[PATCH v3] drivers:input:keyboard: add mtk keypad driver

[Fengping yu]

This patchset add support to MediaTek matrix keypad.

Change since v2:
- remove extra space and redundant lines
- remove useless code
- update keypad devicetree document debounce time unit
- change to use devm_platform_ioremap_resource() to simplify resource management
- use bitmap to store and check keypad state

fengping.yu (2):
  add dt-binding document for MediaTek Keypad
  add MediaTek keypad driver

 .../devicetree/bindings/input/mtk-kpd.txt     |  61 +++++
 arch/arm64/configs/defconfig                  |   1 +
 drivers/input/keyboard/Kconfig                |   7 +
 drivers/input/keyboard/Makefile               |   1 +
 drivers/input/keyboard/mtk-kpd.c              | 258 ++++++++++++++++++
 5 files changed, 328 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/input/mtk-kpd.txt
 create mode 100644 drivers/input/keyboard/mtk-kpd.c

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2.18.0