linux.git/Documentation/gpio, branch v4.15

Merge branch 'gpio-irqchip-rework' of /home/linus/linux-gpio into devel

2017-11-09T08:38:42+00:00

gpio: Move irq_valid_mask into struct gpio_irq_chip

2017-11-08T13:10:18+00:00

In order to consolidate the multiple ways to associate an IRQ chip with
a GPIO chip, move more fields into the new struct gpio_irq_chip.

Signed-off-by: Thierry Reding 
Acked-by: Grygorii Strashko 
Signed-off-by: Linus Walleij

gpio: Move irqdomain into struct gpio_irq_chip

2017-11-08T13:06:21+00:00

In order to consolidate the multiple ways to associate an IRQ chip with
a GPIO chip, move more fields into the new struct gpio_irq_chip.

Signed-off-by: Thierry Reding 
Acked-by: Grygorii Strashko 
Signed-off-by: Linus Walleij

gpio: Introduce ->get_multiple callback

2017-10-19T20:32:39+00:00

SPI-attached GPIO controllers typically read out all inputs in one go.
If callers desire the values of multipe inputs, ideally a single readout
should take place to return the desired values.  However the current
driver API only offers a ->get callback but no ->get_multiple (unlike
->set_multiple, which is present).  Thus, to read multiple inputs, a
full readout needs to be performed for every single value (barring
driver-internal caching), which is inefficient.

In fact, the lack of a ->get_multiple callback has been bemoaned
repeatedly by the gpio subsystem maintainer:
http://www.spinics.net/lists/linux-gpio/msg10571.html
http://www.spinics.net/lists/devicetree/msg121734.html

Introduce the missing callback.  Add corresponding consumer functions
such as gpiod_get_array_value().  Amend linehandle_ioctl() to take
advantage of the newly added infrastructure.  Update the documentation.

Cc: Rojhalat Ibrahim 
Signed-off-by: Lukas Wunner 
Signed-off-by: Linus Walleij

pinctrl/gpio: Unify namespace for cross-calls

2017-09-22T09:02:10+00:00

The pinctrl_request_gpio() and pinctrl_free_gpio() break the nice
namespacing in the other cross-calls like pinctrl_gpio_foo().
Just rename them and all references so we have one namespace
with all cross-calls under pinctrl_gpio_*().

Signed-off-by: Linus Walleij

gpio: Clarify consumer stubs use-cases

2017-09-19T07:39:24+00:00

After discussion we add a few blurbs to clarify how the stubs
in the consumer API are supposed to be used.

Cc: Florian Fainelli 
Cc: Sergei Shtylyov 
Cc: Andrew Lunn 
Signed-off-by: Linus Walleij

Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/dtor/input

2017-09-07T20:39:21+00:00

Pull input updates from Dmitry Torokhov:

 - a new GPIO bit-banging driver implementing PS/2 protocol

 - a new power key driver for Rockchip RK805 PMIC

 - bunch of patches constifying various device ID structures

 - Elan I2C touchpad driver now supports devices with 2 buttons

 - other assorted fixes

* 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/dtor/input: (76 commits)
  Input: byd - make array seq static, reduces object code size
  Input: xilinx_ps2 - fix multiline comment style
  Input: pxa27x_keypad - handle return value of clk_prepare_enable
  Input: tegra-kbc - handle return value of clk_prepare_enable
  Input: PS/2 gpio bit banging driver for serio bus
  Input: xen-kbdfront - enable auto repeat for xen keyboard frontend driver
  Input: ambakmi - constify amba_id
  Input: atmel_mxt_ts - add support for reset line
  Input: atmel_mxt_ts - use more managed resources
  Input: wacom_w8001 - constify serio_device_id
  Input: tsc40 - constify serio_device_id
  Input: touchwin - constify serio_device_id
  Input: touchright - constify serio_device_id
  Input: touchit213 - constify serio_device_id
  Input: penmount - constify serio_device_id
  Input: mtouch - constify serio_device_id
  Input: inexio - constify serio_device_id
  Input: hampshire - constify serio_device_id
  Input: gunze - constify serio_device_id
  Input: fujitsu_ts - constify serio_device_id
  ...

Input: PS/2 gpio bit banging driver for serio bus

2017-08-28T17:32:10+00:00

This driver provides PS/2 serio bus support by implementing bit banging
with the GPIO API. The GPIO pins, data and clock, can be configured with
a node in the device tree or by generic device properties (GDP).

Writing to a device is supported as well, though it is possible timings
can not be halt as they are tough and difficult to reach with bit banging.
Therefore it can be configured (also in DT and GDP) whether the serio
write function should be available for clients.

This driver is for development purposes and not recommended for productive
use. However, this driver can be useful e.g. when no USB port is available
or using old peripherals is desired as PS/2 controller chips getting rare.

This driver was tested on bcm2825 and on Kirin 960 and it worked well
together with the atkbd and psmouse driver.

Signed-off-by: Danilo Krummrich 
Reviewed-by: Linus Walleij 
Acked-by: Rob Herring 
Signed-off-by: Dmitry Torokhov

pinctrl: generic: update references to Documentation/pinctrl.txt

2017-08-07T13:26:34+00:00

Update deprecated references to Documentation/pinctrl.txt since it has been
moved to Documentation/driver-api/pinctl.rst.

Signed-off-by: Ludovic Desroches 
Fixes: 5a9b73832e9e ("pinctrl.txt: move it to the driver-api book")
Signed-off-by: Linus Walleij

gpio: return NULL from gpiod_get_optional when GPIOLIB is disabled

2017-03-15T10:16:30+00:00

Given the intent behind gpiod_get_optional() and friends it does not make
sense to return -ENOSYS when GPIOLIB is disabled: the driver is expected to
work just fine without gpio so let's behave as if gpio was not found.
Otherwise we have to special-case -ENOSYS in drivers.

Note that there was objection that someone might forget to enable GPIOLIB
when dealing with a platform that has device that actually specifies
optional gpio and we'll break it. I find this unconvincing as that would
have to be the *only GPIO* in the system, which is extremely unlikely.

Signed-off-by: Dmitry Torokhov 
Signed-off-by: Linus Walleij