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Add support for adding GPIs to the event FIFO. This is done by adding
irq_chip support. Like this, one can use the input gpio_keys driver as a
"frontend" device and input handler.
As part of this change, we now implement .request() and .free() as we can't
blindly consume all available pins as GPIOs (example: some pins can be
used for forming a keymap matrix).
Also note that the number of pins can now be obtained from the parent,
top level device. Hence the 'max_gpio' variable can be removed.
Reviewed-by: Linus Walleij <linus.walleij@linaro.org>
Acked-by: Bartosz Golaszewski <bartosz.golaszewski@linaro.org>
Signed-off-by: Nuno Sá <nuno.sa@analog.com>
Link: https://lore.kernel.org/r/20250701-dev-adp5589-fw-v7-15-b1fcfe9e9826@analog.com
Signed-off-by: Lee Jones <lee@kernel.org>
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The ADP558x family supports a built in keypad matrix decoder which can
be added as an Input device. In order to both support the Input and the
GPIO device, we need to create a bitmap of the supported pins and track
their usage since they can either be used as GPIOs (GPIs) or as part of
the keymap.
We also need to mark special pins busy in case some features are being
used (ex: pwm or reset events).
Signed-off-by: Nuno Sá <nuno.sa@analog.com>
Link: https://lore.kernel.org/r/20250701-dev-adp5589-fw-v7-14-b1fcfe9e9826@analog.com
Signed-off-by: Lee Jones <lee@kernel.org>
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The ADP558x family of devices can be programmed to respond to some
especial events, In case of the unlock events, one can lock the keypad
and use KEYS or GPIs events to unlock it. For the reset events, one can
again use a combinations of GPIs/KEYs in order to generate an event that
will trigger the device to generate an output reset pulse.
Signed-off-by: Nuno Sá <nuno.sa@analog.com>
Link: https://lore.kernel.org/r/20250701-dev-adp5589-fw-v7-13-b1fcfe9e9826@analog.com
Signed-off-by: Lee Jones <lee@kernel.org>
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These devices are capable of generate FIFO based events based on KEY or
GPI presses. Add support for handling these events. This is in
preparation of adding full support for keymap and gpis based events.
Reviewed-by: Lee Jones <lee@kernel.org>
Signed-off-by: Nuno Sá <nuno.sa@analog.com>
Link: https://lore.kernel.org/r/20250701-dev-adp5589-fw-v7-12-b1fcfe9e9826@analog.com
Signed-off-by: Lee Jones <lee@kernel.org>
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Add properties related to input events. These devices can act as
keyboards and can support events either via a keymap Matrix or through
GPIs. Note that the device needs to be an interrupt controller for GPIs
based events.
We specifically need a property specifying the pins used by the keymap
matrix since these devices have no requirement for rows and columns to be
contiguous without holes which is enforced by the standard input
properties.
Reviewed-by: "Rob Herring (Arm)" <robh@kernel.org>
Signed-off-by: Nuno Sá <nuno.sa@analog.com>
Link: https://lore.kernel.org/r/20250701-dev-adp5589-fw-v7-11-b1fcfe9e9826@analog.com
Signed-off-by: Lee Jones <lee@kernel.org>
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Add support for the adp5589 I/O expander. From a PWM point of view it is
pretty similar to adp5585. Main difference is the address
of registers meaningful for configuring the PWM.
Acked-by: Uwe Kleine-König <ukleinek@kernel.org>
Signed-off-by: Nuno Sá <nuno.sa@analog.com>
Link: https://lore.kernel.org/r/20250701-dev-adp5589-fw-v7-10-b1fcfe9e9826@analog.com
Signed-off-by: Lee Jones <lee@kernel.org>
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Support the adp5589 I/O expander which supports up to 19 pins. We need
to add a chip_info based struct since accessing register "banks"
and "bits" differs between devices.
Also some register addresses are different.
While at it move ADP558X_GPIO_MAX defines to the main header file and
rename them. That information will be needed by the top level device in
a following change.
