Add device tree bindings for AD4695 and similar ADCs. Signed-off-by: David Lechner <dlechner@xxxxxxxxxxxx> --- v2 changes: * Drop *-wlcsp compatible strings * Don't use fallback compatible strings * Reword supply descriptions * Use standard channel properties instead of adi,pin-pairing * Fix unnecessary | character * Fix missing blank line * Add header file with common mode channel macros --- .../devicetree/bindings/iio/adc/adi,ad4695.yaml | 290 +++++++++++++++++++++ MAINTAINERS | 10 + include/dt-bindings/iio/adi,ad4695.h | 9 + 3 files changed, 309 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..e5dafb1f6acf --- /dev/null +++ b/Documentation/devicetree/bindings/iio/adc/adi,ad4695.yaml @@ -0,0 +1,290 @@ +# 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: + enum: + - adi,ad4695 + - adi,ad4696 + - adi,ad4697 + - adi,ad4698 + + 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: Analog power supply. + + vio-supply: + description: I/O pin power supply. + + ldo-in-supply: + description: Internal LDO Input. Mutually exclusive with vdd-supply. + + vdd-supply: + description: Core power supply. Mutually exclusive with ldo-in-supply. + + ref-supply: + description: + External reference voltage. Mutually exclusive with refin-supply. + + refin-supply: + description: + Internal reference buffer input. Mutually exclusive with ref-supply. + + 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 + + diff-channels: + description: + Describes inputs used for differential channels. The first value must + be an even numbered input and the second value must be the next + consecutive odd numbered input. + items: + - minimum: 0 + maximum: 14 + multipleOf: 2 + - minimum: 1 + maximum: 15 + not: + multipleOf: 2 + + single-channel: + minimum: 0 + maximum: 15 + + common-mode-channel: + description: + Describes the common mode channel for single channels. 0 is REFGND + and 1 is COM. Macros are available for these values in + dt-bindings/iio/adi,ad4695.h. + minimum: 0 + maximum: 1 + default: 0 + + adi,no-high-z: + $ref: /schemas/types.yaml#/definitions/flag + description: + Enable this flag if the input pin requires the Analog Input High-Z + Mode to be disabled for proper operation. + + required: + - reg + + oneOf: + - required: + - diff-channels + - required: + - single-channel + + allOf: + # bipolar mode can't be used with REFGND + - if: + required: + - single-channel + not: + required: + - common-mode-channel + then: + properties: + bipolar: false + - if: + required: + - common-mode-channel + properties: + common-mode-channel: + const: 0 + then: + properties: + bipolar: false + +required: + - compatible + - reg + - avdd-supply + - vio-supply + +allOf: + - oneOf: + - required: + - ldo-in-supply + - required: + - vdd-supply + + - oneOf: + - required: + - ref-supply + - required: + - refin-supply + + # the internal reference buffer always requires high-z mode + - if: + required: + - refin-supply + then: + properties: + adi,no-ref-high-z: false + + # limit channels for 8-channel chips + - if: + properties: + compatible: + contains: + enum: + - adi,ad4697 + - adi,ad4698 + then: + patternProperties: + "^channel@[0-7]$": + properties: + reg: + maximum: 7 + diff-channels: + items: + - maximum: 6 + - maximum: 7 + single-channel: + maximum: 7 + "^channel@[8-9a-f]$": false + +unevaluatedProperties: false + +examples: + - | + #include <dt-bindings/gpio/gpio.h> + #include <dt-bindings/iio/adi,ad4695.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 = <&power_supply>; + ldo-in-supply = <&power_supply>; + vio-supply = <&io_supply>; + refin-supply = <&supply_5V>; + com-supply = <&supply_2V5>; + reset-gpios = <&gpio 1 GPIO_ACTIVE_LOW>; + + #address-cells = <1>; + #size-cells = <0>; + + /* Differential channel between IN0 and IN1. */ + channel@0 { + reg = <0>; + diff-channels = <0>, <1>; + bipolar; + }; + + /* Single-ended channel between IN2 and REFGND. */ + channel@1 { + reg = <1>; + single-channel = <2>; + }; + + /* Pseudo-differential channel between IN3 and COM. */ + channel@2 { + reg = <2>; + single-channel = <3>; + common-mode-channel = <AD4695_COMMON_MODE_COM>; + bipolar; + }; + }; + }; diff --git a/MAINTAINERS b/MAINTAINERS index c870bc6b8d63..19d4bc962c77 100644 --- a/MAINTAINERS +++ b/MAINTAINERS @@ -1209,6 +1209,16 @@ 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 +F: include/dt-bindings/iio/adi,ad4695.h + ANALOG DEVICES INC AD7091R DRIVER M: Marcelo Schmitt <marcelo.schmitt@xxxxxxxxxx> L: linux-iio@xxxxxxxxxxxxxxx diff --git a/include/dt-bindings/iio/adi,ad4695.h b/include/dt-bindings/iio/adi,ad4695.h new file mode 100644 index 000000000000..87a1b94af62c --- /dev/null +++ b/include/dt-bindings/iio/adi,ad4695.h @@ -0,0 +1,9 @@ +/* SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause) */ + +#ifndef _DT_BINDINGS_ADI_AD4695_H +#define _DT_BINDINGS_ADI_AD4695_H + +#define AD4695_COMMON_MODE_REFGND 0 +#define AD4695_COMMON_MODE_COM 1 + +#endif /* _DT_BINDINGS_ADI_AD4695_H */ -- 2.45.2
