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

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Date: Tue, 25 Jun 2024 15:51:27 +0000
From: "Paller, Kim Seer" <KimSeer.Paller@...log.com>
To: Jonathan Cameron <Jonathan.Cameron@...wei.com>,
        Conor Dooley
	<conor@...nel.org>
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



> -----Original Message-----
> From: Jonathan Cameron <Jonathan.Cameron@...wei.com>
> Sent: Tuesday, June 25, 2024 1:38 AM
> To: Conor Dooley <conor@...nel.org>
> Cc: Paller, Kim Seer <KimSeer.Paller@...log.com>; Jonathan Cameron
> <jic23@...nel.org>; 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 Mon, 24 Jun 2024 18:00:24 +0100
> Conor Dooley <conor@...nel.org> wrote:
> 
> > 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.
> 
> Yes, that would great.

I was wondering who would be the designated maintainer for new dac.yaml?

> >
> > > this mean somehow removing these common properties from existing DAC
> bindings?
> >
> > I think that that one is up to Jonathan.
> 
> We can deprecate them.  At somepoint we can remove them form the
> documented bindings
> but we will need to keep them in drivers forever (which won't be costly in this
> case).
> 
> Jonathan
> 
> >
> > > > I'd also expect it to always take 2 values. In many cases the first will be 0
> but
> > > > that is fine.
> > > >
> > > > Jonathan
> > >
> >