Add device tree bindings for AD4695 and similar ADCs. Signed-off-by: David Lechner <dlechner@xxxxxxxxxxxx> --- .../devicetree/bindings/iio/adc/adi,ad4695.yaml | 297 +++++++++++++++++++++ MAINTAINERS | 9 + 2 files changed, 306 insertions(+) diff --git a/Documentation/devicetree/bindings/iio/adc/adi,ad4695.yaml b/Documentation/devicetree/bindings/iio/adc/adi,ad4695.yaml new file mode 100644 index 000000000000..8ff5bbbbef9f --- /dev/null +++ b/Documentation/devicetree/bindings/iio/adc/adi,ad4695.yaml @@ -0,0 +1,297 @@ +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause) +%YAML 1.2 +--- +$id: http://devicetree.org/schemas/iio/adc/adi,ad4695.yaml# +$schema: http://devicetree.org/meta-schemas/core.yaml# + +title: Analog Devices Easy Drive Multiplexed SAR Analog to Digital Converters + +maintainers: + - Michael Hennerich <Michael.Hennerich@xxxxxxxxxx> + - Nuno Sá <nuno.sa@xxxxxxxxxx> + +description: | + A family of similar multi-channel analog to digital converters with SPI bus. + + * https://www.analog.com/en/products/ad4695.html + * https://www.analog.com/en/products/ad4696.html + * https://www.analog.com/en/products/ad4697.html + * https://www.analog.com/en/products/ad4698.html + +$ref: /schemas/spi/spi-peripheral-props.yaml# + +properties: + compatible: + oneOf: + - enum: + - adi,ad4695 + - adi,ad4697 + # same chips in WLCSP package with more pins + - items: + - const: adi,ad4695-wlcsp + - const: adi,ad4695 + - items: + - const: adi,ad4697-wlcsp + - const: adi,ad4697 + # same chips with higher max sample rate + - items: + - const: adi,ad4696 + - const: adi,ad4695 + - items: + - const: adi,ad4698 + - const: adi,ad4697 + # same chips with higher max sample rate in WLCSP package + - items: + - const: adi,ad4696-wlcsp + - const: adi,ad4696 + - const: adi,ad4695-wlcsp + - const: adi,ad4695 + - items: + - const: adi,ad4698-wlcsp + - const: adi,ad4698 + - const: adi,ad4697-wlcsp + - const: adi,ad4697 + + reg: + maxItems: 1 + + spi-max-frequency: + maximum: 80000000 + + spi-cpol: true + spi-cpha: true + + spi-rx-bus-width: + minimum: 1 + maximum: 4 + + avdd-supply: + description: A 2.7 V to 5.5 V supply that powers the analog circuitry. + + ldo-in-supply: + description: A 2.4 V to 5.5 V supply connected to the internal LDO input. + + vdd-supply: + description: A 1.8V supply that powers the core circuitry. + + vio-supply: + description: A 1.2V to 1.8V supply for the digital inputs and outputs. + + ref-supply: + description: A 2.4 V to 5.1 V supply for the external reference voltage. + + refin-supply: + description: A 2.4 V to 5.1 V supply for the internal reference buffer input. + + com-supply: + description: Common voltage supply for pseudo-differential analog inputs. + + adi,no-ref-current-limit: + $ref: /schemas/types.yaml#/definitions/flag + description: + When this flag is present, the REF Overvoltage Reduced Current protection + is disabled. + + adi,no-ref-high-z: + $ref: /schemas/types.yaml#/definitions/flag + description: + Enable this flag if the ref-supply requires Reference Input High-Z Mode + to be disabled for proper operation. + + cnv-gpios: + description: The Convert Input (CNV). If omitted, CNV is tied to SPI CS. + maxItems: 1 + + reset-gpios: + description: The Reset Input (RESET). Should be configured GPIO_ACTIVE_LOW. + maxItems: 1 + + interrupts: + minItems: 1 + items: + - description: + Signal coming from the BSY_ALT_GP0 or GP3 pin that indicates a busy + condition. + - description: + Signal coming from the BSY_ALT_GP0 or GP2 pin that indicates an alert + condition. + + interrupt-names: + minItems: 1 + items: + - const: busy + - const: alert + + gpio-controller: true + + "#gpio-cells": + const: 2 + description: | + The first cell is the GPn number: 0 to 3. + The second cell takes standard