mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/chenhuacai/linux-loongson
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0fbd8017ab
Add devicetree support for spi 3-wire configuration. Signed-off-by: Antoniu Miclaus <antoniu.miclaus@analog.com> Acked-by: Rob Herring (Arm) <robh@kernel.org> Link: https://patch.msgid.link/20250626104024.8645-1-antoniu.miclaus@analog.com Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
156 lines
3.4 KiB
YAML
156 lines
3.4 KiB
YAML
# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
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# Copyright 2024 Analog Devices Inc.
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%YAML 1.2
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---
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$id: http://devicetree.org/schemas/iio/adc/adi,ad4851.yaml#
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$schema: http://devicetree.org/meta-schemas/core.yaml#
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title: Analog Devices AD485X family
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maintainers:
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- Sergiu Cuciurean <sergiu.cuciurean@analog.com>
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- Dragos Bogdan <dragos.bogdan@analog.com>
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- Antoniu Miclaus <antoniu.miclaus@analog.com>
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description: |
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Analog Devices AD485X fully buffered, 8-channel simultaneous sampling,
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16/20-bit, 1 MSPS data acquisition system (DAS) with differential, wide
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common-mode range inputs.
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https://www.analog.com/media/en/technical-documentation/data-sheets/ad4855.pdf
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https://www.analog.com/media/en/technical-documentation/data-sheets/ad4856.pdf
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https://www.analog.com/media/en/technical-documentation/data-sheets/ad4857.pdf
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https://www.analog.com/media/en/technical-documentation/data-sheets/ad4858.pdf
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$ref: /schemas/spi/spi-peripheral-props.yaml#
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properties:
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compatible:
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enum:
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- adi,ad4851
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- adi,ad4852
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- adi,ad4853
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- adi,ad4854
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- adi,ad4855
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- adi,ad4856
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- adi,ad4857
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- adi,ad4858
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- adi,ad4858i
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reg:
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maxItems: 1
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vcc-supply: true
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vee-supply: true
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vdd-supply: true
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vddh-supply: true
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vddl-supply: true
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vio-supply: true
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vrefbuf-supply: true
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vrefio-supply: true
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pwms:
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description: PWM connected to the CNV pin.
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maxItems: 1
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io-backends:
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maxItems: 1
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pd-gpios:
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maxItems: 1
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spi-max-frequency:
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maximum: 25000000
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spi-3wire: true
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'#address-cells':
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const: 1
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'#size-cells':
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const: 0
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patternProperties:
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"^channel(@[0-7])?$":
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$ref: adc.yaml
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type: object
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description: Represents the channels which are connected to the ADC.
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properties:
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reg:
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description:
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The channel number, as specified in the datasheet (from 0 to 7).
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minimum: 0
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maximum: 7
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diff-channels:
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description:
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Each channel can be configured as a bipolar differential channel.
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The ADC uses the same positive and negative inputs for this.
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This property must be specified as 'reg' (or the channel number) for
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both positive and negative inputs (i.e. diff-channels = <reg reg>).
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Since the configuration is bipolar differential, the 'bipolar'
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property is required.
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items:
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minimum: 0
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maximum: 7
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bipolar: true
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required:
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- reg
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additionalProperties: false
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required:
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- compatible
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- reg
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- vcc-supply
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- vee-supply
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- vdd-supply
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- vio-supply
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- pwms
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unevaluatedProperties: false
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examples:
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- |
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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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#address-cells = <1>;
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#size-cells = <0>;
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compatible = "adi,ad4858";
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reg = <0>;
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spi-max-frequency = <10000000>;
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vcc-supply = <&vcc>;
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vdd-supply = <&vdd>;
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vee-supply = <&vee>;
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vddh-supply = <&vddh>;
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vddl-supply = <&vddl>;
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vio-supply = <&vio>;
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pwms = <&pwm_gen 0 0>;
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io-backends = <&iio_backend>;
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channel@0 {
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reg = <0>;
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diff-channels = <0 0>;
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bipolar;
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};
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channel@1 {
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reg = <1>;
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};
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};
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};
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...
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