linux-kernel - Re: [PATCH 6/9] [media] ir-rx51: fix clock API related build issues

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Date:	Wed, 6 Mar 2013 09:16:13 -0800
From:	Tony Lindgren <tony@...mide.com>
To:	Timo Kokkonen <timo.t.kokkonen@....fi>
Cc:	Mauro Carvalho Chehab <mchehab@...hat.com>,
	Arnd Bergmann <arnd@...db.de>, linux-kernel@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org, arm@...nel.org,
	Laurent Pinchart <laurent.pinchart@...asonboard.com>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	linux-media@...r.kernel.org
Subject: Re: [PATCH 6/9] [media] ir-rx51: fix clock API related build issues

* Timo Kokkonen <timo.t.kokkonen@....fi> [130305 22:26]:
> On 03.05 2013 17:09:53, Tony Lindgren wrote:
> > * Mauro Carvalho Chehab <mchehab@...hat.com> [130305 16:28]:
> > > Em Tue,  5 Mar 2013 23:16:46 +0100
> > > Arnd Bergmann <arnd@...db.de> escreveu:
> > > 
> > > > OMAP1 no longer provides its own clock interfaces since patch
> > > > a135eaae52 "ARM: OMAP: remove plat/clock.h". This is great, but
> > > > we now have to convert the ir-rx51 driver to use the generic
> > > > interface from linux/clk.h.
> > > > 
> > > > The driver also uses the omap_dm_timer_get_fclk() function,
> > > > which is not exported for OMAP1, so we have to move the
> > > > definition out of the OMAP2 specific section.
> > > > 
> > > > Signed-off-by: Arnd Bergmann <arnd@...db.de>
> > > > Cc: Mauro Carvalho Chehab <mchehab@...hat.com>
> > > 
> > > From my side:
> > > Acked-by: Mauro Carvalho Chehab <mchehab@...hat.com>
> > 
> > There's just one issue, this driver most likely only needed on
> > rx51 board.. So I suggest we just mark the driver depends on
> > ARCH_OMAP2PLUS and let's drop this patch.
> > 
> > This driver is already disabled for ARCH_MULTIPLATFORM
> > as we need to move dmtimer.c to drivers and have some minimal
> > include/linux/timer-omap.h for it.
> >  
> 
> I've also had this cunning plan that if or when the PWM subsystem
> starts supporting the PWM output in OMAP3, I could convert this driver
> to generate the IR carrier wave through the PWM subsystem and then use
> HR timers to generate the pulses. I think that's much better approach
> than trying to depend on interfaces that are not easily
> available. Should be possible, but I haven't proven yet that it will
> work :)

Sounds good to me.
 
> Unfortunately I haven't got into executing on that plan yet. In
> addition to the challenge of scheduling some of my free time for doing
> this, my RX51 device is not enumerating the USB with the latest kernel
> and I haven't figured out that yet. And because of that, I haven't
> been able to get my user space running over nfsroot setup I've been
> using..

Git bisect might help there. Maybe post the output and cc the usb
people?

Regards,

Tony
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