GPIO flags. + + "#address-cells": + const: 1 + "#size-cells": + const: 0 + +patternProperties: + "^channel@[0-9a-f]$": + type: object + $ref: adc.yaml + unevaluatedProperties: false + description: + Describes each individual channel. In addition the properties defined + below, bipolar from adc.yaml is also supported. + + properties: + reg: + maximum: 15 + description: Input pin number (INx). + + adi,pin-pairing: + description: | + The input pin pairing for the negative input. This can be: + - REFGND, normally 0V (single-ended) + - COM, normally V_REF/2, see com-supply (pseudo-differential) + - For even numbered pins, the next odd numbered pin (differential) + $ref: /schemas/types.yaml#/definitions/string + enum: [refgnd, com, next] + default: refgnd + + adi,no-high-z: + $ref: /schemas/types.yaml#/definitions/flag + description: | + Enable this flag if the input pin requires the Analog Input High-Z + Mode to be disabled for proper operation. + + required: + - reg + + allOf: + # only even number pins can be paired with the next pin + - if: + properties: + reg: + not: + multipleOf: 2 + then: + properties: + adi,pin-pairing: + enum: [refgnd, com] + # bipolar mode is not supported with REFGND pairing + - if: + not: + required: + - adi,pin-pairing + then: + properties: + bipolar: false + else: + if: + properties: + adi,pin-pairing: + const: refgnd + then: + properties: + bipolar: false + +required: + - compatible + - reg + - avdd-supply + - vio-supply + +allOf: + - oneOf: + - required: + - ref-supply + - required: + - refin-supply + + - oneOf: + - required: + - ldo-in-supply + - required: + - vdd-supply + + # LFSCP package has fewer pins, so a few things are not valid in that case + - if: + properties: + compatible: + not: + contains: + pattern: -wlcsp$ + then: + properties: + refin-supply: false + spi-rx-bus-width: + maximum: 2 + + # the internal reference buffer always requires high-z mode + - if: + required: + - refin-supply + then: + properties: + adi,no-ref-high-z: false + + # limit channels for 8-channel chips + - if: + properties: + compatible: + contains: + const: adi,ad4697 + then: + patternProperties: + "^channel@[0-7]$": + properties: + reg: + maximum: 7 + "^channel@[8-9a-f]$": false + +unevaluatedProperties: false + +examples: + - | + #include <dt-bindings/gpio/gpio.h> + + spi { + #address-cells = <1>; + #size-cells = <0>; + + adc@0 { + compatible = "adi,ad4695"; + reg = <0>; + spi-cpol; + spi-cpha; + spi-max-frequency = <80000000>; + avdd-supply = <&supply_2_5V>; + vdd-supply = <&supply_1_8V>; + vio-supply = <&supply_1_2V>; + ref-supply = <&supply_5V>; + reset-gpios = <&gpio 1 GPIO_ACTIVE_LOW>; + + #address-cells = <1>; + #size-cells = <0>; + + /* Differential channel between IN0 and IN1. */ + channel@0 { + reg = <0>; + adi,pin-pairing = "next"; + bipolar; + }; + + /* Single-ended channel between IN2 and REFGND. */ + channel@2 { + reg = <2>; + }; + + /* Pseudo-differential channel between IN3 and COM. */ + channel@f { + reg = <3>; + adi,pin-pairing = "com"; + bipolar; + }; + }; + }; diff --git a/MAINTAINERS b/MAINTAINERS index c870bc6b8d63..8d15e4089d7c 100644 --- a/MAINTAINERS +++ b/MAINTAINERS @@ -1209,6 +1209,15 @@ F: Documentation/ABI/testing/sysfs-bus-iio-adc-ad4130 F: Documentation/devicetree/bindings/iio/adc/adi,ad4130.yaml F: drivers/iio/adc/ad4130.c +ANALOG DEVICES INC AD4695 DRIVER +M: Michael Hennerich <michael.hennerich@xxxxxxxxxx> +M: Nuno Sá <nuno.sa@xxxxxxxxxx> +R: David Lechner <dlechner@xxxxxxxxxxxx> +L: linux-iio@xxxxxxxxxxxxxxx +S: Supported +W: https://ez.analog.com/linux-software-drivers +F: Documentation/devicetree/bindings/iio/adc/adi,ad4695.yaml + ANALOG DEVICES INC AD7091R DRIVER M: Marcelo Schmitt <marcelo.schmitt@xxxxxxxxxx> L: linux-iio@xxxxxxxxxxxxxxx -- 2.45.2
