linux-kernel - Re: [PATCH 1/2] dt-binding: iio: dac8771: Add TI DAC8771 binding

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Date:   Fri, 3 Jan 2020 07:22:11 -0600
From:   Dan Murphy <dmurphy@...com>
To:     Jonathan Cameron <jic23@...nel.org>
CC:     <linux-iio@...r.kernel.org>, <knaack.h@....de>, <lars@...afoo.de>,
        <pmeerw@...erw.net>, <linux-kernel@...r.kernel.org>,
        Rob Herring <robh+dt@...nel.org>
Subject: Re: [PATCH 1/2] dt-binding: iio: dac8771: Add TI DAC8771 binding

Jonathan

Thanks for the review.  I was on holiday

On 12/23/19 8:44 AM, Jonathan Cameron wrote:
> On Tue, 17 Dec 2019 08:07:30 -0600
> Dan Murphy <dmurphy@...com> wrote:
>
>> Add the TI DAC8771 DT binding.
>>
>> Datasheet:
>> http://www.ti.com/lit/ds/symlink/dac8771.pdf
>>
>> Signed-off-by: Dan Murphy <dmurphy@...com>
>> CC: Rob Herring <robh+dt@...nel.org>
>> ---
>>   .../bindings/iio/dac/ti,dac8771.yaml          | 89 +++++++++++++++++++
>>   1 file changed, 89 insertions(+)
>>   create mode 100644 Documentation/devicetree/bindings/iio/dac/ti,dac8771.yaml
>>
>> diff --git a/Documentation/devicetree/bindings/iio/dac/ti,dac8771.yaml b/Documentation/devicetree/bindings/iio/dac/ti,dac8771.yaml
>> new file mode 100644
>> index 000000000000..6aba6789d36c
>> --- /dev/null
>> +++ b/Documentation/devicetree/bindings/iio/dac/ti,dac8771.yaml
>> @@ -0,0 +1,89 @@
>> +# SPDX-License-Identifier: GPL-2.0
> If possible, it is preferred for new bindings to be dual licensed as
>
> (GPL-2.0-only OR BSD-2-Clause)
>
Ack


>> +# Copyright (C) 2019 Texas Instruments Incorporated
>> +%YAML 1.2
>> +---
>> +$id: "http://devicetree.org/schemas/bindings/iio/dac/ti,dac8771.yaml#"
>> +$schema: "http://devicetree.org/meta-schemas/core.yaml#"
>> +
>> +title: Texas Instruments DAC8771
>> +
>> +maintainers:
>> +  - Dan Murphy <dmurphy@...com>
>> +
>> +description: |
>> +  The DAC8771 is a single channel, precision, fully integrated 16-bit digital
>> +  to analog converter (DAC) with adaptive power management, and is designed to
>> +  meet the requirements of industrial control applications.
>> +
>> +  Specifications can be found at:
>> +    http://www.ti.com/lit/ds/symlink/dac8771.pdf
>> +
>> +properties:
>> +  compatible:
>> +    enum:
>> +      - ti,dac8771
>> +
>> +  reg:
>> +    maxItems: 1
>> +
>> +  reset-gpios:
>> +    description: |
>> +       GPIO used for hardware reset.
>> +
>> +  loaddacs-gpios:
>> +    description: |
>> +       GPIO used to shift the data from the SPI FIFO to the processing engine.
>> +
>> +  spi-max-frequency:
>> +    maximum: 25000000
>> +
>> +  vref-supply:
>> +    description: Phandle to the external reference voltage supply.
>> +
>> +  ti,output-range:
>> +    description: Output range of the DAC
>> +       0 - Voltage output 0 to +5 V (default)
> Hmm. I'm never keen on opaque bindings, but sometimes things
> are just too complex to break out as individual fields.
>
> So I guess this is the best we can do.

Yes that is true.  These values are the same as the ones in the data sheet.

It would have been a simpler binding if the current values were not 
nested with the voltage values.

Dan