Acked-by: Linus Walleij <linus.walleij@linaro.org>
Acked-by: Bartosz Golaszewski <bartosz.golaszewski@linaro.org>
Signed-off-by: Nuno Sá <nuno.sa@analog.com>
Link: https://lore.kernel.org/r/20250701-dev-adp5589-fw-v7-9-b1fcfe9e9826@analog.com
Signed-off-by: Lee Jones <lee@kernel.org>
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There are some differences in the register map between the devices.
Hence, add a register structure per device. This will be needed in
following patches.
On top of that adp5585_fill_regmap_config() is renamed and reworked so
that the current struct adp5585_info act as template (they indeed
contain all the different data between variants) which can then be
complemented depending on the device (as identified by the id register).
This is done like this since a lot of the data is pretty much the same
between variants of the same device.
Reviewed-by: Lee Jones <lee@kernel.org>
Signed-off-by: Nuno Sá <nuno.sa@analog.com>
Link: https://lore.kernel.org/r/20250701-dev-adp5589-fw-v7-8-b1fcfe9e9826@analog.com
Signed-off-by: Lee Jones <lee@kernel.org>
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The ADP5589 is a 19 I/O port expander with built-in keypad matrix decoder,
programmable logic, reset generator, and PWM generator.
Signed-off-by: Nuno Sá <nuno.sa@analog.com>
Link: https://lore.kernel.org/r/20250701-dev-adp5589-fw-v7-7-b1fcfe9e9826@analog.com
Signed-off-by: Lee Jones <lee@kernel.org>
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The only thing changing between variants is the regmap default
registers. Hence, instead of having a regmap configuration for every
variant (duplicating lots of fields), add a chip info type of structure
with a regmap ID to identify which defaults to use and populate
regmap_config at runtime given a template plus the id. Also note that
between variants, the defaults can be the same which means the chip info
structure can be used in more than one compatible.
This will also make it simpler adding new chips with more variants.
Also note that the chip info structures are deliberately not const as
they will also contain lots of members that are the same between the
different devices variants and so we will fill those at runtime.
Signed-off-by: Nuno Sá <nuno.sa@analog.com>
Link: https://lore.kernel.org/r/20250701-dev-adp5589-fw-v7-6-b1fcfe9e9826@analog.com
Signed-off-by: Lee Jones <lee@kernel.org>
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The ADP5589 is a 19 I/O port expander with built-in keypad matrix decoder,
programmable logic, reset generator, and PWM generator.
We can't really have adp5589 devices fallback to adp5585 (which have
less pins) because there are some significant differences in the register
map.
Reviewed-by: "Rob Herring (Arm)" <robh@kernel.org>
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Signed-off-by: Nuno Sá <nuno.sa@analog.com>
Link: https://lore.kernel.org/r/20250701-dev-adp5589-fw-v7-5-b1fcfe9e9826@analog.com
Signed-off-by: Lee Jones <lee@kernel.org>
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Use the helper macro. No functional change intended...
Whilst we're at it, now seems like a good time to update the Copyright.
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Signed-off-by: Nuno Sá <nuno.sa@analog.com>
Link: https://lore.kernel.org/r/20250701-dev-adp5589-fw-v7-4-b1fcfe9e9826@analog.com
Signed-off-by: Lee Jones <lee@kernel.org>
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Make sure to enable the oscillator in the top device. This will allow to
not control this in the child PWM device as that would not work with
future support for keyboard matrix where the oscillator needs to be
always enabled (and so cannot be disabled by disabling PWM).
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Signed-off-by: Nuno Sá <nuno.sa@analog.com>
Acked-by: Uwe Kleine-König <ukleinek@kernel.org>
Link: https://lore.kernel.org/r/20250701-dev-adp5589-fw-v7-3-b1fcfe9e9826@analog.com
Signed-off-by: Lee Jones <lee@kernel.org>
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Not all devices (features) of the adp5585 device are mandatory to be
used in all platforms. Hence, check what's given in FW and dynamically
create the mfd_cell array to be given to devm_mfd_add_devices().
