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https://git.kernel.org/pub/scm/linux/kernel/git/chenhuacai/linux-loongson
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f52b5daf39
AD7191 is a pin-programmable, ultra-low noise 24-bit sigma-delta ADC designed for precision bridge sensor measurements. It features two differential analog input channels, selectable output rates, programmable gain, internal temperature sensor and simultaneous 50Hz/60Hz rejection. Signed-off-by: Alisa-Dariana Roman <alisa.roman@analog.com> Reviewed-by: Rob Herring (Arm) <robh@kernel.org> Reviewed-by: David Lechner<dlechner@baylibre.com> Link: https://patch.msgid.link/20250228141327.262488-2-alisa.roman@analog.com Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
150 lines
3.6 KiB
YAML
150 lines
3.6 KiB
YAML
# SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause)
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# Copyright 2025 Analog Devices Inc.
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%YAML 1.2
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---
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$id: http://devicetree.org/schemas/iio/adc/adi,ad7191.yaml#
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$schema: http://devicetree.org/meta-schemas/core.yaml#
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title: Analog Devices AD7191 ADC
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maintainers:
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- Alisa-Dariana Roman <alisa.roman@analog.com>
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description: |
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Bindings for the Analog Devices AD7191 ADC device. Datasheet can be
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found here:
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https://www.analog.com/media/en/technical-documentation/data-sheets/AD7191.pdf
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The device's PDOWN pin must be connected to the SPI controller's chip select
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pin.
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properties:
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compatible:
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enum:
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- adi,ad7191
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reg:
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maxItems: 1
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spi-cpol: true
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spi-cpha: true
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clocks:
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maxItems: 1
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description:
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Must be present when CLKSEL pin is tied HIGH to select external clock
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source (either a crystal between MCLK1 and MCLK2 pins, or a
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CMOS-compatible clock driving MCLK2 pin). Must be absent when CLKSEL pin
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is tied LOW to use the internal 4.92MHz clock.
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interrupts:
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maxItems: 1
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avdd-supply:
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description: AVdd voltage supply
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dvdd-supply:
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description: DVdd voltage supply
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vref-supply:
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description: Vref voltage supply
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odr-gpios:
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description:
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ODR1 and ODR2 pins for output data rate selection. Should be defined if
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adi,odr-value is absent.
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minItems: 2
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maxItems: 2
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adi,odr-value:
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$ref: /schemas/types.yaml#/definitions/uint32
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description: |
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Should be present if ODR pins are pin-strapped. Possible values:
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120 Hz (ODR1=0, ODR2=0)
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60 Hz (ODR1=0, ODR2=1)
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50 Hz (ODR1=1, ODR2=0)
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10 Hz (ODR1=1, ODR2=1)
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If defined, odr-gpios must be absent.
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enum: [120, 60, 50, 10]
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pga-gpios:
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description:
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PGA1 and PGA2 pins for gain selection. Should be defined if adi,pga-value
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is absent.
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minItems: 2
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maxItems: 2
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adi,pga-value:
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$ref: /schemas/types.yaml#/definitions/uint32
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description: |
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Should be present if PGA pins are pin-strapped. Possible values:
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Gain 1 (PGA1=0, PGA2=0)
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Gain 8 (PGA1=0, PGA2=1)
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Gain 64 (PGA1=1, PGA2=0)
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Gain 128 (PGA1=1, PGA2=1)
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If defined, pga-gpios must be absent.
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enum: [1, 8, 64, 128]
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temp-gpios:
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description: TEMP pin for temperature sensor enable.
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maxItems: 1
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chan-gpios:
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description: CHAN pin for input channel selection.
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maxItems: 1
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required:
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- compatible
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- reg
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- interrupts
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- avdd-supply
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- dvdd-supply
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- vref-supply
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- spi-cpol
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- spi-cpha
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- temp-gpios
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- chan-gpios
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allOf:
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- $ref: /schemas/spi/spi-peripheral-props.yaml#
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- oneOf:
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- required:
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- adi,odr-value
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- required:
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- odr-gpios
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- oneOf:
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- required:
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- adi,pga-value
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- required:
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- pga-gpios
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unevaluatedProperties: false
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examples:
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- |
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#include <dt-bindings/gpio/gpio.h>
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#include <dt-bindings/interrupt-controller/irq.h>
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spi {
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#address-cells = <1>;
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#size-cells = <0>;
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adc@0 {
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compatible = "adi,ad7191";
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reg = <0>;
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spi-max-frequency = <1000000>;
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spi-cpol;
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spi-cpha;
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clocks = <&ad7191_mclk>;
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interrupts = <25 IRQ_TYPE_EDGE_FALLING>;
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interrupt-parent = <&gpio>;
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avdd-supply = <&avdd>;
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dvdd-supply = <&dvdd>;
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vref-supply = <&vref>;
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adi,pga-value = <1>;
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odr-gpios = <&gpio 23 GPIO_ACTIVE_HIGH>, <&gpio 24 GPIO_ACTIVE_HIGH>;
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temp-gpios = <&gpio 22 GPIO_ACTIVE_HIGH>;
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chan-gpios = <&gpio 27 GPIO_ACTIVE_HIGH>;
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};
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};
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