This GPIO driver is for HiSilicon's ARM SoC.

HiSilicon's GPIO controller support double-edge interrupt and multi-core
concurrent access.

ACPI table example for this GPIO controller:
Device (GPO0)
{
	Name (_HID, "HISI0184")
	Device (PRTA)
	{
		Name (_ADR, Zero)
		Name (_UID, Zero)
		Name (_DSD, Package (0x01)
		{
			Package (0x02)
			{
				"ngpios",
				0x20
			}
		})
	}
}
Signed-off-by: Luo Jiaxing <luojiaxing@huawei.com>
Link: https://lore.kernel.org/r/1607934255-52544-2-git-send-email-luojiaxing@huawei.comSigned-off-by: Linus Walleij <linus.walleij@linaro.org>

Simplify the return expression.
Signed-off-by: Zheng Yongjun <zhengyongjun3@huawei.com>
Link: https://lore.kernel.org/r/20201210135609.1372-1-zhengyongjun3@huawei.comSigned-off-by: Linus Walleij <linus.walleij@linaro.org>

irqchip shared with multiple gpiochips, leads to recursive call of
gpiochip_irq_mask/gpiochip_irq_unmask which was assigned to
rqchip->irq_mask/irqchip->irq_unmask, these happens becouse of
only irqchip->irq_enable == gpiochip_irq_enable is checked.

Let's add an additional check to make sure shared irqchip is detected
even if irqchip->irq_enable wasn't defined.

Fixes: a8173820 ("gpio: gpiolib: Allow GPIO IRQs to lazy disable")
Signed-off-by: Nikita Shubin <nikita.shubin@maquefel.me>
Link: https://lore.kernel.org/r/20201210070514.13238-1-nikita.shubin@maquefel.meSigned-off-by: Linus Walleij <linus.walleij@linaro.org>

Convert the mt7621-gpio device tree bindings to the new YAML format.
Signed-off-by: Sergio Paracuellos <sergio.paracuellos@gmail.com>
Reviewed-by: Rob Herring <robh@kernel.org>
Link: https://lore.kernel.org/r/20201207081151.7489-1-sergio.paracuellos@gmail.comSigned-off-by: Linus Walleij <linus.walleij@linaro.org>

Merge tag 'gpio-updates-for-v5.11' of git://git.kernel.org/pub/scm/linux/kernel/git/brgl/linux into devel

gpio updates for v5.11-rc1

- several refactoring patches of the core gpiolib code
- add support for NXP PCAL9554B/C to gpio-pca953x
- allow probing mockup devices from device tree
- refactoring and improvements to gpio-rcar
- improvements to locking in gpio-tegra
- code shrink in gpiolib devres
- get the irq offset from device tree in gpio-sifive
- major refactoring of gpio-exar
- convert gpio-mvebu pwm access to regmap
- create a new submenu for virtual GPIO drivers
- fix clang fall-through warnings treewide
- minor driver refactoring and tweaks sprinkled all over

When reporting the state of a GPIO to userspace, we never check
for the actual validity of the line, meaning we report invalid
lines as being usable. A subsequent request will fail though,
which is an inconsistent behaviour from a userspace perspective.

Instead, let's check for the validity of the line and report it
as used if it is invalid. This allows a tool such as gpioinfo
to report something sensible:

gpiochip3 - 4 lines:
	line   0:      unnamed       unused   input  active-high
	line   1:      unnamed       kernel   input  active-high [used]
	line   2:      unnamed       kernel   input  active-high [used]
	line   3:      unnamed       unused   input  active-high

In this example, lines 1 and 2 are invalid, and cannot be used by
userspace.
Signed-off-by: Marc Zyngier <maz@kernel.org>
Reviewed-by: Andy Shevchenko <andy.shevchenko@gmail.com>
Link: https://lore.kernel.org/r/20201204164739.781812-2-maz@kernel.orgSigned-off-by: Linus Walleij <linus.walleij@linaro.org>

Since we already have a few virtual GPIO drivers, and more to come,
this category deserves its own submenu.
Signed-off-by: Enrico Weigelt, metux IT consult <info@metux.net>
Signed-off-by: Bartosz Golaszewski <bgolaszewski@baylibre.com>

Prefer SPDX-License-Identifier over hand-written texts.
Signed-off-by: Enrico Weigelt, metux IT consult <info@metux.net>
Link: https://lore.kernel.org/r/20201203182423.5499-3-info@metux.netSigned-off-by: Linus Walleij <linus.walleij@linaro.org>