Signed-off-by: Nuno Sá <nuno.sa@analog.com>
Link: https://lore.kernel.org/r/20250701-dev-adp5589-fw-v7-2-b1fcfe9e9826@analog.com
Signed-off-by: Lee Jones <lee@kernel.org>
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It is not mandatory to use all the capabilities of the device. One can
very well only use it as a gpio controller without the PWM support. This
will be even more evident when support for the matrix keymap is added.
Hence drop the requirements for PWM and GPIO.
Acked-by: "Rob Herring (Arm)" <robh@kernel.org>
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Signed-off-by: Nuno Sá <nuno.sa@analog.com>
Link: https://lore.kernel.org/r/20250701-dev-adp5589-fw-v7-1-b1fcfe9e9826@analog.com
Signed-off-by: Lee Jones <lee@kernel.org>
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It makes no sense for a GPIO descriptor comparator to return true when
the arguments passed to it are NULL or IS_ERR(). Let's validate both and
return false unless both are valid GPIO descriptors.
Suggested-by: Andy Shevchenko <andriy.shevchenko@intel.com>
Link: https://lore.kernel.org/all/Z_aFBfjb17JxOwyk@black.fi.intel.com/
Reviewed-by: Linus Walleij <linus.walleij@linaro.org>
Acked-by: Andy Shevchenko <andriy.shevchenko@intel.com>
Link: https://lore.kernel.org/r/20250620-gpiod-is-equal-improv-v1-2-a75060505d2c@linaro.org
Signed-off-by: Bartosz Golaszewski <bartosz.golaszewski@linaro.org>
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This function is not meant to modify the GPIO descriptors in any way so
we can safely constify both arguments.
Link: https://lore.kernel.org/r/20250620-gpiod-is-equal-improv-v1-1-a75060505d2c@linaro.org
Signed-off-by: Bartosz Golaszewski <bartosz.golaszewski@linaro.org>
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struct gpio_chip now has callbacks for setting line values that return
integers, so they can indicate failures. Convert the driver to using
them.
Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
Reviewed-by: Wolfram Sang <wsa+renesas@sang-engineering.com>
Link: https://lore.kernel.org/r/f09a0481fc0ddafb9aa05d903fbb42ef52332c03.1750838486.git.geert+renesas@glider.be
Signed-off-by: Bartosz Golaszewski <bartosz.golaszewski@linaro.org>
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The GPIO core never passes empty bankmasks to the callbacks for handling
multiple signals at once. Remove the superfluous checks, and refactor
the code.
Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
Reviewed-by: Wolfram Sang <wsa+renesas@sang-engineering.com>
Link: https://lore.kernel.org/r/29fb200d3f92e79cdd5ce4048d2847c265f337b4.1750838486.git.geert+renesas@glider.be
Signed-off-by: Bartosz Golaszewski <bartosz.golaszewski@linaro.org>
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There's no corresponding platform_get_drvdata() used in this module or
the higher-level gpio-mmio. Let's remove the unneeded call to
platform_set_drvdata().
Link: https://lore.kernel.org/r/20250618074653.25555-1-brgl@bgdev.pl
Signed-off-by: Bartosz Golaszewski <bartosz.golaszewski@linaro.org>
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struct gpio_chip now has callbacks for setting line values that return
an integer, allowing to indicate failures. Convert the driver to using
them.
Link: https://lore.kernel.org/r/20250619-gpiochip-set-rv-gpio-v2-12-74abf689fbd8@linaro.org
Signed-off-by: Bartosz Golaszewski <bartosz.golaszewski@linaro.org>
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struct gpio_chip now has callbacks for setting line values that return
an integer, allowing to indicate failures. Convert the driver to using
them.
Link: https://lore.kernel.org/r/20250619-gpiochip-set-rv-gpio-v2-11-74abf689fbd8@linaro.org
Signed-off-by: Bartosz Golaszewski <bartosz.golaszewski@linaro.org>
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struct gpio_chip now has callbacks for setting line values that return
an integer, allowing to indicate failures. Convert the driver to using
them.
