SPEAr platform provides a provision to control chipselects of ARM PL022
Prime Cell spi controller through its system registers, which otherwise
remains under PL022 control which some protocols do not want.

This commit intends to provide the spi chipselect control in software over
gpiolib interface. spi chip drivers can use the exported gpiolib interface to
define their chipselect through DT or platform data.

Cc: Grant Likely <grant.likely@secretlab.ca>
Signed-off-by: NShiraz Hashim <shiraz.hashim@st.com>
Reviewed-by: NVipin Kumar <vipin.kumar@st.com>
Acked-by: NArnd Bergmann <arnd@arndb.de>
Signed-off-by: NViresh Kumar <viresh.kumar@linaro.org>
Signed-off-by: NLinus Walleij <linus.walleij@linaro.org>

For probing via device tree, we need to support the case without platform_data.
In this case, chip.base is set to -1 for automatic numbering.
Signed-off-by: NRoland Stigge <stigge@antcom.de>
Acked-by: NWolfram Sang <w.sang@pengutronix.de>
Signed-off-by: NLinus Walleij <linus.walleij@linaro.org>

Avoid using the TWL4030_MODULE_PWMA/B as module ID. The LEDEN, PWMA ON/OFF
and PWMB ON/OFF registers are in a continuous range starting from LED base.
This is going to be helpful for further cleanup in the twl stack.

No functional changes.
Signed-off-by: NPeter Ujfalusi <peter.ujfalusi@ti.com>
Signed-off-by: NLinus Walleij <linus.walleij@linaro.org>

Read the output value when gpio is set for the output mode for
gpio_get_value(). Reading input value in direction out does not
give correct value.
Signed-off-by: NLaxman Dewangan <ldewangan@nvidia.com>
Acked-by: NStephen Warren <swarren@nvidia.com>
Signed-off-by: NLinus Walleij <linus.walleij@linaro.org>

Even though the device tree binding code was already written, the
compatible strings were not yet in the driver.
Signed-off-by: NMaxime Ripard <maxime.ripard@free-electrons.com>
Signed-off-by: NLinus Walleij <linus.walleij@linaro.org>

The PCA953x used to register no IRQ domain, which made it impossible to
use it as an interrupt-parent from the device tree.
Signed-off-by: NMaxime Ripard <maxime.ripard@free-electrons.com>
Signed-off-by: NLinus Walleij <linus.walleij@linaro.org>

We call pinctrl_request_gpio() in request callback, thus we need to call
pinctrl_free_gpio() in free callback.

Both mvebu_gpio_request() and mvebu_gpio_free() are not referenced outside of
this file, make them static.
Signed-off-by: NAxel Lin <axel.lin@ingics.com>
Acked-by: NThomas Petazzoni <thomas.petazzoni@free-electrons.com>
Signed-off-by: NLinus Walleij <linus.walleij@linaro.org>

Both tegra_gpio_enable() and tegra_gpio_disable() are static functions, it does
not make sense to export them.
Signed-off-by: NAxel Lin <axel.lin@ingics.com>
Acked-by: NStephen Warren <swarren@nvidia.com>
Signed-off-by: NLinus Walleij <linus.walleij@linaro.org>

Both tegra_gpio_request() and tegra_gpio_free() are not referenced outside of
this file, make them static.
Signed-off-by: NAxel Lin <axel.lin@ingics.com>
Acked-by: NStephen Warren <swarren@nvidia.com>
Signed-off-by: NLinus Walleij <linus.walleij@linaro.org>

Following are changes done to fix the suspend/resume
functionality of tegra gpio driver:
- Protect suspend/resume callbacks with CONFIG_PM_SLEEP
  because CONFIG_PM doesn't actually enable any of the PM callbacks, it
  only allows to enable CONFIG_PM_SLEEP and CONFIG_PM_RUNTIME.
  This means if CONFIG_PM is used to protect system sleep callbacks
  then it may end up unreferenced if only runtime PM is enabled.

