This is a GPIO driver, include only <linux/gpio/driver.h>.
Signed-off-by: NLinus Walleij <linus.walleij@linaro.org>

This is a GPIO driver, include only <linux/gpio/driver.h>.
Signed-off-by: NLinus Walleij <linus.walleij@linaro.org>

This is a GPIO driver, include only <linux/gpio/driver.h>.
Signed-off-by: NLinus Walleij <linus.walleij@linaro.org>

This is a GPIO driver, include only <linux/gpio/driver.h>.
Signed-off-by: NLinus Walleij <linus.walleij@linaro.org>

Adopt the SPDX license identifier headers to ease license compliance
management.
Signed-off-by: NFabio Estevam <fabio.estevam@nxp.com>
Signed-off-by: NLinus Walleij <linus.walleij@linaro.org>

The new challenge is to remove VLAs from the kernel
(see https://lkml.org/lkml/2018/3/7/621)

The number of GPIOs on the supported chips is fairly small
so stack allocate to a known upper bound and spit out a warning
if any new chips have more gpios.
Signed-off-by: NLaura Abbott <labbott@redhat.com>
Reviewed-by: NPhil Reid <preid@electromag.com.au>
Reviewed-by: NKees Cook <keescook@chromium.org>
Signed-off-by: NLinus Walleij <linus.walleij@linaro.org>

Adopt the SPDX license identifier headers to ease license compliance
management.
Signed-off-by: NFabio Estevam <fabio.estevam@nxp.com>
Signed-off-by: NLinus Walleij <linus.walleij@linaro.org>

Some i.MX SoCs have GPIO clock gates in CCM CCGR, such as
i.MX6SLL, need to enable clocks before accessing GPIO
registers, add optional clock operation for GPIO driver.
Signed-off-by: NAnson Huang <Anson.Huang@nxp.com>
Reviewed-by: NFabio Estevam <fabio.estevam@nxp.com>
Signed-off-by: NLinus Walleij <linus.walleij@linaro.org>

The new challenge is to remove VLAs from the kernel
(see https://lkml.org/lkml/2018/3/7/621) to eventually
turn on -Wvla.

Using a kmalloc array is the easy way to fix this but kmalloc is still
more expensive than stack allocation. Introduce a fast path with a
fixed size stack array to cover most chip with gpios below some fixed
amount. The slow path dynamically allocates an array to cover those
chips with a large number of gpios.
Reviewed-by: NGeert Uytterhoeven <geert+renesas@glider.be>
Reviewed-by: NPhil Reid <preid@electromag.com.au>
Reviewed-and-tested-by: NLukas Wunner <lukas@wunner.de>
Signed-off-by: NLukas Wunner <lukas@wunner.de>
Signed-off-by: NLaura Abbott <labbott@redhat.com>
Reviewed-by: NAndy Shevchenko <andy.shevchenko@gmail.com>
Signed-off-by: NLinus Walleij <linus.walleij@linaro.org>

The current driver does a read/modify/write of the output
registers when changing a bit in __aspeed_gpio_set().

This is sub-optimal for a couple of reasons:

  - If any of the neighbouring GPIOs (sharing the shared
register) isn't (yet) configured as an output, it will
read the current input value, and then apply it to the
output latch, which may not be what the user expects. There
should be no bug in practice as aspeed_gpio_dir_out() will
establish a new value but it's not great either.

  - The GPIO block in the aspeed chip is clocked rather
slowly (typically 25Mhz). That extra MMIO read halves the maximum
speed at which we can toggle the GPIO.

This provides a significant performance improvement to the GPIO
based FSI master.
Signed-off-by: NBenjamin Herrenschmidt <benh@kernel.crashing.org>
Reviewed-by: NChristopher Bostic <cbostic@linux.vnet.ibm.com>
Reviewed-by: NAndrew Jeffery <andrew@aj.id.au>
Tested-by: NJoel Stanley <joel@jms.id.au>
Signed-off-by: NLinus Walleij <linus.walleij@linaro.org>

In aspeed_gpio_dir_out(), we need to establish the new output
value in the output latch *before* we change the direction
to output in order to avoid a glitch on the output line if
the previous value of the latch was different.
Signed-off-by: NBenjamin Herrenschmidt <benh@kernel.crashing.org>
Reviewed-by: NChristopher Bostic <cbostic@linux.vnet.ibm.com>
Reviewed-by: NAndrew Jeffery <andrew@aj.id.au>
Tested-by: NJoel Stanley <joel@jms.id.au>
Signed-off-by: NLinus Walleij <linus.walleij@linaro.org>

The register constants are so far defined in a way that they fit
for the pcal9555a when shifted by the number of banks, i.e. are
multiplied by 2 in the accessor function.

Now, the pcal6524 has 3 banks which means the relative offset
is multiplied by 4 for the standard registers.

Simply applying the bit shift to the extended registers gives
a wrong result, since the base offset is already included in
the offset.

