linux-toradex.git/drivers/gpio/gpiolib.c, branch v6.6-rc1

Merge tag 'gpio-updates-for-v6.6' of git://git.kernel.org/pub/scm/linux/kernel/git/brgl/linux

2023-08-29T17:21:56+00:00

Pull gpio updates from Bartosz Golaszewski:
 "We have a lot of code refactoring using common helpers and ended up
  removing more lines then we're adding this release cycle.

  Nothing really stands out, just small updates all over the place.

  Core GPIOLIB updates:
   - wake-up poll() in user-space on device unbind
   - improve fwnode usage
   - interrupt domain handling improvements
   - correctly handle the ngpios property in gpio-mmio

  Driver cleanups:
   - remove unneeded calls to platform_set_drvdata() all around the
     place
   - remove unneeded of_match_ptr() expansions whenever a driver depends
     on CONFIG_OF
   - remove redundant calls to dev_err_probe() from gpio-omap and
     gpio-davinci

  Driver improvements:
   - use autopointers and guards from cleanup.h in gpio-sim
   - shrink code in gpio-sim using some common helpers
   - convert the idio family of drivers to using gpio-regmap
   - convert gpio-ws16c48 to using gpio-regmap
   - use devres to simplify code in gpio-pisosr and gpio-mxc
   - update gpio-sifive: support IRQ wake, improve interrupt handling,
     allow building as module
   - make gpio-ge and gpio-bcm-kona OF-independent (plus some minor
     tweaks)
   - add support for new models in gpio-pca953x and gpio-ds4520
   - add runtime PM support to gpio-mxc
   - fix a build warning in gpio-mxs
   - add support for adding pin ranges to gpio-mlxbf3
   - add counter/timer support to gpio-104-dio-48e
   - switch to dynamic GPIO base allocation in gpio-vf610
   - minor oneliners here and there

  Device-tree bindings updates:
   - enable the gpio-line-names property in snps,dw-apb and STMPE GPIO
   - document new models in fsl-imx-gpio, ds4520 and pca95xx
   - convert the bindings for brcm,kona-gpio to YAML"

* tag 'gpio-updates-for-v6.6' of git://git.kernel.org/pub/scm/linux/kernel/git/brgl/linux: (94 commits)
  gpio: pca953x: add support for TCA9538
  dt-bindings: gpio: pca95xx: document new tca9538 chip
  gpio: pca953x: Use i2c_get_match_data()
  gpio: mlxbf3: use capital "OR" for multiple licenses in SPDX
  gpio: pcf857x: Extend match data support for OF tables
  gpio: vf610: switch to dynamic allocat GPIO base
  gpiolib: provide and use gpiod_line_state_notify()
  gpio: cdev: wake up lineevent poll() on device unbind
  gpio: cdev: wake up linereq poll() on device unbind
  gpio: cdev: wake up chardev poll() on device unbind
  gpiolib: add a second blocking notifier to struct gpio_device
  gpio: cdev: open-code to_gpio_chardev_data()
  gpiolib: rename the gpio_device notifier
  gpio: mlxbf3: Support add_pin_ranges()
  gpio: mxc: Use helper function devm_clk_get_optional_enabled()
  gpio: pca9570: fix kerneldoc
  gpio: sim: simplify code with cleanup helpers
  gpio: sim: replace memmove() + strstrip() with skip_spaces() + strim()
  gpio: sim: simplify gpio_sim_device_config_live_store()
  gpio: mxc: release the parent IRQ in runtime suspend
  ...

gpiolib: provide and use gpiod_line_state_notify()

2023-08-22T07:37:46+00:00

Wrap the calls to blocking_notifier_call_chain() for the line state
notifier with a helper that allows us to use fewer lines of code and
simpler syntax.

Signed-off-by: Bartosz Golaszewski 
Reviewed-by: Andy Shevchenko

gpiolib: add a second blocking notifier to struct gpio_device

2023-08-21T13:57:05+00:00

Add a new blocking notifier to struct gpio_device and use it to notify
subscribers about the GPIO device being unregistered from the device
model.

Signed-off-by: Bartosz Golaszewski 
Reviewed-by: Linus Walleij 
Reviewed-by: Kent Gibson

gpiolib: rename the gpio_device notifier

2023-08-21T13:57:05+00:00

Change the generic "notifier" name to "line_state_notifier" in order to
reflect its purpose in preparation for adding a second notifier which
will be used to notify wait queues about device unregistering.

Signed-off-by: Bartosz Golaszewski 
Reviewed-by: Linus Walleij 
Reviewed-by: Kent Gibson

gpiolib: fix reference leaks when removing GPIO chips still in use

2023-08-16T11:35:50+00:00

After we remove a GPIO chip that still has some requested descriptors,
gpiod_free_commit() will fail and we will never put the references to the
GPIO device and the owning module in gpiod_free().

Rework this function to:
- not warn on desc == NULL as this is a use-case on which most free
  functions silently return
- put the references to desc->gdev and desc->gdev->owner unconditionally
  so that the release callback actually gets called when the remaining
  references are dropped by external GPIO users

Signed-off-by: Bartosz Golaszewski 
Reviewed-by: Linus Walleij

gpio: mmio: handle "ngpios" properly in bgpio_init()

2023-07-18T18:59:25+00:00

bgpio_init() uses "sz" argument to populate ngpio, which is not
accurate. Instead, read the "ngpios" property from the DT and if it
doesn't exist, use the "sz" argument. With this change, drivers no
longer need to overwrite the ngpio variable after calling bgpio_init().

If the "ngpios" property is specified, bgpio_bits is calculated
as the round up value of ngpio. At the moment, the only requirement
specified is that the round up value must be a multiple of 8 but
it should also be a power of 2 because we provide accessors based
on the bank size in bgpio_setup_accessors().

Signed-off-by: Asmaa Mnebhi 
Reviewed-by: Andy Shevchenko 
Reviewed-by: Linus Walleij 
Signed-off-by: Bartosz Golaszewski

gpiolib: Replace open coded gpiochip_irqchip_add_allocated_domain()

2023-07-10T09:29:47+00:00

Replace open coded variant of gpiochip_irqchip_add_allocated_domain()
in gpiochip_add_irqchip().

Signed-off-by: Andy Shevchenko 
Reviewed-by: Linus Walleij 
Signed-off-by: Bartosz Golaszewski

gpiolib: Split out gpiochip_irqchip_add_allocated_domain() helper

2023-07-10T09:29:45+00:00

The gpiochip_irqchip_add_allocated_domain() can be used
in another place in the code.

Signed-off-by: Andy Shevchenko 
Reviewed-by: Linus Walleij 
Signed-off-by: Bartosz Golaszewski

gpiolib: Do not assign error pointer to the GPIO IRQ chip domain

2023-07-10T09:29:44+00:00

Check domain for being an error pointer before assigning it to
the GPIO IRQ chip domain.

Signed-off-by: Andy Shevchenko 
Reviewed-by: Linus Walleij 
Signed-off-by: Bartosz Golaszewski

gpiolib: Factor out gpiochip_simple_create_domain()

2023-07-10T09:29:43+00:00

As a preparatory patch and for the sake of consistency,
factor out gpiochip_simple_create_domain().

Signed-off-by: Andy Shevchenko 
Reviewed-by: Linus Walleij 
Signed-off-by: Bartosz Golaszewski