- Fix the suspend/resume APIs declaration as per callback prototype.
Signed-off-by: NLaxman Dewangan <ldewangan@nvidia.com>
Acked-by: NStephen Warren <swarren@nvidia.com>
Signed-off-by: NLinus Walleij <linus.walleij@linaro.org>

This will show the gpio chip as a child node
under /sys/bus/pci/devices/xxxx:xx:xx.x/
Signed-off-by: NAlexander Stein <alexander.stein@systec-electronic.com>
Signed-off-by: NLinus Walleij <linus.walleij@linaro.org>

Fix below build errors:

  CC [M]  drivers/gpio/gpio-em.o
drivers/gpio/gpio-em.c: In function 'em_gio_probe':
drivers/gpio/gpio-em.c:306: error: 'err' undeclared (first use in this function)
drivers/gpio/gpio-em.c:306: error: (Each undeclared identifier is reported only once
drivers/gpio/gpio-em.c:306: error: for each function it appears in.)
drivers/gpio/gpio-em.c:308: error: label 'err3' used but not defined
drivers/gpio/gpio-em.c:279: error: label 'err2' used but not defined
drivers/gpio/gpio-em.c:265: error: label 'err1' used but not defined
drivers/gpio/gpio-em.c:250: error: label 'err0' used but not defined
drivers/gpio/gpio-em.c:309: warning: no return statement in function returning non-void
drivers/gpio/gpio-em.c: At top level:
drivers/gpio/gpio-em.c:311: error: expected identifier or '(' before 'if'
drivers/gpio/gpio-em.c:317: error: expected identifier or '(' before 'if'
drivers/gpio/gpio-em.c:323: warning: data definition has no type or storage class
drivers/gpio/gpio-em.c:323: warning: type defaults to 'int' in declaration of 'ret'
drivers/gpio/gpio-em.c:323: error: 'gpio_chip' undeclared here (not in a function)
drivers/gpio/gpio-em.c:323: error: initializer element is not constant
drivers/gpio/gpio-em.c:324: error: expected identifier or '(' before 'if'
drivers/gpio/gpio-em.c:328: error: expected identifier or '(' before 'return'
drivers/gpio/gpio-em.c:330: error: expected '=', ',', ';', 'asm' or '__attribute__' before ':' token
drivers/gpio/gpio-em.c:332: error: expected '=', ',', ';', 'asm' or '__attribute__' before ':' token
drivers/gpio/gpio-em.c:334: error: expected '=', ',', ';', 'asm' or '__attribute__' before ':' token
drivers/gpio/gpio-em.c:336: error: expected '=', ',', ';', 'asm' or '__attribute__' before ':' token
drivers/gpio/gpio-em.c:338: error: expected '=', ',', ';', 'asm' or '__attribute__' before ':' token
drivers/gpio/gpio-em.c:340: error: expected '=', ',', ';', 'asm' or '__attribute__' before ':' token
drivers/gpio/gpio-em.c:342: error: expected '=', ',', ';', 'asm' or '__attribute__' before ':' token
drivers/gpio/gpio-em.c:344: error: expected identifier or '(' before '}' token
drivers/gpio/gpio-em.c: In function 'em_gio_remove':
drivers/gpio/gpio-em.c:361: error: implicit declaration of function 'em_gio_irq_domain_cleanup'
make[2]: *** [drivers/gpio/gpio-em.o] Error 1
make[1]: *** [drivers/gpio] Error 2
make: *** [drivers] Error 2
Signed-off-by: NAxel Lin <axel.lin@ingics.com>
Signed-off-by: NLinus Walleij <linus.walleij@linaro.org>

platform_device_unregister() only calls platform_device_del() and
platform_device_put(), thus use platform_device_unregister() to
simplify the code.

Also the documents in platform.c shows that platform_device_del
and platform_device_put must _only_ be externally called in error
cases.  All other usage is a bug.

dpatch engine is used to auto generate this patch.
(https://github.com/weiyj/dpatch)
Signed-off-by: NWei Yongjun <yongjun_wei@trendmicro.com.cn>
Signed-off-by: NLinus Walleij <linus.walleij@linaro.org>

The special checks for whether we have a base IRQ offset or not
is surplus if we use the simple IRQ domain. The IRQ offset
zero will be interpreted as a linear domain case.

Plus this makes sure we allocate descriptors where need be, or
warn if they are preallocated with SPARSE_IRQ.

Cc: Grant Likely <grant.likely@secretlab.ca>
Cc: Rob Herring <rob.herring@calxeda.com>
Cc: Lee Jones <lee.jones@linaro.org>
Signed-off-by: NLinus Walleij <linus.walleij@linaro.org>

The code in the em driver seems to want to try to do the job of
the linear IRQ domain (allocate descriptors and grab a virtual
range). So why not just use the linear IRQ domain? The code is
now cut down so we don't need isolated functions for this.

Also note that we use irq_create_mapping() to make sure
descriptors are allocated for these IRQs.

Also fixed the FIXME to remove the domain after use.

Cc: Grant Likely <grant.likely@secretlab.ca>
Cc: Magnus Damm <damm@opensource.se>
Signed-off-by: NLinus Walleij <linus.walleij@linaro.org>

The MVEBU driver probably just wants a few IRQs. Using the simple
domain has the upside of allocating IRQ descriptors if need be,
especially in a SPARSE_IRQ environment.

