+
+ ti,refmux:
+ $ref: /schemas/types.yaml#/definitions/uint32
+ description: |
+ Selects the positive voltage reference input:
+ 0: Internal 2.5 V reference
+ 1: AIN0-AIN1 pins
+ 2: AIN2-AIN3 pins
+ 3: AIN4-AIN5 pins
+ 4: AVDD-AVSS pins
+ minimum: 0
+ maximum: 4
+ default: 0
+
+ '#address-cells':
+ const: 1
+
+ '#size-cells':
+ const: 0
+
+ '#io-channel-cells':
+ const: 1
+
+required:
+ - compatible
+
+additionalProperties: false
diff --git a/MAINTAINERS b/MAINTAINERS
index 396d4e76dccc..9379699d99c6 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -26668,6 +26668,13 @@ S: Maintained
F: Documentation/devicetree/bindings/iio/adc/ti,ads1018.yaml
F: drivers/iio/adc/ti-ads1018.c

+TI ADS1262 ADC DRIVER
+M: Kurt Borja <kuurtb@xxxxxxxxx>
+L: linux-iio@xxxxxxxxxxxxxxx
+S: Maintained
+F: Documentation/devicetree/bindings/iio/adc/ti,ads1262.yaml
+F: Documentation/devicetree/bindings/iio/adc/ti,ads1263-adc2.yaml
+
TI ADS7924 ADC DRIVER
M: Hugo Villeneuve <hvilleneuve@xxxxxxxxxxxx>
L: linux-iio@xxxxxxxxxxxxxxx

--
2.54.0