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

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Message-ID: <20140521091626.GA21211@ulmo>
Date:	Wed, 21 May 2014 11:16:27 +0200
From:	Thierry Reding <thierry.reding@...il.com>
To:	Alexandre Belloni <alexandre.belloni@...e-electrons.com>
Cc:	Tony Lindgren <tony@...mide.com>,
	Philipp Zabel <philipp.zabel@...il.com>,
	Paul Parsons <lost.distance@...oo.com>,
	Simon Horman <horms@...ge.net.au>,
	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

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
>   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
>   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

I've applied this whole series with some minor fixups (mostly adding
detail to commit messages). Test builds show no breakage, so I've pushed
this to the for-next branch.

Thanks,
Thierry

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