Re: [PATCH v3 2/2] dt-bindings: iio: dac: Add docs for AD5770R DAC

[Jonathan Cameron]

On Thu, 13 Feb 2020 13:39:16 +0200
Alexandru Tachici <alexandru.tachici@xxxxxxxxxx> wrote:

> Adding dt-bindings documentation for AD5770R DAC.
> 
> Signed-off-by: Mircea Caprioru <mircea.caprioru@xxxxxxxxxx>
> Signed-off-by: Alexandru Tachici <alexandru.tachici@xxxxxxxxxx>
One comment inline.  I'd also like to leave this to give time for
DT maintainer to review.

Thanks,

Jonathan

> ---
>  .../bindings/iio/dac/adi,ad5770r.yaml         | 188 ++++++++++++++++++
>  1 file changed, 188 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/iio/dac/adi,ad5770r.yaml
> 
> diff --git a/Documentation/devicetree/bindings/iio/dac/adi,ad5770r.yaml b/Documentation/devicetree/bindings/iio/dac/adi,ad5770r.yaml
> new file mode 100644
> index 000000000000..37b674caebfb
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/iio/dac/adi,ad5770r.yaml
> @@ -0,0 +1,188 @@
> +# SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause)
> +# Copyright 2020 Analog Devices Inc.
> +%YAML 1.2
> +---
> +$id: http://devicetree.org/schemas/bindings/iio/adc/adi,ad5770r.yaml#
> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> +
> +title: Analog Devices AD5770R DAC device driver
> +
> +maintainers:
> +  - Mircea Caprioru <mircea.caprioru@xxxxxxxxxx>
> +
> +description: |
> +  Bindings for the Analog Devices AD5770R current DAC device. Datasheet can be
> +  found here:
> +    https://www.analog.com/media/en/technical-documentation/data-sheets/AD5770R.pdf
> +
> +properties:
> +  compatible:
> +    enum:
> +      - adi,ad5770r
> +
> +  reg:
> +    maxItems: 1
> +
> +  avdd-supply:
> +    description:
> +      AVdd voltage supply.
> +
> +  dvdd-supply:
> +    description:
> +      DVdd voltage supply. Must have same voltage as avdd-supply.
Hmm. That is an oddity.  In the chips case this reflects physical pins
from a binding point of view, the only option will be to connect them
to the same regulator.   Hence I'd just have a single supply to
cover both of these.  Add a note in the connect on which ever one
you keep to say that it represents 2 different supplies listed on the
datasheet that are in fact the same. 

> +
> +  iovdd-supply:
> +    description:
> +      Voltage supply for the chip interface.
> +
> +  vref-supply:
> +    description: Specify the voltage of the external reference used.
> +      Available reference options are 1.25 V or 2.5 V. If no
> +      external reference declared then the device will use the
> +      internal reference of 1.25 V.
> +
> +  adi,external-resistor:
> +    description: Specify if an external 2.5k ohm resistor is used. If not
> +      specified the device will use an internal 2.5k ohm resistor.
> +      The precision resistor is used for reference current generation.
> +    type: boolean
> +
> +  reset-gpios:
> +    description: GPIO spec for the RESET pin. If specified, it will be
> +      asserted during driver probe.
> +    maxItems: 1
> +
> +  channel0:
> +    description: Represents an external channel which are
> +      connected to the DAC. Channel 0 can act both as a current
> +      source and sink.
> +    type: object
> +
> +    properties:
> +      num:
> +        description: This represents the channel number.
> +        items:
> +          const: 0
> +
> +      adi,range-microamp:
> +          description: Output range of the channel.
> +          oneOf:
> +            - $ref: /schemas/types.yaml#/definitions/int32-array
> +            - items:
> +                - enum: [0 300000]
> +                - enum: [-60000 0]
> +                - enum: [-60000 300000]
> +
> +  channel1:
> +    description: Represents an external channel which are
> +      connected to the DAC.
> +    type: object
> +
> +    properties:
> +      num:
> +        description: This represents the channel number.
> +        items:
> +          const: 1
> +
> +      adi,range-microamp:
> +          description: Output range of the channel.
> +          oneOf:
> +            - $ref: /schemas/types.yaml#/definitions/uint32-array
> +            - items:
> +                - enum: [0 140000]
> +                - enum: [0 250000]
> +
> +  channel2:
> +    description: Represents an external channel which are
> +      connected to the DAC.
> +    type: object
> +
> +    properties:
> +      num:
> +        description: This represents the channel number.
> +        items:
> +          const: 2
> +
> +      adi,range-microamp:
> +          description: Output range of the channel.
> +          oneOf:
> +            - $ref: /schemas/types.yaml#/definitions/uint32-array
> +            - items:
> +                - enum: [0 140000]
> +                - enum: [0 250000]
> +
> +patternProperties:
> +  "^channel@([3-5])$":
> +    type: object
> +    description: Represents the external channels which are connected to the DAC.
> +    properties:
> +      num:
> +        description: This represents the channel number.
> +        items:
> +          minimum: 3
> +          maximum: 5
> +
> +      adi,range-microamp:
> +          description: Output range of the channel.
> +          oneOf:
> +            - $ref: /schemas/types.yaml#/definitions/uint32-array
> +            - items:
> +                - enum: [0 45000]
> +                - enum: [0 100000]
> +
> +required:
> +- reg
> +- diff-channels
> +- channel0
> +- channel1
> +- channel2
> +- channel3
> +- channel4
> +- channel5
> +
> +examples:
> +  - |
> +        spi {
> +                #address-cells = <1>;
> +                #size-cells = <0>;
> +
> +                ad5770r@0 {
> +                        compatible = "ad5770r";
> +                        reg = <0>;
> +                        spi-max-frequency = <1000000>;
> +                        vref-supply = <&vref>;
> +                        adi,external-resistor;
> +                        reset-gpios = <&gpio 22 0>;
> +
> +                        channel@0 {
> +                                num = <0>;
> +                                adi,range-microamp = <(-60000) 300000>;
> +                        };
> +
> +                        channel@1 {
> +                                num = <1>;
> +                                adi,range-microamp = <0 140000>;
> +                        };
> +
> +                        channel@2 {
> +                                num = <2>;
> +                                adi,range-microamp = <0 55000>;
> +                        };
> +
> +                        channel@3 {
> +                                num = <3>;
> +                                adi,range-microamp = <0 45000>;
> +                        };
> +
> +                        channel@4 {
> +                                num = <4>;
> +                                adi,range-microamp = <0 45000>;
> +                        };
> +
> +                        channel@5 {
> +                                num = <5>;
> +                                adi,range-microamp = <0 45000>;
> +                        };
> +                };
> +        };
> +...