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

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Date:   Fri, 23 Dec 2022 13:52:09 -0500
From:   Hugo Villeneuve <hugo@...ovil.com>
To:     Jonathan Cameron <jic23@...nel.org>
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 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 :)

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.

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.
> 
> 


-- 
Hugo Villeneuve <hugo@...ovil.com>