For logging in device contexts, dev_*() functions are preferred over
raw printk(), which also print out device name.
Signed-off-by: Enrico Weigelt, metux IT consult <info@metux.net>
Link: https://lore.kernel.org/r/20201203182423.5499-2-info@metux.netSigned-off-by: Linus Walleij <linus.walleij@linaro.org>

For logging in device contexts, dev_*() functions are preferred over
raw printk(), which also print out device name.
Signed-off-by: Enrico Weigelt, metux IT consult <info@metux.net>
Link: https://lore.kernel.org/r/20201203182423.5499-1-info@metux.netSigned-off-by: Linus Walleij <linus.walleij@linaro.org>

The idea to create a debugfs to replace the aging and
dangerous sysfs ABI for hacking and tinkering came up
on the list.
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
Reviewed-by: Geert Uytterhoeven <geert+renesas@glider.be>
Cc: Geert Uytterhoeven <geert+renesas@glider.be>
Link: https://lore.kernel.org/r/20201204083533.65830-1-linus.walleij@linaro.org

When trying to export an nonexisting gpio ID, the kernel prints out a
big warning w/ stacktrace, sounding like a huge problem. In fact it's
a pretty normal situation, like file or device not found.

So, just print a more relaxed warning instead.

changes v2: drop defining pr_fmt()
Signed-off-by: Enrico Weigelt <info@metux.net>
Link: https://lore.kernel.org/r/20201202133754.32045-1-info@metux.netSigned-off-by: Linus Walleij <linus.walleij@linaro.org>

Add support for selecting the realtime clock for events.
Signed-off-by: Kent Gibson <warthog618@gmail.com>
Link: https://lore.kernel.org/r/20201014231158.34117-4-warthog618@gmail.comSigned-off-by: Linus Walleij <linus.walleij@linaro.org>

Add support for reporting if a line is configured to report realtime
timestamps in events.
Signed-off-by: Kent Gibson <warthog618@gmail.com>
Link: https://lore.kernel.org/r/20201014231158.34117-3-warthog618@gmail.comSigned-off-by: Linus Walleij <linus.walleij@linaro.org>

Using CLOCK_REALTIME as the source for event timestamps is crucial for
some specific applications, particularly those requiring timetamps
relative to a PTP clock, so provide an option to switch the event
timestamp source from the default CLOCK_MONOTONIC to CLOCK_REALTIME.

Note that CLOCK_REALTIME was the default source clock for GPIO until
Linux 5.7 when it was changed to CLOCK_MONOTONIC due to issues with the
shifting of the realtime clock.
Providing this option maintains the CLOCK_MONOTONIC as the default,
while also providing a path forward for those dependent on the pre-5.7
behaviour.
Suggested-by: Jack Winch <sunt.un.morcov@gmail.com>
Signed-off-by: Kent Gibson <warthog618@gmail.com>
Link: https://lore.kernel.org/r/20201014231158.34117-2-warthog618@gmail.comSigned-off-by: Linus Walleij <linus.walleij@linaro.org>

This adds a driver that supports the GPIO block found in
MStar/SigmaStar ARMv7 SoCs.

The controller seems to have enough register for 128 lines
but where they are wired up differs between chips and
no currently known chip uses anywhere near 128 lines so there
needs to be some per-chip data to collect together what lines
actually have physical pins attached and map the right names to them.

The core peripherals seem to use the same lines on the
currently known chips but the lines used for the sensor
interface, lcd controller etc pins seem to be totally
different between the infinity and mercury chips

The code tries to collect all of the re-usable names,
offsets etc together so that it's easy to build the extra
per-chip data for other chips in the future.

So far this only supports the MSC313 and MSC313E chips.

Support for the SSC8336N (mercury5) is trivial to add once
all of the lines have been mapped out.
Signed-off-by: Daniel Palmer <daniel@0x0f.com>
Link: https://lore.kernel.org/r/20201129110803.2461700-4-daniel@0x0f.comSigned-off-by: Linus Walleij <linus.walleij@linaro.org>

Add a binding description for the MStar/SigmaStar GPIO controller
found in the MSC313 and later ARMv7 SoCs.
Signed-off-by: Daniel Palmer <daniel@0x0f.com>
Reviewed-by: Rob Herring <robh@kernel.org>
Link: https://lore.kernel.org/r/20201129110803.2461700-3-daniel@0x0f.comSigned-off-by: Linus Walleij <linus.walleij@linaro.org>

Header adds defines for the gpio number of each pad from the driver view.

The gpio block seems to have enough registers for 128 lines but what line
is mapped to a physical pin depends on the chip. The gpio block also seems
to contain some registers that are not related to gpio but needed somewhere
to go.