Cc: Rob Herring <rob.herring@calxeda.com>
Cc: Grant Likely <grant.likely@secretlab.ca>
Cc: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
Cc: Sebastian Hesselbarth <sebastian.hesselbarth@gmail.com>
Cc: Andrew Lunn <andrew@lunn.ch>
Signed-off-by: NLinus Walleij <linus.walleij@linaro.org>

The Tegra driver tries to do the work of irq_domain_add_linear()
by reserving a bunch of descriptors somewhere and keeping track
of the base offset, then calling irq_domain_add_legacy(). Let's
stop doing that and simply use the linear IRQ domain.

For this to work: use irq_create_mapping() in the IRQ iterator
so that the descriptors get allocated here.

Cc: Rob Herring <rob.herring@calxeda.com>
Cc: Grant Likely <grant.likely@secretlab.ca>
Tested-by: NStephen Warren <swarren@nvidia.com>
Acked-by: NStephen Warren <swarren@nvidia.com>
Signed-off-by: NLinus Walleij <linus.walleij@linaro.org>

We need to unlock here before returning.
Signed-off-by: NDan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: NLinus Walleij <linus.walleij@linaro.org>

Add .get_direction callback to gpio_chip. This allows gpiolib
to check the current direction of a gpio.
Used to show the correct gpio direction in sysfs and debug entries.

If callback is not set then gpiolib will work as previously;
e.g. guessing everything is input until a direction is set.
Signed-off-by: NMathias Nyman <mathias.nyman@linux.intel.com>
Signed-off-by: NLinus Walleij <linus.walleij@linaro.org>

PORTD have different direction logic, i.e. "0" is output and "1" is input.
This patch fix this issue.
Signed-off-by: NAlexander Shiyan <shc_work@mail.ru>
Signed-off-by: NLinus Walleij <linus.walleij@linaro.org>

Signed-off-by: NAlexander Shiyan <shc_work@mail.ru>
Signed-off-by: NLinus Walleij <linus.walleij@linaro.org>

The gpio_export function uses nested if statements and the status
variable to handle the failure cases. This makes the function logic
difficult to follow. Refactor the code to abort immediately on failure
using goto. This makes the code slightly longer, but significantly
reduces the nesting and number of split lines and makes the code easier
to read.
Signed-off-by: NRyan Mallon <rmallon@gmail.com>
Signed-off-by: NLinus Walleij <linus.walleij@linaro.org>

These SoC's have an extended bank of GPIO's seperate to the main
GPIO block. This patch adds the additional 5 GPIO's located in this
block which control I2C and PWMOUT.
Signed-off-by: NTony Prisk <linux@prisktech.co.nz>
Signed-off-by: NLinus Walleij <linus.walleij@linaro.org>

The CLPS711X CPUs provide some GPIOs for use in the system. This
driver provides support for these via gpiolib. Due to platform
limitations, driver does not support interrupts, only inputs and
outputs.
Signed-off-by: NAlexander Shiyan <shc_work@mail.ru>
Acked-by: NRussell King <rmk+kernel@arm.linux.org.uk>
Signed-off-by: NLinus Walleij <linus.walleij@linaro.org>

This is the GPIO patch for the DA9055 PMIC. This patch has got
dependency on the DA9055 MFD core.

This patch is functionally tested on SMDK6410 board.
Signed-off-by: NDavid Dajun Chen <dchen@diasemi.com>
Signed-off-by: NAshish Jangam <ashish.jangam@kpitcummins.com>
Signed-off-by: NLinus Walleij <linus.walleij@linaro.org>

A pointer to "pdev->dev" is already stored in "dev", so use it in
devm_kzalloc.
Signed-off-by: NTobias Klauser <tklauser@distanz.ch>
Acked-by: NKevin Hilman <khilman@ti.com>
Signed-off-by: NLinus Walleij <linus.walleij@linaro.org>

Use the devm_* family of functions during probe to reduce the error
handling code footprint.
Signed-off-by: NTobias Klauser <tklauser@distanz.ch>
Signed-off-by: NLinus Walleij <linus.walleij@linaro.org>

Patch 6e20a0a4 "gpio: pcf857x: enable gpio_to_irq() support"
added IRQ domain support to the pcf857x driver, but some configurations
(e.g. davinci_all_defconfig) don't already enable CONFIG_IRQ_DOMAIN.

