linux-kernel - Re: [PATCH v1 1/3] iio: adc: Kconfig: add SPI interface mention to AD7924 description

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Date:   Fri, 30 Dec 2022 18:03:10 +0000
From:   Jonathan Cameron <jic23@...nel.org>
To:     Hugo Villeneuve <hugo@...ovil.com>
Cc:     hvilleneuve@...onoff.com, lars@...afoo.de, robh+dt@...nel.org,
        krzysztof.kozlowski+dt@...aro.org, linux-iio@...r.kernel.org,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v1 1/3] iio: adc: Kconfig: add SPI interface mention to
 AD7924 description

On Fri, 23 Dec 2022 13:52:09 -0500
Hugo Villeneuve <hugo@...ovil.com> wrote:

> On Fri, 23 Dec 2022 14:12:32 +0000
> Jonathan Cameron <jic23@...nel.org> wrote:
> 
> > On Thu, 22 Dec 2022 15:36:08 -0500
> > Hugo Villeneuve <hugo@...ovil.com> wrote:
> >   
> > > From: Hugo Villeneuve <hvilleneuve@...onoff.com>
> > > 
> > > The Analog Devices AD7924 uses an SPI interface. There is also a Texas
> > > Instruments ADS7924 which uses an I2C interface.
> > > 
> > > Adding the SPI mention to the AD7924 will help to avoid confusion
> > > between the two chips.  
> > Hi Hugo,
> > 
> > Welcome to IIO.
> > 
> > I don't really mind this, but given they have different part numbers
> > and the similarly named TI part could just have easily been SPI
> > I'm not sure the clarification is really useful.
> > 
> > Also, under all the circumstances I can think of, if you can see the
> > help text you can also see the SPI dependence clearly listed.
> > 
> > Hence I think is just noise, though I'm guessing it reflects a
> > confusion you ran into!
> > 
> > Jonathan  
> 
> Hi Jonathan,
> yes, I initially tought that the TI ADS7924 was already supported because of the AD7924 entry. I wrongly assumed that the parts were similar and TI just renamed it because they bought Analog Devices. I am pretty sure that I am not the only one having made a similar error :)
> 

Yikes.  If TI bought ADI that would definitely be big news (my uninformed
guess it it would never get past competition authorities :)

I do vaguely wonder if long term we'll have to start naming drivers
with vendor prefixes as we will eventually get significant naming clashes.
Still I'm not keen to do it until we have a real problem.


> Of course, both chips differ not only because of their interface (SPI vs I2C), but also in their modes of operation and registers, interrupt pin presence (ADS7924), etc.
> 
> But I can drop this patch if you want.

Will do,

Thanks,

Jonathan

> 
> Hugo V.
> 
> 
> 
> > > Signed-off-by: Hugo Villeneuve <hvilleneuve@...onoff.com>
> > > ---
> > >  drivers/iio/adc/Kconfig | 2 +-
> > >  1 file changed, 1 insertion(+), 1 deletion(-)
> > > 
> > > diff --git a/drivers/iio/adc/Kconfig b/drivers/iio/adc/Kconfig
> > > index 46c4fc2fc534..235319546974 100644
> > > --- a/drivers/iio/adc/Kconfig
> > > +++ b/drivers/iio/adc/Kconfig
> > > @@ -243,7 +243,7 @@ config AD7923
> > >  	select IIO_TRIGGERED_BUFFER
> > >  	help
> > >  	  Say yes here to build support for Analog Devices
> > > -	  AD7904, AD7914, AD7923, AD7924 4 Channel ADCs.
> > > +	  AD7904, AD7914, AD7923, AD7924 4 Channel SPI ADCs.
> > >  
> > >  	  To compile this driver as a module, choose M here: the
> > >  	  module will be called ad7923.  
> > 
> >   
> 
>