Because of the above the driver itself uses the index of a pin's offset in
an array of the possible offsets for a chip as the gpio number.
Signed-off-by: Daniel Palmer <daniel@0x0f.com>
Reviewed-by: Rob Herring <robh@kernel.org>
Link: https://lore.kernel.org/r/20201129110803.2461700-2-daniel@0x0f.comSigned-off-by: Linus Walleij <linus.walleij@linaro.org>

Use a unique include guard for the Tegra186 GPIO DT bindings header to
avoid clashes with the DT bindings header for earlier chips.
Signed-off-by: Thierry Reding <treding@nvidia.com>
Link: https://lore.kernel.org/r/20201127140852.123192-2-thierry.reding@gmail.comSigned-off-by: Linus Walleij <linus.walleij@linaro.org>

The "Interacting With the Legacy GPIO Subsystem" of the documentation
was unclear at best, and even included a sentence that seems to say the
opposite of what it should say about the lifetime of the return value of
the conversion functions.

Try to clarify things a bit and hopefully make that section more
readable.
Reported-by: Andy Shevchenko <andy.shevchenko@gmail.com>
BugLink: https://stackoverflow.com/q/64455505/2511795Signed-off-by: Alexandre Courbot <gnurou@gmail.com>
Link: https://lore.kernel.org/r/20201122092548.61979-1-gnurou@gmail.comSigned-off-by: Linus Walleij <linus.walleij@linaro.org>

mxs is a devicetree-only platform and hence it does not make use
of the id_table mechanism.

Get rid of the .id_table as it is unused.
Signed-off-by: Fabio Estevam <festevam@gmail.com>
Link: https://lore.kernel.org/r/20201118191938.32693-1-festevam@gmail.comSigned-off-by: Linus Walleij <linus.walleij@linaro.org>

This assigns the .irq_set_affinity to the parent callback.
I assume the Tegra186 is an SMP system so this would be
beneficial.

I used the pattern making the hirerarchy tolerant for missing
parent as in Marc's earlier patch.
Suggested-by: Marc Zyngier <maz@kernel.org>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
Cc: Thierry Reding <treding@nvidia.com>
Cc: Vidya Sagar <vidyas@nvidia.com>
Link: https://lore.kernel.org/r/20201117213351.249668-2-linus.walleij@linaro.org

This assigns the .irq_set_affinity to the parent callback.
I assume the sifive GPIO can be used in systems with
SMP.

I used the pattern making the hirerarchy tolerant for missing
parent as in Marc's earlier patches.
Suggested-by: Marc Zyngier <maz@kernel.org>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
Cc: Yash Shah <yash.shah@sifive.com>
Cc: Wesley W. Terpstra <wesley@sifive.com>
Link: https://lore.kernel.org/r/20201117213351.249668-1-linus.walleij@linaro.org

If users select sysfs support they get the character device
as well so that end-users cannot complain that they
"only have sysfs on my system". They should have the
character device at all times.

If someone is in so dire need of stripping out the
character device while still enabling the sysfs ABI they
can very well patch the kernel.

Also only show this obsolete option to expert users.
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
Link: https://lore.kernel.org/r/20201110142724.14760-1-linus.walleij@linaro.org

Commit 2233bf7a ("gpio: mvebu: switch to regmap for register access")
changed most readl/writel registers access calls to the regmap API in
preparation for Armada 7K/8K support. PWM duration registers were left using
readl/writel, as the driver does not support PWM for Armada 7K/8K.

Switch PWM duration registers to regmap as first step in adding Armada 7K/8K
PWM functionality support.
Reviewed-by: Andrew Lunn <andrew@lunn.ch>
Signed-off-by: Baruch Siach <baruch@tkos.co.il>
Signed-off-by: Bartosz Golaszewski <bgolaszewski@baylibre.com>

Commit 2233bf7a ("gpio: mvebu: switch to regmap for register access")
introduced percpu_regs to replace percpu_membase. Update the comment to
match.

Cc: Thomas Petazzoni <thomas.petazzoni@bootlin.com>
Fixes: 2233bf7a ("gpio: mvebu: switch to regmap for register access")
Reviewed-by: Andrew Lunn <andrew@lunn.ch>
Signed-off-by: Baruch Siach <baruch@tkos.co.il>
Signed-off-by: Bartosz Golaszewski <bgolaszewski@baylibre.com>

The gpiochip may have dependencies from pinmux and so got deferred. Now it
will print error message every time -EPROBE_DEFER is returned which is
unnecessary:

"gpiochip_add_data_with_key: GPIOs 0..31 (gpio-0-31) failed to register, -517"

Hence, do suppress error message for -EPROBE_DEFER case.
Signed-off-by: Grygorii Strashko <grygorii.strashko@ti.com>
Signed-off-by: Bartosz Golaszewski <bgolaszewski@baylibre.com>

In preparation to enable -Wimplicit-fallthrough for Clang, fix a
warning by explicitly adding a fallthrough pseudo-keyword to indicate
that the code is intended to fall through to the next case.

