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SubjectRe: [PATCH v3 2/2] dt-bindings: iio: dac: Add docs for AD5770R DAC
On Thu, 13 Feb 2020 13:39:16 +0200
Alexandru Tachici <alexandru.tachici@analog.com> wrote:

> Adding dt-bindings documentation for AD5770R DAC.
>
> Signed-off-by: Mircea Caprioru <mircea.caprioru@analog.com>
> Signed-off-by: Alexandru Tachici <alexandru.tachici@analog.com>
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@analog.com>
> +
> +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>;
> + };
> + };
> + };
> +...

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