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

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Date: Fri, 28 Jun 2024 20:02:43 +0100
From: Jonathan Cameron <jic23@...nel.org>
To: Conor Dooley <conor@...nel.org>
Cc: "Paller, Kim Seer" <KimSeer.Paller@...log.com>, Jonathan Cameron
 <Jonathan.Cameron@...wei.com>, "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 Tue, 25 Jun 2024 17:20:48 +0100
Conor Dooley <conor@...nel.org> wrote:

> On Tue, Jun 25, 2024 at 03:51:27PM +0000, Paller, Kim Seer wrote:
> > 
> >   
> > > From: Jonathan Cameron <Jonathan.Cameron@...wei.com>  
> 
> > > 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:  
> > > > >
> > > > >  
> > > > > > From: Jonathan Cameron <jic23@...nel.org>  
> 
> > > > > > 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).  
> > > > >
> > > > > 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?  
> 
> I'd suggest Jonathan!

Sure.  Though if anyone else wants to maintain this one they'd be welcome :)

> 
> > > > > 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).  
> 
> Right. Anything where the name _would change_ needs to be deprecated and
> kept forever. I was thinking more about properties that are defined in
> multiple locations with the same name, e.g. if "output-range-microvolts"
> existed in 6 different bindings.
> 
> Thanks,
> Conor.