This patch add the GPIO standby controller in the APM X-Gene platform.

v1 Change:
	1. Do not access GIC register from driver.
	2. Duplicate gpio probe funtion.
	3. Function gpiochip_remove doesn't return value.

Y Vo (3):
  gpio: Add APM X-Gene standby GPIO controller driver
  Documentation: gpio: Add APM X-Gene standby GPIO controller DTS
    binding
  arm64:dts: Add APM X-Gene standby GPIO controller DTS entries

 .../devicetree/bindings/gpio/gpio-xgene-sb.txt     |  31 +++
 arch/arm64/boot/dts/apm-storm.dtsi                 |  13 ++
 drivers/gpio/Kconfig                               |   7 +
 drivers/gpio/Makefile                              |   1 +
 drivers/gpio/gpio-xgene-sb.c                       | 216 +++++++++++++++++++++
 5 files changed, 268 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/gpio/gpio-xgene-sb.txt
 create mode 100644 drivers/gpio/gpio-xgene-sb.c

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2.2.0