[PATCH RFC 00/15 v5] 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
* 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>
--

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 and Greg Kroah-Hartman for reviewing!

Roland Stigge (15):
 gpio: Add a block GPIO API to gpiolib
 gpio: Add sysfs support to block GPIO API
 gpiolib: Fix default attributes for class
 gpio: Add device tree support to block GPIO API
 gpio-max730x: Add block GPIO API
 gpio-lpc32xx: Add block GPIO API
 gpio-generic: Add block GPIO API
 gpio-pca953x: Add block GPIO API
 gpio-em: Add block GPIO API
 gpio-pl061: Add block GPIO API
 gpio-max732x: Add block GPIO API
 gpio-pcf857x: Add block GPIO API
 gpio-xilinx: Add block GPIO API
 gpio-vt8500: Add block GPIO API
 gpio-ucb1400: Add block GPIO API

 Documentation/ABI/testing/sysfs-gpio                  |    6 
 Documentation/devicetree/bindings/gpio/gpio-block.txt |   36 +
 Documentation/gpio.txt                                |   47 +
 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-pl061.c                             |   17 
 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                                |  510 ++++++++++++++++--
 include/asm-generic/gpio.h                            |   26 
 include/linux/gpio.h                                  |   87 +++
 19 files changed, 1228 insertions(+), 46 deletions(-)