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

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Date: Mon, 24 Jun 2024 18:00:24 +0100
From: Conor Dooley <conor@...nel.org>
To: "Paller, Kim Seer" <KimSeer.Paller@...log.com>
Cc: Jonathan Cameron <jic23@...nel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-iio@...r.kernel.org" <linux-iio@...r.kernel.org>,
	"devicetree@...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>,
	"Hennerich, Michael" <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 Mon, Jun 24, 2024 at 03:26:26PM +0000, Paller, Kim Seer wrote:
> 
> 
> > -----Original Message-----
> > From: Jonathan Cameron <jic23@...nel.org>
> > Sent: Sunday, June 23, 2024 9:44 PM
> > To: Conor Dooley <conor@...nel.org>
> > Cc: Paller, Kim Seer <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>; Hennerich, Michael
> > <Michael.Hennerich@...log.com>; Nuno Sá <noname.nuno@...il.com>
> > Subject: Re: [PATCH v4 4/5] dt-bindings: iio: dac: Add adi,ltc2672.yaml
> > 
> > [External]
> > 
> > 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).
> 
> Should I proceed with generalizing common DAC properties in this series and does

I think so, yes.

> this mean somehow removing these common properties from existing DAC bindings?

I think that that one is up to Jonathan.

> > I'd also expect it to always take 2 values. In many cases the first will be 0 but
> > that is fine.
> > 
> > Jonathan
> 

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