Therefore, we have to add code to the 24 bit accessor functions
that adjusts the register number for these exended registers.

The formula finally used was developed and proposed by
Andy Shevchenko <andy.shevchenko@gmail.com>.
Suggested-by: NAndy Shevchenko <andy.shevchenko@gmail.com>
Signed-off-by: NH. Nikolaus Schaller <hns@goldelico.com>
Reviewed-by: NAndy Shevchenko <andy.shevchenko@gmail.com>
Signed-off-by: NLinus Walleij <linus.walleij@linaro.org>

These mask bits are to be used to map the extended register
addresses (which are defined for an unsupported 8-bit pcal chip)
to 16 and 24 bit chips (pcal6524).
Signed-off-by: NH. Nikolaus Schaller <hns@goldelico.com>
Reviewed-by: NAndy Shevchenko <andy.shevchenko@gmail.com>
Signed-off-by: NLinus Walleij <linus.walleij@linaro.org>

The of_device_table is missing the PCA_PCAL flag so the
pcal6524 would be operated in tca6424 compatibility mode which
does not handle the new interrupt mask registers.
Suggested-by: NAndy Shevchenko <andy.shevchenko@gmail.com>
Signed-off-by: NH. Nikolaus Schaller <hns@goldelico.com>
Reviewed-by: NAndy Shevchenko <andy.shevchenko@gmail.com>
Signed-off-by: NLinus Walleij <linus.walleij@linaro.org>

The driver stores the result of irq_set_type() in the internal variables
irq_trig_raise and irq_trig_fall, which later are used to determine
the GPIOs that must be re-configured as input. These variables retain their
value between gpiolib's  export / unexport, resulting in an incorrect
state in some cases. The corresponding bits in the variables
irq_trig_raise and irq_trig_fall should be cleared in irq_shutdown().
Signed-off-by: NDenis Grigoryev <grigoryev@fastwel.ru>
Acked-by: NAndy Shevchenko <andriy.shevchenko@linux.intel.com>
Signed-off-by: NLinus Walleij <linus.walleij@linaro.org>

In past Xilinx gpio-zynq driver was setting up gpio chip->base as 0
which was chagned to autodetection when driver was upstreamed. Older
systems, which were using this old version, setup SW stack which expects
zynq gpio base as 0 and right now there is no way how to set this up.

The patch is adding an option to setup chip->base based on aliases which
is something what some other drivers are doing too.
It means when gpio0 alias is setup then chip->base is 0. When gpio alias
is not setup gpiochip_find_base() set it up properly which is current
behavior.
Signed-off-by: NMichal Simek <michal.simek@xilinx.com>
Signed-off-by: NLinus Walleij <linus.walleij@linaro.org>

Treat DT and ACPI the same as much as possible. Note that we can't use
platform_get_irq() to get the DT interrupts as they are in the port
sub-node and hence do not have an associated platform device.

This also fixes a problem introduced with error checking when calling
platform_get_irq().
Signed-off-by: NPhil Edworthy <phil.edworthy@renesas.com>
Signed-off-by: NLinus Walleij <linus.walleij@linaro.org>

Syscon nodes can be a simple-mfd and the syscon-users then be declared
as children of this node. That way the parent-child structure can be
better represented for devices that are fully embedded in the syscon.

Therefore allow getting the syscon from the parent if neither
a special compatible nor a gpio,syscon-dev property is defined.
Signed-off-by: NHeiko Stuebner <heiko@sntech.de>
Signed-off-by: NLevin Du <djw@t-chip.com.cn>
Signed-off-by: NLinus Walleij <linus.walleij@linaro.org>

Add compatible string for R-Car E3 (r8a77990) in gpio-rcar.
Signed-off-by: NYoshihiro Shimoda <yoshihiro.shimoda.uh@renesas.com>
Reviewed-by: NSimon Horman <horms+renesas@verge.net.au>
Signed-off-by: NLinus Walleij <linus.walleij@linaro.org>

Get the driver data directly by dev_get_drvdata.
Signed-off-by: NShubhrajyoti Datta <shubhrajyoti.datta@xilinx.com>
Reviewed-by: NMichal Simek <michal.simek@xilinx.com>
Signed-off-by: NLinus Walleij <linus.walleij@linaro.org>

Remove the call to  platform_get_irq use the cached
one instead.
Signed-off-by: NShubhrajyoti Datta <shubhrajyoti.datta@xilinx.com>
Reviewed-by: NMichal Simek <michal.simek@xilinx.com>
Signed-off-by: NLinus Walleij <linus.walleij@linaro.org>

The new helper returns index of the matching string in an array.
We are going to use it here.
Signed-off-by: NAndy Shevchenko <andriy.shevchenko@linux.intel.com>
Signed-off-by: NLinus Walleij <linus.walleij@linaro.org>