Reviewed-by: Heiko Stuebner <heiko@sntech.de>
Link: https://lore.kernel.org/r/20250619-gpiochip-set-rv-gpio-v2-10-74abf689fbd8@linaro.org
Signed-off-by: Bartosz Golaszewski <bartosz.golaszewski@linaro.org>
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struct gpio_chip now has callbacks for setting line values that return
an integer, allowing to indicate failures. Convert the driver to using
them.
Link: https://lore.kernel.org/r/20250619-gpiochip-set-rv-gpio-v2-8-74abf689fbd8@linaro.org
Signed-off-by: Bartosz Golaszewski <bartosz.golaszewski@linaro.org>
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struct gpio_chip now has callbacks for setting line values that return
an integer, allowing to indicate failures. Convert the driver to using
them.
Link: https://lore.kernel.org/r/20250619-gpiochip-set-rv-gpio-v2-7-74abf689fbd8@linaro.org
Signed-off-by: Bartosz Golaszewski <bartosz.golaszewski@linaro.org>
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struct gpio_chip now has callbacks for setting line values that return
an integer, allowing to indicate failures. Convert the driver to using
them.
Link: https://lore.kernel.org/r/20250619-gpiochip-set-rv-gpio-v2-6-74abf689fbd8@linaro.org
Signed-off-by: Bartosz Golaszewski <bartosz.golaszewski@linaro.org>
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The lines on this chip are input-only. GPIO core can handle the missing
.set() callback so there's no need to implement a dummy here. Drop it.
Reviewed-by: Baolin Wang <baolin.wang@linux.alibaba.com>
Link: https://lore.kernel.org/r/20250619-gpiochip-set-rv-gpio-v2-5-74abf689fbd8@linaro.org
Signed-off-by: Bartosz Golaszewski <bartosz.golaszewski@linaro.org>
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struct gpio_chip now has callbacks for setting line values that return
an integer, allowing to indicate failures. Convert the driver to using
them.
Reviewed-by: Linus Walleij <linus.walleij@linaro.org>
Link: https://lore.kernel.org/r/20250619-gpiochip-set-rv-gpio-v2-4-74abf689fbd8@linaro.org
Signed-off-by: Bartosz Golaszewski <bartosz.golaszewski@linaro.org>
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struct gpio_chip now has callbacks for setting line values that return
an integer, allowing to indicate failures. Convert the driver to using
them.
Reviewed-by: Andy Shevchenko <andy@kernel.org>
Link: https://lore.kernel.org/r/20250619-gpiochip-set-rv-gpio-v2-3-74abf689fbd8@linaro.org
Signed-off-by: Bartosz Golaszewski <bartosz.golaszewski@linaro.org>
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struct gpio_chip now has callbacks for setting line values that return
an integer, allowing to indicate failures. Convert the driver to using
them.
Link: https://lore.kernel.org/r/20250619-gpiochip-set-rv-gpio-v2-2-74abf689fbd8@linaro.org
Signed-off-by: Bartosz Golaszewski <bartosz.golaszewski@linaro.org>
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struct gpio_chip now has callbacks for setting line values that return
an integer, allowing to indicate failures. Convert the driver to using
them.
Link: https://lore.kernel.org/r/20250619-gpiochip-set-rv-gpio-v2-1-74abf689fbd8@linaro.org
Signed-off-by: Bartosz Golaszewski <bartosz.golaszewski@linaro.org>
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struct gpio_chip now has callbacks for setting line values that return
an integer, allowing to indicate failures. Convert the driver to using
them.
Signed-off-by: Daniel Sullivan <danieljsullivan7@gmail.com>
Link: https://lore.kernel.org/r/aFdKce3Go9iF4A6m@danv-Standard-PC-Q35-ICH9-2009
Signed-off-by: Bartosz Golaszewski <bartosz.golaszewski@linaro.org>
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When invoking device_create_with_groups(), its return value is stored
in `data->cdev_base`. However, in case of faiure, `data` is first freed
and then derefernced in order to return `data->cdev_base`.
Fix the use-after-free by extracting the error code before free'ing
`data`.