Always selecting it from the Kconfig in this case is what other
such drivers do as well, and avoids these build errors:

Without this patch, building davinci_all_defconfig results in:

drivers/gpio/gpio-pcf857x.c: In function 'pcf857x_to_irq':
drivers/gpio/gpio-pcf857x.c:167:2: error: implicit declaration of function 'irq_create_mapping'
drivers/gpio/gpio-pcf857x.c: In function 'pcf857x_irq_demux_work':
drivers/gpio/gpio-pcf857x.c:183:3: error: implicit declaration of function 'irq_find_mapping'
drivers/gpio/gpio-pcf857x.c: In function 'pcf857x_irq_domain_cleanup':
drivers/gpio/gpio-pcf857x.c:218:3: error: implicit declaration of function 'irq_domain_remove'
drivers/gpio/gpio-pcf857x.c: In function 'pcf857x_irq_domain_init':
drivers/gpio/gpio-pcf857x.c:230:2: error: implicit declaration of function 'irq_domain_add_linear'
Signed-off-by: NArnd Bergmann <arnd@arndb.de>
Cc: Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>
Cc: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: NLinus Walleij <linus.walleij@linaro.org>

This patch adds the missing gpi28 to the list of GPIOs in the GPI P3 "chip".

NOTE: This patch depends on incrementing LPC32XX_GPI_P3_MAX.  When applied
without the respective mach-lpc32xx patch (merged via arm-soc.git), gcc will
give a warning about "excess elements in array initializer" but this doesn't
harm.
Signed-off-by: NRoland Stigge <stigge@antcom.de>
Signed-off-by: NLinus Walleij <linus.walleij@linaro.org>

For GPIOs of gpio-lpc32xx, gpio_direction_output() ignores the value argument
(initial value of output). This patch fixes this by setting the level
accordingly.

Cc: stable@kernel.org
Signed-off-by: NRoland Stigge <stigge@antcom.de>
Acked-by: NAlexandre Pereira da Silva <aletes.xgr@gmail.com>
Signed-off-by: NLinus Walleij <linus.walleij@linaro.org>

This driver aims at replacing the arch/arm/plat-orion/gpio.c driver,
and is designed to be compatible with all Marvell EBU SoCs: Orion,
Kirkwood, Dove, Armada 370/XP and Discovery.

It has been successfully tested on Dove and Armada XP at the moment.

Compared to the plat-orion driver, this new driver has the following
added benefits:

 *) Support for Armada 370 and Armada XP
 *) It is integrated with the mvebu pinctrl driver so that GPIO pins
    are properly muxed, and the GPIO driver knows which GPIO pins are
    output-only or input-only.
 *) Properly placed in drivers/gpio
 *) More extensible mechanism to support platform differences. The
    plat-orion driver uses a simple mask-offset DT property, which
    works fine for Discovery MV78200 but not for Armada XP. The new
    driver uses different compatible strings to identify the different
    variants of the GPIO controllers.
Signed-off-by: NThomas Petazzoni <thomas.petazzoni@free-electrons.com>
Cc: Grant Likely <grant.likely@secretlab.ca>
Cc: Linus Walleij <linus.walleij@stericsson.com>
Cc: Andrew Lunn <andrew@lunn.ch>
Cc: Jason Cooper <jason@lakedaemon.net>
Cc: Gregory Clement <gregory.clement@free-electrons.com>
Tested-by: NSebastian Hesselbarth <sebastian.hesselbarth@gmail.com>
Reviewed-by: NLinus Walleij <linus.walleij@linaro.org>
Tested-by: NAndrew Lunn <andrew@lunn.ch>
Acked-by: NArnd Bergmann <arnd@arndb.de>
Signed-off-by: NJason Cooper <jason@lakedaemon.net>

Converted the existing arch-vt8500 gpio to a platform_device.
Added support for WM8505 and WM8650 GPIO controllers.
Replaced existing readl/writel calls with _relaxed variants.
Replaced existing unsigned variables with u32 to match register size.
Signed-off-by: NTony Prisk <linux@prisktech.co.nz>
Reviewed-by: NLinus Walleij <linus.walleij@linaro.org>

TWL6040 provides GPO lines to be used for controlling external devices.The number
of lines different between versions: twl6040 have 3 GPO while TWL6041 have 1.
Signed-off-by: NSergio Aguirre <saaguirre@ti.com>
Signed-off-by: NPeter Ujfalusi <peter.ujfalusi@ti.com>
Acked-by: NLinus Walleij <linus.walleij@linaro.org>
Signed-off-by: NSamuel Ortiz <sameo@linux.intel.com>

This commit adds a driver for the Avionic Design N-bit GPIO expander.
The expander provides a variable number of GPIO pins with interrupt
support.

