Add dt bindings for adc ad7779. Signed-off-by: Ramona Alexandra Nechita <ramona.nechita@xxxxxxxxxx> --- .../ABI/testing/sysfs-bus-iio-adc-ad777x | 23 +++++ .../bindings/iio/adc/adi,ad7779.yaml | 87 +++++++++++++++++++ 2 files changed, 110 insertions(+) create mode 100644 Documentation/ABI/testing/sysfs-bus-iio-adc-ad777x create mode 100644 Documentation/devicetree/bindings/iio/adc/adi,ad7779.yaml diff --git a/Documentation/ABI/testing/sysfs-bus-iio-adc-ad777x b/Documentation/ABI/testing/sysfs-bus-iio-adc-ad777x new file mode 100644 index 000000000000..0a57fda598e6 --- /dev/null +++ b/Documentation/ABI/testing/sysfs-bus-iio-adc-ad777x @@ -0,0 +1,23 @@ +What: /sys/bus/iio/devices/iio:deviceX/filter_type_available +KernelVersion: 6.1 +Contact: linux-iio@xxxxxxxxxxxxxxx +Description: + Reading returns a list with the possible filter modes. Only supported by + AD7771. + + * "sinc3" - The digital sinc3 filter implements three main notches, one at + the maximum ODR (128 kHz or 32 kHz, depending on the + power mode) and another two at the ODR frequency selected to + stop noise aliasing into the pass band. + + * "sinc5" - The sinc5 filter implements five notches, one at + the maximum ODR (128 kHz or 32 kHz, depending on the + power mode) and another four at the ODR frequency + selected to stop noise aliasing into the pass band. + +What: /sys/bus/iio/devices/iio:deviceX/filter_type +KernelVersion: 6.1 +Contact: linux-iio@xxxxxxxxxxxxxxx +Description: + Set the filter mode of the differential channel. The current sampling_frequency + is set according to the filter range. Only supported by AD7771. diff --git a/Documentation/devicetree/bindings/iio/adc/adi,ad7779.yaml b/Documentation/devicetree/bindings/iio/adc/adi,ad7779.yaml new file mode 100644 index 000000000000..632e9ec0ab44 --- /dev/null +++ b/Documentation/devicetree/bindings/iio/adc/adi,ad7779.yaml @@ -0,0 +1,87 @@ +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause) +%YAML 1.2 +--- +$id: http://devicetree.org/schemas/iio/adc/adi,ad7779.yaml# +$schema: http://devicetree.org/meta-schemas/core.yaml# + +title: Analog Devices AD777X family 8-Channel, 24-Bit, Simultaneous Sampling ADCs + +maintainers: + - Ramona Nechita <ramona.nechita@xxxxxxxxxx> + +description: | + The AD777X family consist of 8-channel, simultaneous sampling analog-to- + digital converter (ADC). Eight full Σ-Δ ADCs are on-chip. The + AD7771 provides an ultralow input current to allow direct sensor + connection. Each input channel has a programmable gain stage + allowing gains of 1, 2, 4, and 8 to map lower amplitude sensor + outputs into the full-scale ADC input range, maximizing the + dynamic range of the signal chain. + + https://www.analog.com/media/en/technical-documentation/data-sheets/ad7770.pdf + https://www.analog.com/media/en/technical-documentation/data-sheets/ad7771.pdf + https://www.analog.com/media/en/technical-documentation/data-sheets/ad7779.pdf + +$ref: /schemas/spi/spi-peripheral-props.yaml# + +properties: + compatible: + enum: + - adi,ad7770 + - adi,ad7771 + - adi,ad7779 + + reg: + maxItems: 1 + + '#address-cells': + const: 1 + + '#size-cells': + const: 0 + + spi-max-frequency: true + + clocks: + maxItems: 1 + + interrupts: + maxItems: 1 + + vref-supply: + description: + ADC reference voltage supply + + start-gpios: + description: + Pin that controls start synchronization pulse. + maxItems: 1 + + reset-gpios: + maxItems: 1 + +required: + - compatible + - reg + - clocks + +unevaluatedProperties: false + +examples: + - | + #include <dt-bindings/gpio/gpio.h> + spi { + #address-cells = <1>; + #size-cells = <0>; + + adc@0 { + compatible = "adi,ad7779"; + reg = <0>; + spi-max-frequency = <20000000>; + vref-supply = <&vref>; + start-gpios = <&gpio0 87 GPIO_ACTIVE_LOW>; + reset-gpios = <&gpio0 93 GPIO_ACTIVE_LOW>; + clocks = <&adc_clk>; + }; + }; +... -- 2.43.0