Fixes: fd19792851db ("gpio: sysfs: remove the mockdev pointer from struct gpio_device")
Addresses-Coverity-ID: 1644512 ("Memory - illegal accesses (USE_AFTER_FREE)")
Signed-off-by: Antonio Quartulli <antonio@mandelbit.com>
Link: https://lore.kernel.org/r/20250622220221.28025-1-antonio@mandelbit.com
[Bartosz: added Fixes: tag, tweaked commit message]
Signed-off-by: Bartosz Golaszewski <bartosz.golaszewski@linaro.org>
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The usage of the mockdev pointer in struct gpio_device is limited to the
GPIO sysfs code. There's no reason to keep it in this top-level
structure. Create a separate structure containing the reference to the
GPIO device and the dummy class device that will be passed to
device_create_with_groups(). The !gdev->mockdev checks can be removed as
long as we make sure that all operations on the GPIO class are protected
with the sysfs lock.
Reviewed-by: Linus Walleij <linus.walleij@linaro.org>
Link: https://lore.kernel.org/r/20250610-gpio-sysfs-chip-export-v1-6-a8c7aa4478b1@linaro.org
Signed-off-by: Bartosz Golaszewski <bartosz.golaszewski@linaro.org>
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No symbols from the linux/idr.h or linux/spinlock.h headers are used in
this file so remove them. We also don't technically need linux/list.h
currently but one of the follow-up commits will start using it so let's
leave it.
Reviewed-by: Linus Walleij <linus.walleij@linaro.org>
Link: https://lore.kernel.org/r/20250610-gpio-sysfs-chip-export-v1-5-a8c7aa4478b1@linaro.org
Signed-off-by: Bartosz Golaszewski <bartosz.golaszewski@linaro.org>
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Update the code to be more consistent with the rest of the codebase.
Mostly correctly align line-breaks, remove unneeded tabs, stray newlines
& spaces and tweak the comment style.
No functional change.
Reviewed-by: Linus Walleij <linus.walleij@linaro.org>
Link: https://lore.kernel.org/r/20250610-gpio-sysfs-chip-export-v1-4-a8c7aa4478b1@linaro.org
Signed-off-by: Bartosz Golaszewski <bartosz.golaszewski@linaro.org>
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While not critical, it's useful to have the corresponding call to
mutex_destroy() whenever we use mutex_init(). Add the call right before
kfreeing the GPIO data.
Reviewed-by: Linus Walleij <linus.walleij@linaro.org>
Link: https://lore.kernel.org/r/20250610-gpio-sysfs-chip-export-v1-3-a8c7aa4478b1@linaro.org
Signed-off-by: Bartosz Golaszewski <bartosz.golaszewski@linaro.org>
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Exported GPIO lines also have the active_low attribute which is not
documented. Add a short mention for it.
Reviewed-by: Linus Walleij <linus.walleij@linaro.org>
Link: https://lore.kernel.org/r/20250610-gpio-sysfs-chip-export-v1-2-a8c7aa4478b1@linaro.org
Signed-off-by: Bartosz Golaszewski <bartosz.golaszewski@linaro.org>
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Since commit 700cdf7ed00f ("gpio: sysfs: make the sysfs export behavior
consistent"), named GPIO lines are no longer exported in sysfs as links
named after the them. Drop the misleading bit from the ABI docs.
Reviewed-by: Linus Walleij <linus.walleij@linaro.org>
Link: https://lore.kernel.org/r/20250610-gpio-sysfs-chip-export-v1-1-a8c7aa4478b1@linaro.org
Signed-off-by: Bartosz Golaszewski <bartosz.golaszewski@linaro.org>
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struct gpio_chip now has callbacks for setting line values that return
an integer, allowing to indicate failures. Convert the driver to using
them.
Signed-off-by: Marek Behún <kabel@kernel.org>
Reviewed-by: Linus Walleij <linus.walleij@linaro.org>
Acked-by: Marek Behún <kabel@kernel.org>
Link: https://lore.kernel.org/r/20250610-gpiochip-set-rv-platform-cznic-v1-1-30afd2444756@linaro.org
Signed-off-by: Bartosz Golaszewski <bartosz.golaszewski@linaro.org>
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We've converted this driver to using the new GPIO line value setters but
missed the instances where the legacy callback is accessed directly using
the function pointer. This will lead to a NULL-pointer dereference as
this pointer is no longer populated. The issue needs fixing locally as
well as in the already converted previously users of gpio-mmio.
