Add iop driver for Sunplus SP7021 SOC

This is a patch series for iop driver for Sunplus SP7021 SOC.

Sunplus SP7021 is an ARM Cortex A7 (4 cores) based SoC. It integrates
many peripherals (ex: UART, I2C, SPI, SDIO, eMMC, USB, SD card and
etc.) into a single chip. It is designed for industrial control.

Refer to:
https://sunplus-tibbo.atlassian.net/wiki/spaces/doc/overview
https://tibbo.com/store/plus1.html

Tony Huang (2):
  dt-bindings: misc: Add iop yaml file for Sunplus SP7021
  misc: Add iop driver for Sunplus SP7021

 .../devicetree/bindings/misc/sunplus,iop.yaml      |  78 ++++
 MAINTAINERS                                        |   6 +
 drivers/misc/Kconfig                               |  23 ++
 drivers/misc/Makefile                              |   1 +
 drivers/misc/sunplus_iop.c                         | 411 +++++++++++++++++++++
 5 files changed, 519 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/misc/sunplus,iop.yaml
 create mode 100644 drivers/misc/sunplus_iop.c

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2.7.4