linux-kernel - Re: [PATCH v2 1/2] dt-bindings: iio: addac: one-bit-adc-dac yaml documentation

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Date:   Sun, 16 Jan 2022 11:30:56 +0000
From:   Jonathan Cameron <jic23@...nel.org>
To:     Cristian Pop <cristian.pop@...log.com>
Cc:     <linux-iio@...r.kernel.org>, <linux-gpio@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>, <devicetree@...r.kernel.org>,
        <robh+dt@...nel.org>
Subject: Re: [PATCH v2 1/2] dt-bindings: iio: addac: one-bit-adc-dac yaml
 documentation

On Tue, 11 Jan 2022 13:59:18 +0200
Cristian Pop <cristian.pop@...log.com> wrote:

> This adds device tree bindings for the one-bit-adc-dac.

This series really needs a cover letter where you describe in
general terms what the aim is etc.

> 
> Signed-off-by: Cristian Pop <cristian.pop@...log.com>
> V1->V2                                                                     
>  - I am aware of the recommendation of rename/move this driver. Should we  
>    consider "drivers/io/gpio.c"? 

Probably keep with the naming of the hwmon iio bridge and go with
gpio_iio.c to indicate bridge from gpio to iio.

I'll put more general comments in patch 2 review, but I'm very doubtful
that setting this up via dt is giong to be the way forward.
Shall we say, the iio_hwmon bindings have always been controversial and
we'd probably not get away with them today...

Reason being it's policy not wiring and reflects internal Linux subsystem
constructs, not generic things applicable to all operating systems.

                                          
>  - Add .yaml file                                                          
>  - Remove blank lines, remove unnecessary coma                             
>  - Remove macros for channels                                              
>  - Check if channel is input for write_raw                                 
>  - Use labels instead of extend_name                                       
>  - Fix channel indexing                                                    
>  - Use "sizeof(*channels)" in devm_kcalloc()                               
>  - Remove assignment: " indio_dev->dev.parent = &pdev->dev;"               
>  - Remove "platform_set_drvdata"                               
Not in this patch so shouldn't be in this description.            
>  - Remove "adi" from compatible string since is not ADI specific driver.
> ---

Version log here for stuff in this patch.  Fine to have the log in the
cover letter if the changes tend to go across multiple patches (renames etc).

>  .../bindings/iio/addac/one-bit-adc-dac.yaml   | 89 +++++++++++++++++++
>  1 file changed, 89 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/iio/addac/one-bit-adc-dac.yaml
> 
> diff --git a/Documentation/devicetree/bindings/iio/addac/one-bit-adc-dac.yaml b/Documentation/devicetree/bindings/iio/addac/one-bit-adc-dac.yaml
> new file mode 100644
> index 000000000000..dbed0f3b1ca4
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/iio/addac/one-bit-adc-dac.yaml
> @@ -0,0 +1,89 @@
> +# SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause)
> +# Copyright 2020 Analog Devices Inc.
> +%YAML 1.2
> +---
> +$id: http://devicetree.org/schemas/iio/addac/one-bit-adc-dac.yaml#
> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> +
> +title: Analog Devices one bit ADC DAC driver
> +
> +maintainers:
> +  - Cristian Pop <cristian.pop@...log.com>
> +
> +description: |
> +  One bit ADC DAC driver
> +
> +properties:
> +  compatible:
> +    enum:
> +      - adi,one-bit-adc-dac
> +
> +  '#address-cells':
> +    const: 1
> +
> +  '#size-cells':
> +    const: 0
> +
> +  in-gpios:
> +    description: Input GPIOs
> +
> +  out-gpios:
> +    description: Output GPIOs
> +
> +required:
> +  - compatible
> +  - in-gpios
> +  - out-gpios
> +
> +patternProperties:
> +  "^channel@([0-9]|1[0-5])$":
> +    type: object
> +    description: |
> +      Represents the external channels which are connected to the ADDAC.
> +
> +    properties:
> +      reg:
> +        maxItems: 1
> +        description: |
> +          The channel number.
> +
> +      label:
> +        description: |
> +          Unique name to identify which channel this is.
> +
> +    required:
> +      - reg
> +
> +additionalProperties: false
> +
> +examples:
> +  - |
> +    one-bit-adc-dac@0 {
> +        compatible = "one-bit-adc-dac";
> +
> +        #address-cells = <1>;
> +        #size-cells = <0>;
> +
> +        in-gpios = <&gpio 17 0>, <&gpio 27 0>;
> +        out-gpios = <&gpio 23 0>, <&gpio 24 0>;
> +
> +        channel@0 {
> +          reg = <0>;
> +          label = "i_17";
> +        };
> +
> +        channel@1 {
> +          reg = <1>;
> +          label = "i_27";
> +        };
> +
> +        channel@2 {
> +          reg = <2>;
> +          label = "o_23";
> +        };
> +
> +        channel@3 {
> +          reg = <3>;
> +          label = "o_24";
> +        };
> +    };