| # SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause) |
| # Copyright 2020 Analog Devices Inc. |
| %YAML 1.2 |
| --- |
| $id: http://devicetree.org/schemas/iio/dac/adi,ad3552r.yaml# |
| $schema: http://devicetree.org/meta-schemas/core.yaml# |
| |
| title: Analog Devices AD2552R DAC device driver |
| |
| maintainers: |
| - Nuno Sá <nuno.sa@analog.com> |
| |
| description: | |
| Bindings for the Analog Devices AD3552R DAC device and similar. |
| Datasheet can be found here: |
| https://www.analog.com/media/en/technical-documentation/data-sheets/ad3542r.pdf |
| https://www.analog.com/media/en/technical-documentation/data-sheets/ad3552r.pdf |
| |
| properties: |
| compatible: |
| enum: |
| - adi,ad3542r |
| - adi,ad3552r |
| |
| reg: |
| maxItems: 1 |
| |
| spi-max-frequency: |
| maximum: 30000000 |
| |
| reset-gpios: |
| maxItems: 1 |
| |
| ldac-gpios: |
| description: | |
| LDAC pin to be used as a hardware trigger to update the DAC channels. |
| maxItems: 1 |
| |
| vref-supply: |
| description: |
| The regulator to use as an external reference. If it does not exists the |
| internal reference will be used. External reference must be 2.5V |
| |
| adi,vref-out-en: |
| description: Vref I/O driven by internal vref to 2.5V. If not set, Vref pin |
| will be floating. |
| type: boolean |
| |
| adi,sdo-drive-strength: |
| description: | |
| Configure SDIO0 and SDIO1 strength levels: |
| - 0: low SDO drive strength. |
| - 1: medium low SDO drive strength. |
| - 2: medium high SDO drive strength. |
| - 3: high SDO drive strength |
| $ref: /schemas/types.yaml#/definitions/uint32 |
| enum: [0, 1, 2, 3] |
| |
| '#address-cells': |
| const: 1 |
| |
| '#size-cells': |
| const: 0 |
| |
| patternProperties: |
| "^channel@([0-1])$": |
| type: object |
| description: Configurations of the DAC Channels |
| |
| additionalProperties: false |
| |
| properties: |
| reg: |
| description: Channel number |
| enum: [0, 1] |
| |
| adi,output-range-microvolt: true |
| |
| custom-output-range-config: |
| type: object |
| additionalProperties: false |
| description: Configuration of custom range when |
| adi,output-range-microvolt is not present. |
| The formulas for calculation the output voltages are |
| Vout_fs = 2.5 + [(GainN + Offset/1024) * 2.5 * Rfbx * 1.03] |
| Vout_zs = 2.5 - [(GainP + Offset/1024) * 2.5 * Rfbx * 1.03] |
| |
| properties: |
| adi,gain-offset: |
| description: Gain offset used in the above formula |
| $ref: /schemas/types.yaml#/definitions/int32 |
| maximum: 511 |
| minimum: -511 |
| |
| adi,gain-scaling-p-inv-log2: |
| description: GainP = 1 / ( 2 ^ adi,gain-scaling-p-inv-log2) |
| $ref: /schemas/types.yaml#/definitions/uint32 |
| enum: [0, 1, 2, 3] |
| |
| adi,gain-scaling-n-inv-log2: |
| description: GainN = 1 / ( 2 ^ adi,gain-scaling-n-inv-log2) |
| $ref: /schemas/types.yaml#/definitions/uint32 |
| enum: [0, 1, 2, 3] |
| |
| adi,rfb-ohms: |
| description: Feedback Resistor |
| |
| required: |
| - adi,gain-offset |
| - adi,gain-scaling-p-inv-log2 |
| - adi,gain-scaling-n-inv-log2 |
| - adi,rfb-ohms |
| |
| required: |
| - reg |
| |
| oneOf: |
| # If adi,output-range-microvolt is missing, |
| # custom-output-range-config must be used |
| - required: |
| - adi,output-range-microvolt |
| |
| - required: |
| - custom-output-range-config |
| |
| allOf: |
| - if: |
| properties: |
| compatible: |
| contains: |
| const: adi,ad3542r |
| then: |
| patternProperties: |
| "^channel@([0-1])$": |
| type: object |
| properties: |
| adi,output-range-microvolt: |
| description: | |
| Voltage output range of the channel as <minimum, maximum> |
| Required connections: |
| Rfb1x for: 0 to 2.5 V; 0 to 3V; 0 to 5 V; |
| Rfb2x for: 0 to 10 V; 2.5 to 7.5V; -5 to 5 V; |
| oneOf: |
| - items: |
| - const: 0 |
| - enum: [2500000, 3000000, 5000000, 10000000] |
| - items: |
| - const: -2500000 |
| - const: 7500000 |
| - items: |
| - const: -5000000 |
| - const: 5000000 |
| |
| required: |
| - adi,output-range-microvolt |
| |
| - if: |
| properties: |
| compatible: |
| contains: |
| const: adi,ad3552r |
| then: |
| patternProperties: |
| "^channel@([0-1])$": |
| type: object |
| properties: |
| adi,output-range-microvolt: |
| description: | |
| Voltage output range of the channel as <minimum, maximum> |
| Required connections: |
| Rfb1x for: 0 to 2.5 V; 0 to 5 V; |
| Rfb2x for: 0 to 10 V; -5 to 5 V; |
| Rfb4x for: -10 to 10V |
| oneOf: |
| - items: |
| - const: 0 |
| - enum: [2500000, 5000000, 10000000] |
| - items: |
| - const: -5000000 |
| - const: 5000000 |
| - items: |
| - const: -10000000 |
| - const: 10000000 |
| |
| required: |
| - compatible |
| - reg |
| - spi-max-frequency |
| |
| additionalProperties: false |
| |
| examples: |
| - | |
| spi { |
| #address-cells = <1>; |
| #size-cells = <0>; |
| ad3552r@0 { |
| compatible = "adi,ad3552r"; |
| reg = <0>; |
| spi-max-frequency = <20000000>; |
| #address-cells = <1>; |
| #size-cells = <0>; |
| channel@0 { |
| reg = <0>; |
| adi,output-range-microvolt = <0 10000000>; |
| }; |
| channel@1 { |
| reg = <1>; |
| custom-output-range-config { |
| adi,gain-offset = <5>; |
| adi,gain-scaling-p-inv-log2 = <1>; |
| adi,gain-scaling-n-inv-log2 = <2>; |
| adi,rfb-ohms = <1>; |
| }; |
| }; |
| }; |
| }; |
| ... |
