linux-kernel - Re: [PATCHv2 resend 00/11] improve PWM lookup support without device tree

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Date:	Tue, 20 May 2014 02:55:54 +0200
From:	Laurent Pinchart <laurent.pinchart@...asonboard.com>
To:	Simon Horman <horms@...ge.net.au>
Cc:	Alexandre Belloni <alexandre.belloni@...e-electrons.com>,
	Thierry Reding <thierry.reding@...il.com>,
	Tony Lindgren <tony@...mide.com>,
	Philipp Zabel <philipp.zabel@...il.com>,
	Paul Parsons <lost.distance@...oo.com>,
	Magnus Damm <magnus.damm@...il.com>,
	Eric Miao <eric.y.miao@...il.com>,
	Haojian Zhuang <haojian.zhuang@...il.com>,
	Bryan Wu <cooloney@...il.com>,
	Jingoo Han <jg1.han@...sung.com>,
	Lee Jones <lee.jones@...aro.org>, linux-pwm@...r.kernel.org,
	linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
	linux-omap@...r.kernel.org, linux-sh@...r.kernel.org,
	linux-leds@...r.kernel.org, linux-fbdev@...r.kernel.org
Subject: Re: [PATCHv2 resend 00/11] improve PWM lookup support without device tree

Hi Alexandre and Simon,

On Tuesday 20 May 2014 07:39:13 Simon Horman wrote:
> [ CCed Laurent Pinchart ]
> 
> The renesas and shmobile portions of this seem reasonable to me
> and I have checked that there do not seem to be any conflicts
> with changes I already have queued up for v3.16 (and v3.17).
> 
> I have CCed Laurent Pinchart as I believe he most recently
> did work on the renesas and shmobile code in question.

The series look sane to me. For the three patches that Simon has acked below,

Acked-by: Laurent Pinchart <laurent.pinchart@...asonboard.com>

> On Mon, May 19, 2014 at 10:42:31PM +0200, Alexandre Belloni wrote:
> > Hi,
> > 
> > Originally sent on Apr 14th, note that this series is blocking another 16
> > patches series, I would like it to be taken in 3.16 if we can agree on
> > this implementation.
> > 
> > A patch set as suggested by Thierry to make lookup with the lookup table
> > instead of device tree behave more like when using device tree.
> > 
> > The first patch adds a period and a polarity member to the lookup table
> > and use those to set period and polarity.
> > 
> > Patch 2, 4 and 5 are making use of those new members from the board files.
> > Patch 3 removes useless code since setting the polarity is now handled by
> > the PWM core.
> > 
> > I couldn't decide on a good name for the extended PWM_LOOKUP macro and I
> > believe we won't have to add members to that structure soon so:
> > Patch 6 modifies the PWM_LOOKUP macro to also initialize period and
> > polarity and Patch 7-9 are making use of the new PWM_LOOKUP macro in the
> > board files
> > 
> > Patch 10 and 11 are making the leds-pwm and pwm_bl drivers get the period
> > from the PWM before using pwm_period_ns if it is not already set.
> > 
> > Patch 10 will obviously conflict with the series of Russell reworking the
> > leds-pwm probing. I can rebase if necessary
> > 
> > The final goal would be to get rid of .pwm_period_ns in leds-pwm and
> > pwm_bl after moving all the remaining users (still around 25) to
> > pwm_lookup.
> > 
> > Changes in v2:
> >  - correctly unlock the pwm_lookup_lock mutex before returning.
> >  - don't change PWM_LOOKUP atomically
> >  - remove tpu_pwm_platform_data and the associated header file
> >  - make the leds-pwm and pwm_bl drivers get the period from the PWM
> > 
> > Alexandre Belloni (11):
> >   pwm: add period and polarity to struct pwm_lookup
> >   ARM: shmobile: Armadillo 800 EVA: initialize all struct pwm_lookup
> >     members
> >   pwm: renesas-tpu: remove useless struct tpu_pwm_platform_data
> 
> The above two patches:
> Acked-by: Simon Horman <horms+renesas@...ge.net.au>
> 
> >   ARM: OMAP3: Beagle: initialize all the struct pwm_lookup members
> >   ARM: pxa: hx4700: initialize all the struct pwm_lookup members
> >   pwm: modify PWM_LOOKUP to initialize all struct pwm_lookup members
> >   ARM: OMAP3: Beagle: use PWM_LOOKUP to initialize struct pwm_lookup
> >   ARM: shmobile: Armadillo 800 EVA: use PWM_LOOKUP to initialize struct
> >     pwm_lookup
> 
> The above patch:
> Acked-by: Simon Horman <horms+renesas@...ge.net.au>
> 
> >   ARM: pxa: hx4700: use PWM_LOOKUP to initialize struct pwm_lookup
> >   leds: leds-pwm: retrieve configured pwm period
> >   backlight: pwm_bl: retrieve configured pwm period
> >  
> >  Documentation/pwm.txt                          |  3 ++-
> >  arch/arm/mach-omap2/board-omap3beagle.c        |  3 ++-
> >  arch/arm/mach-pxa/hx4700.c                     |  3 ++-
> >  arch/arm/mach-shmobile/board-armadillo800eva.c | 14 +++-----------
> >  drivers/leds/leds-pwm.c                        |  5 ++++-
> >  drivers/pwm/core.c                             |  8 +++++++-
> >  drivers/pwm/pwm-renesas-tpu.c                  | 19 +++----------------
> >  drivers/video/backlight/pwm_bl.c               |  8 +++++---
> >  include/linux/platform_data/pwm-renesas-tpu.h  | 16 ----------------
> >  include/linux/pwm.h                            |  6 +++++-
> >  10 files changed, 33 insertions(+), 52 deletions(-)
> >  delete mode 100644 include/linux/platform_data/pwm-renesas-tpu.h

-- 
Regards,

Laurent Pinchart

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