linux-kernel - Re: [PATCH 3/7] pwm: jz4740: Drop dependency on MACH

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Date:   Mon, 12 Aug 2019 08:09:21 +0200
From:   Uwe Kleine-König 
        <u.kleine-koenig@...gutronix.de>
To:     Paul Cercueil <paul@...pouillou.net>
Cc:     Thierry Reding <thierry.reding@...il.com>, od@...c.me,
        linux-pwm@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 3/7] pwm: jz4740: Drop dependency on MACH_INGENIC

On Fri, Aug 09, 2019 at 11:40:59PM +0200, Paul Cercueil wrote:
> 
> 
> Le ven. 9 août 2019 à 18:41, Uwe =?iso-8859-1?q?Kleine-K=F6nig?=
> <u.kleine-koenig@...gutronix.de> a écrit :
> > On Fri, Aug 09, 2019 at 02:30:27PM +0200, Paul Cercueil wrote:
> > >  Depending on MACH_INGENIC prevent us from creating a generic kernel
> > > that
> > >  works on more than one MIPS board. Instead, we just depend on MIPS
> > > being
> > >  set.
> > > 
> > >  Signed-off-by: Paul Cercueil <paul@...pouillou.net>
> > >  ---
> > >   drivers/pwm/Kconfig | 2 +-
> > >   1 file changed, 1 insertion(+), 1 deletion(-)
> > > 
> > >  diff --git a/drivers/pwm/Kconfig b/drivers/pwm/Kconfig
> > >  index d2557c6fcf65..82a75e0b72e5 100644
> > >  --- a/drivers/pwm/Kconfig
> > >  +++ b/drivers/pwm/Kconfig
> > >  @@ -224,7 +224,7 @@ config PWM_IMX_TPM
> > > 
> > >   config PWM_JZ4740
> > >   	tristate "Ingenic JZ47xx PWM support"
> > >  -	depends on MACH_INGENIC
> > >  +	depends on MIPS
> > 
> > If this isn't actually useful on MIPS without MACH_INGENIC this is
> > better expressed using:
> > 
> > 	depends on MIPS
> > 	depends on MACH_INGENIC || COMPILE_TEST
> > 
> > This way some configuring a mips kernel without INGENIC isn't bothered
> > by this question.
> 
> As said in the commit message, it is useful on MIPS without MACH_INGENIC,
> if you want to create a generic kernel that works on more than one MIPS
> board.

Ah, mips is different than arm here. If you configure a generic kernel
that supports arm/imx and some others the Kconfig settings for imx are still
available. Would it make more sense to do:

	depends on MACH_INGENIC || MIPS_GENERIC || COMPILE_TEST

then? Or switch mips to the (IMHO) more intuitive approach that is taken
by arm, too? (i.e. ensure that MACH_INGENIC is =y for both a generic
kernel that supports this machine type among others and a tailored
kernel that only supports Ingenic.)

Best regards
Uwe

-- 
Pengutronix e.K.                           | Uwe Kleine-König            |
Industrial Linux Solutions                 | http://www.pengutronix.de/  |