pinctrl: add pincontrol driver for palmas device.

Changes from V1:
- Split the additon of common code into pinctrl-utils and pinconf-generic.
- Use the pinconf-generic APIs for mapping node.
- Use pinconf generic properties to define the Palmas pincontrol nodes.
- Nit and cleanups, typo fixes, rephrasing the sentences etc.
- Use pin specific APIs for setting pin configuration rather than group
  specific.

Laxman Dewangan (3):
  pinctrl: add utility functions for add map/configs
  pinctrl: pinconf-generic: add generic APIs for mapping pinctrl node
  pinctrl: palmas: add pincontrol driver

 .../bindings/pinctrl/pinctrl-bindings.txt          |   16 +
 .../devicetree/bindings/pinctrl/pinctrl-palmas.txt |   97 ++
 drivers/pinctrl/Kconfig                            |   10 +
 drivers/pinctrl/Makefile                           |    3 +-
 drivers/pinctrl/pinconf-generic.c                  |   96 ++
 drivers/pinctrl/pinctrl-palmas.c                   | 1085 ++++++++++++++++++++
 drivers/pinctrl/pinctrl-utils.c                    |  135 +++
 drivers/pinctrl/pinctrl-utils.h                    |   42 +
 include/linux/mfd/palmas.h                         |   35 +-
 include/linux/pinctrl/pinconf-generic.h            |    6 +
 10 files changed, 1513 insertions(+), 12 deletions(-)
 create mode 100644 Documentation/devicetree/bindings/pinctrl/pinctrl-palmas.txt
 create mode 100644 drivers/pinctrl/pinctrl-palmas.c
 create mode 100644 drivers/pinctrl/pinctrl-utils.c
 create mode 100644 drivers/pinctrl/pinctrl-utils.h

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