It is not completely obvious that these are required and
how to use them. So we provide a tested example.
Signed-off-by: NH. Nikolaus Schaller <hns@goldelico.com>
Reviewed-by: NRob Herring <robh@kernel.org>
Signed-off-by: NLinus Walleij <linus.walleij@linaro.org>

Hardware can have a switchable Vcc supply, so let's add it to
the bindings (the current Linux driver code already supports it).
Signed-off-by: NH. Nikolaus Schaller <hns@goldelico.com>
Reviewed-by: NRob Herring <robh@kernel.org>
Signed-off-by: NLinus Walleij <linus.walleij@linaro.org>

The pcal6524 has another set of registers to fine control
the interrupt handling.
Signed-off-by: NH. Nikolaus Schaller <hns@goldelico.com>
Reviewed-by: NAndy Shevchenko <andy.shevchenko@gmail.com>
Signed-off-by: NLinus Walleij <linus.walleij@linaro.org>

PCAL chips ("L" seems to stand for "latched") have additional
registers starting at address 0x40 to control the latches,
interrupt mask, pull-up and pull down etc.
Signed-off-by: NH. Nikolaus Schaller <hns@goldelico.com>
Reviewed-by: NAndy Shevchenko <andy.shevchenko@gmail.com>
Signed-off-by: NLinus Walleij <linus.walleij@linaro.org>

which makes it easier to match them with the data sheets.
Signed-off-by: NH. Nikolaus Schaller <hns@goldelico.com>
Reviewed-by: NAndy Shevchenko <andy.shevchenko@gmail.com>
Signed-off-by: NLinus Walleij <linus.walleij@linaro.org>

Casting a pointer to u16 can produce a compiler warning such as this:

    drivers/gpio/gpio-ge.c: In function 'gef_gpio_probe':
    drivers/gpio/gpio-ge.c:83:14: warning: cast from pointer to integer of different size [-Wpointer-to-int-cast]
        gc->ngpio = (u16)of_device_get_match_data(&pdev->dev);
                    ^

Cast the pointer through a uintptr_t to avoid the warning.
Reported-by: Nkbuild test robot <lkp@intel.com>
Signed-off-by: NThierry Reding <treding@nvidia.com>
Signed-off-by: NLinus Walleij <linus.walleij@linaro.org>

There is a shifter vs vanilla mask bug here.  We want to test if 1 << 11
is set but we're testing if 0xb is set.

Fixes: 9a6c505f7df1 ("gpiolib: add hogs support for machine code")
Signed-off-by: NDan Carpenter <dan.carpenter@oracle.com>
Reviewed-by: NBartosz Golaszewski <brgl@bgdev.pl>
Signed-off-by: NLinus Walleij <linus.walleij@linaro.org>

Use of_device_get_match_data() instead of open-coding it.
Signed-off-by: NThierry Reding <treding@nvidia.com>
Signed-off-by: NLinus Walleij <linus.walleij@linaro.org>

Use of_device_get_match_data() instead of open-coding it.
Signed-off-by: NThierry Reding <treding@nvidia.com>
Signed-off-by: NLinus Walleij <linus.walleij@linaro.org>

Use of_device_get_match_data() instead of open-coding it.
Signed-off-by: NThierry Reding <treding@nvidia.com>
Signed-off-by: NLinus Walleij <linus.walleij@linaro.org>

Use of_device_get_match_data() instead of open-coding it.
Signed-off-by: NThierry Reding <treding@nvidia.com>
Signed-off-by: NLinus Walleij <linus.walleij@linaro.org>

Use of_device_get_match_data() instead of open-coding it.
Signed-off-by: NThierry Reding <treding@nvidia.com>
Signed-off-by: NLinus Walleij <linus.walleij@linaro.org>

Use of_device_get_match_data() instead of open-coding it.
Signed-off-by: NThierry Reding <treding@nvidia.com>
Signed-off-by: NLinus Walleij <linus.walleij@linaro.org>

Use of_device_get_match_data() instead of open-coding it.
Signed-off-by: NThierry Reding <treding@nvidia.com>
Signed-off-by: NLinus Walleij <linus.walleij@linaro.org>

Use of_device_get_match_data() instead of open-coding it.
Signed-off-by: NThierry Reding <treding@nvidia.com>
Signed-off-by: NLinus Walleij <linus.walleij@linaro.org>

Use of_device_get_match_data() instead of open-coding it.
Signed-off-by: NThierry Reding <treding@nvidia.com>
Signed-off-by: NLinus Walleij <linus.walleij@linaro.org>

Use of_device_get_match_data() instead of open-coding it.
Signed-off-by: NThierry Reding <treding@nvidia.com>
Signed-off-by: NLinus Walleij <linus.walleij@linaro.org>

Use of_device_get_match_data() instead of open-coding it.
Signed-off-by: NThierry Reding <treding@nvidia.com>
Signed-off-by: NLinus Walleij <linus.walleij@linaro.org>