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Re: [PATCH] pwm: Get rid of HAVE_PWM

To: Lars-Peter Clausen <lars@metafoo.de>
Subject: Re: [PATCH] pwm: Get rid of HAVE_PWM
From: Thierry Reding <thierry.reding@avionic-design.de>
Date: Thu, 4 Oct 2012 21:13:08 +0200
Cc: linux-kernel@vger.kernel.org, Russell King <linux@arm.linux.org.uk>, Shawn Guo <shawn.guo@linaro.org>, Eric Miao <eric.y.miao@gmail.com>, Haojian Zhuang <haojian.zhuang@gmail.com>, Ralf Baechle <ralf@linux-mips.org>, Dmitry Torokhov <dmitry.torokhov@gmail.com>, Bryan Wu <bryan.wu@canonical.com>, Richard Purdie <rpurdie@rpsys.net>, Samuel Ortiz <sameo@linux.intel.com>, Ashish Jangam <ashish.jangam@kpitcummins.com>, Andrew Jones <drjones@redhat.com>, linux-arm-kernel@lists.infradead.org, linux-mips@linux-mips.org, linux-input@vger.kernel.org, linux-leds@vger.kernel.org
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References: <1349330819-11924-1-git-send-email-thierry.reding@avionic-design.de> <506DA487.9070400@metafoo.de> <20121004182931.GA7228@avionic-0098.mockup.avionic-design.de> <506DDA16.8070604@metafoo.de>
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On Thu, Oct 04, 2012 at 08:48:54PM +0200, Lars-Peter Clausen wrote:
> On 10/04/2012 08:29 PM, Thierry Reding wrote:
> > On Thu, Oct 04, 2012 at 05:00:23PM +0200, Lars-Peter Clausen wrote:
> >> On 10/04/2012 08:06 AM, Thierry Reding wrote:
> >>> [...]
> >>> diff --git a/arch/mips/Kconfig b/arch/mips/Kconfig
> >>> index 331d574..b38f23d 100644
> >>> --- a/arch/mips/Kconfig
> >>> +++ b/arch/mips/Kconfig
> >>> @@ -219,7 +219,8 @@ config MACH_JZ4740
> >>>   select GENERIC_GPIO
> >>>   select ARCH_REQUIRE_GPIOLIB
> >>>   select SYS_HAS_EARLY_PRINTK
> >>> - select HAVE_PWM
> >>> + select PWM
> >>> + select PWM_JZ4740
> >>>   select HAVE_CLK
> >>>   select GENERIC_IRQ_CHIP
> >>
> >> I'm not sure if this is such a good idea, not all jz4740 based board
> >> necessarily require PWM.
> > 
> > This really only restores previous behaviour. But I agree that this is
> > potentially not what we want. Maybe we should just not select this for
> > any boards but rather leave it up to some default configuration. If so
> > the patch can be made simpler by just removing the HAVE_PWM entries.
> 
> At least for JZ4740 I think that is the better solution.

Okay, I'll give other people the chance to comment on this. Especially
for PXA there are many boards that use the PWM for backlight and it
would be interesting to hear from them how they want this to be handled.

Thierry

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