Add mt6755 basic chip support

[Mars Cheng]

This patch adds basic support for Mediatek's new 8-core chip, mt6755.
It is also named as Helio P10. It is based on 4.7-rc1

Mars Cheng (2):
  Document: DT: Add bindings for mediatek MT6755 SoC Platform
  arm64: dts: mediatek: add mt6755 support

 Documentation/devicetree/bindings/arm/mediatek.txt |    4 +
 .../interrupt-controller/mediatek,sysirq.txt       |    1 +
 .../devicetree/bindings/serial/mtk-uart.txt        |    1 +
 arch/arm64/boot/dts/mediatek/Makefile              |    1 +
 arch/arm64/boot/dts/mediatek/mt6755-phone.dts      |   39 ++++++
 arch/arm64/boot/dts/mediatek/mt6755.dtsi           |  143 ++++++++++++++++++++
 6 files changed, 189 insertions(+)
 create mode 100644 arch/arm64/boot/dts/mediatek/mt6755-phone.dts
 create mode 100644 arch/arm64/boot/dts/mediatek/mt6755.dtsi