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

[ 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.

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 <redacted>

  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 <redacted>

  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