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Date: Sat, 21 Mar 2020 10:38:05 +0000
From: Jonathan Cameron <jic23@...nel.org>
To: Rob Herring <robh@...nel.org>
Cc: Alexandru Tachici <alexandru.tachici@...log.com>,
linux-iio@...r.kernel.org, linux-kernel@...r.kernel.org,
Mircea Caprioru <mircea.caprioru@...log.com>
Subject: Re: [PATCH v4 2/2] dt-bindings: iio: dac: Add docs for AD5770R DAC
On Thu, 19 Mar 2020 18:49:22 -0600
Rob Herring <robh@...nel.org> wrote:
> On Tue, Feb 18, 2020 at 02:10:31PM +0200, Alexandru Tachici wrote:
> > Adding dt-bindings documentation for AD5770R DAC.
>
> DT list needs to be Cc'ed if you want bindings reviewed.
Doh. I missed that.
>
> > Signed-off-by: Mircea Caprioru <mircea.caprioru@...log.com>
> > Signed-off-by: Alexandru Tachici <alexandru.tachici@...log.com>
> > ---
> > .../bindings/iio/dac/adi,ad5770r.yaml | 185 ++++++++++++++++++
> > 1 file changed, 185 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..13d6b5ff479d
> > --- /dev/null
> > +++ b/Documentation/devicetree/bindings/iio/dac/adi,ad5770r.yaml
> > @@ -0,0 +1,185 @@
> > +# SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause)
> > +# Copyright 2020 Analog Devices Inc.
> > +%YAML 1.2
> > +---
> > +$id: http://devicetree.org/schemas/bindings/iio/adc/adi,ad5770r.yaml#
>
> Jonathan mentioned 'adc' part, but 'bindings' is also wrong. Should be:
Alexandru, please send a fixup patch for the various things Rob has highlighted.
Jonathan
>
> .../schemas/iio/dac/...
>
> > +$schema: http://devicetree.org/meta-schemas/core.yaml#
> > +
> > +title: Analog Devices AD5770R DAC device driver
> > +
> > +maintainers:
> > + - Mircea Caprioru <mircea.caprioru@...log.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. Represents two different supplies in 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:
>
> channel@0 ???
>
> Once you fix that, your example will start failing.
>
> > + 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:
>
> Use 'reg' instead.
>
> > + description: This represents the channel number.
> > + items:
>
> You can drop items.
>
> > + const: 0
> > +
> > + adi,range-microamp:
> > + description: Output range of the channel.
> > + oneOf:
> > + - $ref: /schemas/types.yaml#/definitions/int32-array
>
> *-microamp already has a type, so this should be dropped. However, I
> believe it's unsigned currently, but we can fix it to be signed.
>
> > + - items:
> > + - enum: [0 300000]
> > + - enum: [-60000 0]
> > + - enum: [-60000 300000]
>
> Negative values don't yet work until we fix dtc to be able to output
> negative values. For now, can you just avoid negative numbers in the
> example.
>
> What's defined here doesn't match the example. You are saying there are
> 3 cells with 2 possible values each. I think you want:
>
> oneOf:
> - items:
> - const: 0
> - const: 300000
> - items:
> - const: -60000
> - const: 0
> - items:
> - const: -60000
> - const: 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>;
> > + };
> > + };
> > + };
> > +...
> > --
> > 2.20.1
> >
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