Fixes: b908d35d0003 ("gpio: mmio: use new GPIO line value setter callbacks")
Reported-by: Klara Modin <klarasmodin@gmail.com>
Closes: https://lore.kernel.org/all/2rw2sncevdiyirpdovotztlg77apcq2btzytuv5jnm55aqhlne@swtts3hl53tw/
Tested-by: Klara Modin <klarasmodin@gmail.com>
Tested-by: Marek Szyprowski <m.szyprowski@samsung.com>
Tested-by: Mark Brown <broonie@kernel.org>
Link: https://lore.kernel.org/r/20250618-gpio-mmio-fix-setter-v1-2-2578ffb77019@linaro.org
Signed-off-by: Bartosz Golaszewski <bartosz.golaszewski@linaro.org>
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We've converted this driver to using the new GPIO line value setters but
missed the instance where the legacy callback is accessed directly using
the function pointer. This will lead to a NULL-pointer dereference as
this pointer is no longer populated. Fix it.
Fixes: 0e1a8930c941 ("gpio: npcm-sgpio: use new GPIO line value setter callbacks")
Link: https://lore.kernel.org/r/20250618-gpio-mmio-fix-setter-v1-1-2578ffb77019@linaro.org
Signed-off-by: Bartosz Golaszewski <bartosz.golaszewski@linaro.org>
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Immutable tag for the pinctrl tree to pull from
Add the BGPIOF_NO_INPUT to the gpio-mmio API.
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When using bgpio_init with a gpiochip acting as a GPO (output only), the
gpiochip ops `direction_input` was set to `bgpio_simple_dir_in` by
default but we have no input ability.
Adding this flag allows to set a valid ops for the `direction_output`
ops without setting a valid ops for `direction_input` by default.
Reviewed-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Clément Le Goffic <clement.legoffic@foss.st.com>
Link: https://lore.kernel.org/r/20250613-hdp-upstream-v5-1-6fd6f0dc527c@foss.st.com
Signed-off-by: Bartosz Golaszewski <bartosz.golaszewski@linaro.org>
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Document that the *_autosuspend() variants of the Runtime PM functions
update the last busy timestamp.
Signed-off-by: Sakari Ailus <sakari.ailus@linux.intel.com>
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Link: https://patch.msgid.link/20250616061212.2286741-7-sakari.ailus@linux.intel.com
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
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Set device's last busy timestamp to current time in
pm_request_autosuspend().
Signed-off-by: Sakari Ailus <sakari.ailus@linux.intel.com>
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Link: https://patch.msgid.link/20250616061212.2286741-6-sakari.ailus@linux.intel.com
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
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Set device's last busy timestamp to current time in
pm_runtime_autosuspend().
Signed-off-by: Sakari Ailus <sakari.ailus@linux.intel.com>
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Link: https://patch.msgid.link/20250616061212.2286741-5-sakari.ailus@linux.intel.com
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
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Set device's last busy timestamp to current time in
pm_runtime_put_sync_autosuspend().
Signed-off-by: Sakari Ailus <sakari.ailus@linux.intel.com>
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Link: https://patch.msgid.link/20250616061212.2286741-4-sakari.ailus@linux.intel.com
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
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Set device's last busy timestamp to current time in
pm_runtime_put_autosuspend(). Callers wishing not to do that will need to
use __pm_runtime_put_autosuspend().
Signed-off-by: Sakari Ailus <sakari.ailus@linux.intel.com>
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Link: https://patch.msgid.link/20250616061212.2286741-3-sakari.ailus@linux.intel.com
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
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Document return values for device suspend and idle related API
functions.
Signed-off-by: Sakari Ailus <sakari.ailus@linux.intel.com>
Link: https://patch.msgid.link/20250616061212.2286741-2-sakari.ailus@linux.intel.com
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
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