Changes in v2:
- allow building the driver as a module
- assign of_node unconditionally
- use linear mapping IRQ domain
- properly cleanup IRQ domain
- add OF device table and annotate device tables
- emulate rising and falling edge triggers
- increase #gpio-cells to 2
- drop support for !OF
- use IS_ENABLED to conditionalize DEBUG_FS code

Changes in v3:
- make IRQ support runtime configurable (interrupt-controller property)
- drop interrupt-controller and #interrupt-cells from DT binding
- add inline to_adnp() function to wrap container_of() macro
- consistently use adnp as name for struct adnp variables
- remove irq_mask_cur and rename irq_mask to irq_enable
- fix a subtle deadlock in adnp_gpio_direction_output()
- remove dynamic allocations from debugfs code
- rename regs to num_regs to avoid confusion
- annotate non-trivial code with comments
- don't acquire mutex in adnp_gpio_get()
- assume NO_IRQ == 0

Cc: Grant Likely <grant.likely@secretlab.ca>
Cc: devicetree-discuss@lists.ozlabs.org
Cc: Linus Walleij <linus.walleij@stericsson.com>
Cc: linux-kernel@vger.kernel.org
Acked-by: NRob Herring <rob.herring@calxeda.com>
Signed-off-by: NThierry Reding <thierry.reding@avionic-design.de>
Signed-off-by: NLinus Walleij <linus.walleij@linaro.org>

Using for_each_set_bit() to simplify the code.

spatch with a semantic match is used to found this.
(http://coccinelle.lip6.fr/)
Signed-off-by: NWei Yongjun <yongjun_wei@trendmicro.com.cn>
Acked-by: NHaojian Zhuang <haojian.zhuang@gmail.com>
Acked-by: NEric Miao <eric.y.miao@gmail.com>
Signed-off-by: NLinus Walleij <linus.walleij@linaro.org>

Using for_each_set_bit() to simplify the code.

spatch with a semantic match is used to found this.
(http://coccinelle.lip6.fr/)
Signed-off-by: NWei Yongjun <yongjun_wei@trendmicro.com.cn>
Acked-by: NDavid Brown <davidb@codeaurora.org>
Signed-off-by: NLinus Walleij <linus.walleij@linaro.org>

The ICH chips have their GPIO pins organized in 2 or 3 independent
groups of 32 GPIO pins. It can happen that the ACPI BIOS wants to make
use of pins in one group, preventing the OS to access these. This does
not prevent the OS from accessing the other group(s).

This is the case for example on my Asus Z8NA-D6 board. The ACPI BIOS
wants to control GPIO 18 (group 1), while I (the OS) need to control
GPIO 52 and 53 (group 2) for SMBus multiplexing.

So instead of checking for ACPI resource conflict on the whole I/O
range, check on a per-group basis, and consider it a success if at
least one of the groups is available for the OS to use.
Signed-off-by: NJean Delvare <khali@linux-fr.org>
Cc: Peter Tyser <ptyser@xes-inc.com>
Cc: Aaron Sierra <asierra@xes-inc.com>
Cc: Grant Likely <grant.likely@secretlab.ca>
Acked-by: NLinus Walleij <linus.walleij@linaro.org>
Signed-off-by: NSamuel Ortiz <sameo@linux.intel.com>

The driver was using a 16 bit field for storing the shadow value of the shift
register cascade. This resulted in only the first 2 shift registeres receiving
the correct data. The third shift register would always receive 0x00.

Fix this by using a 32bit field for the shadow value.
Signed-off-by: NJohn Crispin <blogic@openwrt.org>
Cc: linux-kernel@vger.kernel.org

This way we can remove includes of plat/gpio.h which won't work
with the single zImage support.

Note that we also remove the cpu_class_is_omap2() check
in gpio-omap.c as the drivers should not call it as we need to
make it local to arch/arm/mach-omap2 for single zImage support.

While at it, arrange the related includes in the standard way.

Cc: Grant Likely <grant.likely@secretlab.ca>
Cc: linux-mtd@lists.infradead.org
Cc: alsa-devel@alsa-project.org
Acked-by: NLinus Walleij <linus.walleij@linaro.org>
Signed-off-by: NTony Lindgren <tony@atomide.com>

We can't use hardcoded interrupts for SPARSE_IRQ, and can replace
the hardcoded gpio_base with twl_gpiochip.base after it's been
allocated.

Cc: Grant Likely <grant.likely@secretlab.ca>
Cc: Samuel Ortiz <sameo@linux.intel.com>
Cc: Peter Ujfalusi <peter.ujfalusi@ti.com>
Acked-by: NLinus Walleij <linus.walleij@linaro.org>
Signed-off-by: NTony Lindgren <tony@atomide.com>