linux-kernel - Re: [PATCH v4 4/5] dt-bindings: iio: dac: Add adi,ltc2672.yaml

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Date: Sun, 23 Jun 2024 14:43:39 +0100
From: Jonathan Cameron <jic23@...nel.org>
To: Conor Dooley <conor@...nel.org>
Cc: Kim Seer Paller <kimseer.paller@...log.com>,
 linux-kernel@...r.kernel.org, linux-iio@...r.kernel.org,
 devicetree@...r.kernel.org, David Lechner <dlechner@...libre.com>,
 Lars-Peter Clausen <lars@...afoo.de>, Liam Girdwood <lgirdwood@...il.com>,
 Mark Brown <broonie@...nel.org>, Dimitri Fedrau <dima.fedrau@...il.com>,
 Krzysztof Kozlowski <krzk+dt@...nel.org>, Rob Herring <robh@...nel.org>,
 Conor Dooley <conor+dt@...nel.org>, Michael Hennerich
 <michael.hennerich@...log.com>, Nuno Sá
 <noname.nuno@...il.com>
Subject: Re: [PATCH v4 4/5] dt-bindings: iio: dac: Add adi,ltc2672.yaml

On Wed, 19 Jun 2024 18:57:59 +0100
Conor Dooley <conor@...nel.org> wrote:

> On Wed, Jun 19, 2024 at 02:49:03PM +0800, Kim Seer Paller wrote:
> > +patternProperties:
> > +  "^channel@[0-4]$":
> > +    type: object
> > +    additionalProperties: false
> > +
> > +    properties:
> > +      reg:
> > +        description: The channel number representing the DAC output channel.
> > +        maximum: 4
> > +
> > +      adi,toggle-mode:
> > +        description:
> > +          Set the channel as a toggle enabled channel. Toggle operation enables
> > +          fast switching of a DAC output between two different DAC codes without
> > +          any SPI transaction.
> > +        type: boolean
> > +
> > +      adi,output-range-microamp:
> > +        description: Specify the channel output full scale range.
> > +        enum: [3125000, 6250000, 12500000, 25000000, 50000000, 100000000,
> > +               200000000, 300000000]  
> 
> IIO folks, is this sort of thing common/likely to exist on other DACs?

Fair point. It is probably time to conclude this is at least moderately common
and generalize it - which will need a dac.yaml similar to the one we have for
ADCs in adc/adc.yaml.  That will need to make this a per channel node
property (same as the adc ones).
 
I'd also expect it to always take 2 values. In many cases the first will be 0
but that is fine.

Jonathan