linux-kernel - Re: [PATCH] iio: dac: ad9739a: drop COMPILE

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Date: Wed, 29 May 2024 10:09:28 +0200
From: Nuno Sá <noname.nuno@...il.com>
To: Arnd Bergmann <arnd@...db.de>, Arnd Bergmann <arnd@...nel.org>, Jonathan
 Cameron <jic23@...nel.org>
Cc: Lars-Peter Clausen <lars@...afoo.de>, Nuno Sá
 <nuno.sa@...log.com>, Dragos Bogdan <dragos.bogdan@...log.com>, Anshul
 Dalal <anshulusr@...il.com>, Andrea Collamati <andrea.collamati@...il.com>,
  linux-iio@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] iio: dac: ad9739a: drop COMPILE_TEST option

On Wed, 2024-05-29 at 09:23 +0200, Arnd Bergmann wrote:
> On Wed, May 29, 2024, at 09:20, Nuno Sá wrote:
> > On Tue, 2024-05-28 at 14:12 +0200, Arnd Bergmann wrote:
> > > From: Arnd Bergmann <arnd@...db.de>
> > > 
> > > Build testing without SPI results in a warning:
> > > 
> > > WARNING: unmet direct dependencies detected for REGMAP_SPI
> > >   Depends on [n]: SPI [=n]
> > >   Selected by [m]:
> > >   - AD9739A [=m] && IIO [=m] && (SPI [=n] || COMPILE_TEST [=y])
> > > 
> > > There is no need for this particular COMPILE_TEST option, as allmodconfig
> > > and randconfig testing can just assume that SPI is enabled separately.
> > > 
> > > Drop it to avoid the warning.
> > > 
> > > Signed-off-by: Arnd Bergmann <arnd@...db.de>
> > > ---
> > 
> > Reviewed-by: Nuno Sa <nuno.sa@...log.com>
> > 
> > Only for my understanding. When does COMPILE_TEST makes sense to add?
> 
> The most common use is to enable building a driver
> that is platform specific on x86 allmodconfig
> or on randconfig, e.g.
> 
> config LPC18XX_DAC
>         tristate "NXP LPC18xx DAC driver"
>         depends on ARCH_LPC18XX || COMPILE_TEST
>         depends on HAS_IOMEM
> 
> Since ARCH_LPC18XX is only visible on arch/arm, the
> driver would never be build tested on anything else
> without the ||COMPILE_TEST.

Makes sense... Thanks!

- Nuno Sá