linux-kernel - [PATCH 00/15 v3] Regulator ena

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Date:   Wed,  5 Dec 2018 13:47:06 +0100
From:   Linus Walleij <linus.walleij@...aro.org>
To:     Liam Girdwood <lgirdwood@...il.com>,
        Mark Brown <broonie@...nel.org>
Cc:     linux-kernel@...r.kernel.org,
        Charles Keepax <ckeepax@...nsource.cirrus.com>,
        Bartosz Golaszewski <bgolaszewski@...libre.com>,
        Marek Szyprowski <m.szyprowski@...sung.com>,
        Linus Walleij <linus.walleij@...aro.org>
Subject: [PATCH 00/15 v3] Regulator ena_gpiod fixups

Here is a third iteration of these fixups after thinking
over Marek's remarks on the v2 version.

Also available in git branch
gpio-descriptors-regulator-fixup in the GPIO git tree:
https://git.kernel.org/pub/scm/linux/kernel/git/linusw/linux-gpio.git/log/?h=gpio-descriptors-regulator-fixup

I added two fixup item to the list: making the gpiod
from of node respect nonexlusive flags and fixing the
shared regulators in devm_gpiod_get*.

To make sure GPIO descriptors are never left dangling
(as far as I can tell!) I use this stepwise approach:

1. Fix the regulator_register() in the core to guarantee
   that after calling this with a valid GPIO descriptor
   in ena_gpiod it will be gpiod_put() if there is any
   problem.

2. Fix up simple descriptor consumers to just gpiod_get()
   and let the core take over the descriptor. Only handle
   the errorpath up to this point.

3. Export gpiod_get_from_of_node() and let max77686
   obtain a GPIO descriptor from the device tree without
   any devres make-up in the DT parsing callback.

4. Make gpiod_get_from_of_node() respect the
   GPIOD_FLAGS_BIT_NONEXCLUSIVE flag.

5. Fix up devm_gpiod_get_* to respect the
   GPIOD_FLAGS_BIT_NONEXCLUSIVE flag.

6. Invent devm_gpiod_unhinge() that will remove the devres
   monitoring of a devm_* allocated GPIO descriptor
   right before handling it over to the regulator core,
   and use this in the otherwise hairy da9211,
   s5m8767, tps65090 and s2mps11 drivers.

Linus Walleij (15):
  regulator: core: Track dangling GPIO descriptors
  regulator: fixed: Let core handle GPIO descriptor
  regulator: lm363x: Let core handle GPIO descriptor
  regulator: lp8788-ldo: Let core handle GPIO descriptor
  regulator: max8952: Let core handle GPIO descriptor
  regulator: max8973: Let core handle GPIO descriptor
  gpio: Export gpiod_get_from_of_node()
  regulator: max77686: Let core handle GPIO descriptor
  gpio: Enable nonexclusive gpiods from DT nodes
  gpio: devres: Handle nonexclusive GPIOs
  gpio: Add devm_gpiod_unhinge()
  regulator: da9211: Hand over GPIO to regulator core
  regulator: s5m8767: Hand over GPIO to regulator core
  regulator: tps65090: Hand over GPIO to regulator core
  regulator: s2mps11: Hand over GPIO to regulator core

 Documentation/driver-model/devres.txt  |  1 +
 drivers/gpio/gpiolib-devres.c          | 80 ++++++++++++++++++++++----
 drivers/gpio/gpiolib.c                 |  2 +
 drivers/gpio/gpiolib.h                 |  6 --
 drivers/regulator/core.c               | 55 ++++++++++++++----
 drivers/regulator/da9211-regulator.c   |  6 ++
 drivers/regulator/fixed.c              |  6 +-
 drivers/regulator/lm363x-regulator.c   |  8 ++-
 drivers/regulator/lp8788-ldo.c         |  8 ++-
 drivers/regulator/max77686-regulator.c | 14 +++--
 drivers/regulator/max8952.c            | 10 +++-
 drivers/regulator/max8973-regulator.c  | 23 +++++---
 drivers/regulator/s2mps11.c            |  7 ++-
 drivers/regulator/s5m8767.c            |  9 ++-
 drivers/regulator/tps65090-regulator.c |  6 ++
 include/linux/gpio/consumer.h          | 23 ++++++++
 16 files changed, 214 insertions(+), 50 deletions(-)

-- 
2.19.2