[PATCH 0/6 v10] gpio: Add block GPIO

[Roland Stigge]

This set of patches adds:

* Block GPIO API to gpiolib
* Sysfs support for GPIO API, to provide userland access
* Device interface for userland access (alternative to sysfs)
* Devicetree support to instantiate GPIO blocks via DT
* Example implementations in several gpio drivers since they need
  special accessor functions for block wise GPIO access
* Fix for race condition in gpiolib on device creation

Signed-off-by: Roland Stigge <stigge at antcom.de>
Tested by: Wolfgang Grandegger <wg at grandegger.com>
--

Changed since v9:
* Changed IRQ flags for device interface's poll() from IRQF_TRIGGER_FALLING
  to IRQF_SHARED
* Use block name on gpio_request
* Added spinlock for ISR manipulated data (dev interface / poll())

Changed since v8:
* Added poll() function to dev interface for IRQ handling
* Fixed gpio_block_register() in case of missing CONFIG_GPIO_SYSFS
* Fixed mask handling in sysfs interface
* Fixed get_user/put_user pointer (cast)

Changes since v7:
* Fixed error in API documentation (name arg missing in prototype)
* Fixed compile error if sysfs is missing: Moved gpio_block_is_output()
  out of sysfs-ifdef
* Added error handling to gpio_block_register()
* Added mask attribute to sysfs (although dev interface exists now)

Changes since v6:
* Changed realloc to list handling
* Added mask to kernel API
* Added device interface as userspace API
* Changed sizeof() to BITS_PER_LONG
* Fixed multiline comment style
* Documented direction setting by the user
* Documented order of handled chips in case of multiple chips in one block

Changes since v5:
* Documented sysfs: elaborated on "exported" and "values" attributes
* Documented sysfs: gpiochip is a separate class now
* Aggregated driver support patches for block gpio into one single patch
* Added gpio block driver support for twl6040 and pch

Changes since v4:
* Documented word width
* Bugfix: export/unexport on register/unregister
* Using default dev_attrs for gpio_block_class
* Fix gpiolib: race condition on device creation
* Added driver support for ucb14500, vt8500, xilinx

Changes since v3:
* Added driver support for pca953x, em, pl061, max732x, pcf857x
* Coding style improvements
* Fixed krealloc memory leak in error case
* sysfs: values in hex
* Register blocks in a list
* Narrowing lock scope
* Use S_IWUSR and S_IRUGO instead of direct octal values
* Use for_each_set_bit()
* Change from unsigned to unsigned long for masks and values

Changes since v2:
* Added sysfs support
* Added devicetree support
* Added support for lpc32xx, generic
* Added functions for GPIO block registration
* Added more error checking
* Bit remapping bugfix

Changes since v1:
* API change to 32/64 bit word, bit masks

Thanks to Ryan Mallon, Linus Walleij, Stijn Devriendt, Jean-Christophe
Plagniol-Villard, Mark Brown, Greg Kroah-Hartman, Grant Likely, Stefan
Roese and Wolfgang Grandegger for reviewing!

Roland Stigge (6):
 gpio: Add a block GPIO API to gpiolib
 gpio: Add sysfs support to block GPIO API
 gpio: Add userland device interface to block GPIO
 gpiolib: Fix default attributes for class
 gpio: Add device tree support to block GPIO API
 gpio: Add block gpio to several gpio drivers

 Documentation/ABI/testing/dev-gpioblock               |   34 
 Documentation/ABI/testing/sysfs-gpio                  |   31 
 Documentation/devicetree/bindings/gpio/gpio-block.txt |   36 
 Documentation/gpio.txt                                |   58 +
 drivers/gpio/Makefile                                 |    1 
 drivers/gpio/gpio-em.c                                |   23 
 drivers/gpio/gpio-generic.c                           |   56 +
 drivers/gpio/gpio-lpc32xx.c                           |   82 +
 drivers/gpio/gpio-max730x.c                           |   61 +
 drivers/gpio/gpio-max732x.c                           |   59 +
 drivers/gpio/gpio-pca953x.c                           |   64 +
 drivers/gpio/gpio-pcf857x.c                           |   24 
 drivers/gpio/gpio-pch.c                               |   27 
 drivers/gpio/gpio-pl061.c                             |   17 
 drivers/gpio/gpio-twl6040.c                           |   32 
 drivers/gpio/gpio-ucb1400.c                           |   23 
 drivers/gpio/gpio-vt8500.c                            |   24 
 drivers/gpio/gpio-xilinx.c                            |   44 +
 drivers/gpio/gpioblock-of.c                           |   84 +
 drivers/gpio/gpiolib.c                                |  780 ++++++++++++++++--
 include/asm-generic/gpio.h                            |   28 
 include/linux/gpio.h                                  |  125 ++
 22 files changed, 1666 insertions(+), 47 deletions(-)