Link: https://github.com/KSPP/linux/issues/115Signed-off-by: Gustavo A. R. Silva <gustavoars@kernel.org>
Signed-off-by: Bartosz Golaszewski <bgolaszewski@baylibre.com>

In preparation to enable -Wimplicit-fallthrough for Clang, fix a warning
by explicitly adding a break statement instead of letting the code fall
through to the next case.

Link: https://github.com/KSPP/linux/issues/115Signed-off-by: Gustavo A. R. Silva <gustavoars@kernel.org>
Reviewed-by: Andy Shevchenko <andy.shevchenko@gmail.com>
Signed-off-by: Bartosz Golaszewski <bgolaszewski@baylibre.com>

The gpiochip_add_data() may return -EPROBE_DEFER which is not handled
properly by TI GPIO driver and causes unnecessary boot log messages.

Hence, add proper deferred probe handling with new dev_err_probe() API.
Signed-off-by: Grygorii Strashko <grygorii.strashko@ti.com>
Acked-by: Tony Lindgren <tony@atomide.com>
Signed-off-by: Bartosz Golaszewski <bgolaszewski@baylibre.com>

There is no matching spi_get_drvdata() call in the driver, so there is no
need to do spi_set_drvdata(). This looks like it probably was copied from a
driver that used both spi_set_drvdata() & spi_get_drvdata().
Signed-off-by: Alexandru Ardelean <alexandru.ardelean@analog.com>
Reviewed-by: Andy Shevchenko <andy.shevchenko@gmail.com>
Signed-off-by: Bartosz Golaszewski <bgolaszewski@baylibre.com>

In dwapb_get_reset(), if devm_reset_control_get_optional_shared() fails,
an error message is printed even if the failure is the benign
EPROBE_DEFER error due to the reset controller not yet being
initialized. Use dev_err_probe() to handle
devm_reset_control_get_optional_shared() errors to avoid unnecessarilly
printing an error message for the deferred probe error.
Signed-off-by: Damien Le Moal <damien.lemoal@wdc.com>
Signed-off-by: Bartosz Golaszewski <bgolaszewski@baylibre.com>

We can simplify the error path in probe() and drop remove() entirely if
we provide a devm action for freeing the device ID.
Signed-off-by: Bartosz Golaszewski <bgolaszewski@baylibre.com>
Reviewed-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>

We can simplify the code in gpio-exar by using regmap. This allows us to
drop the mutex (regmap provides its own locking) and we can also reuse
regmap's bit operations instead of implementing our own update function.
Signed-off-by: Bartosz Golaszewski <bgolaszewski@baylibre.com>
Reviewed-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>

Provide and use helpers for calculating the register address and bit
offset instead of hand coding it in every function.
Signed-off-by: Bartosz Golaszewski <bgolaszewski@baylibre.com>
Reviewed-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>

It's more elegant to use a helper local variable to store the address
of the underlying struct device than to dereference pdev everywhere. It
also has the benefit of avoiding unnecessary line breaks.
Signed-off-by: Bartosz Golaszewski <bgolaszewski@baylibre.com>
Reviewed-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>

We don't need to specify any ranges when allocating IDs so we can switch
to ida_alloc() and ida_free() instead of the ida_simple_ counterparts.

ida_simple_get(ida, 0, 0, gfp) is equivalent to
ida_alloc_range(ida, 0, UINT_MAX, gfp) which is equivalent to
ida_alloc(ida, gfp). Note: IDR will never actually allocate an ID
larger than INT_MAX.
Signed-off-by: Bartosz Golaszewski <bgolaszewski@baylibre.com>
Reviewed-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>

This driver uses IDA APIs but doesn't include the relevant header. This
fixes it.
Signed-off-by: Bartosz Golaszewski <bgolaszewski@baylibre.com>
Reviewed-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>

It's customary to have a newline between the copyright header and the
includes. Add one to gpio-exar.
Signed-off-by: Bartosz Golaszewski <bgolaszewski@baylibre.com>
Reviewed-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>

We can get hwirq number of the gpio by its irq_data->hwirq so that we don't
need to add more macros for different platforms. This patch is tested in
SiFive Unleashed board and SiFive Unmatched board.
Signed-off-by: Greentime Hu <greentime.hu@sifive.com>
Signed-off-by: Bartosz Golaszewski <bgolaszewski@baylibre.com>