[PATCH V5 0/2] Add OpenPiton board support

[Tianrui Wei]

This patch set is to add OpenPiton board support. Patches are split into
several parts:

- [PATCH 1/2] add OpenPiton support to mmc driver
- [PATCH 2/2] add support for OpenPiton board

Description

- for mmc driver, it's settings are automatically configured at hardware level.
  We only need to expose the memory mapped interface through U-Boot driver model
- For OpenPiton, as we need to embed the device tree blob into the bitstream,
  there is currently no itb support

Tests checks

- Able to boot Debian Linux from SD card on Digilent Genesys 2
- Checkpatch is performed, with some warnings ignored

Changelogs
- V2
  . fix styles and typos in [1/2] and [2/2]
  . add board documentation in [2/2]
- V3
  . fix styles in [1/2]
- V4
  . fix checkpatch warnings in [1/2] except MAINTAINERS
- V5
  . major changes in device tree
  . changed to OF_SEPARATE
  . formatting update for mmc

 arch/riscv/Kconfig                      |   4 +                                                                                                                                                
 arch/riscv/dts/Makefile                 |   1 +                                                                                                                                                
 arch/riscv/dts/openpiton-riscv64.dts    | 160 +++++                                                                                                                                            
 board/openpiton/riscv/Kconfig           |  42 ++                                                                                                                                               
 board/openpiton/riscv/MAINTAINERS       |   6 +                                                                                                                                                
 board/openpiton/riscv/Makefile          |   5 +                                                                                                                                                
 board/openpiton/riscv/openpiton-riscv.c |  41 ++                                                                                                                                               
 configs/openpiton_riscv64_defconfig     | 132 ++++                                                                                                                                             
 doc/board/index.rst                     |   1 +                                                                                                                                                
 doc/board/openpiton/index.rst           |   9 +                                                                                                                                                
 doc/board/openpiton/riscv64.rst         | 885 ++++++++++++++++++++++++                                                                                                                         
 drivers/mmc/Kconfig                     |   7 +                                                                                                                                                
 drivers/mmc/Makefile                    |   1 +                                                                                                                                                
 drivers/mmc/piton_mmc.c                 | 174 +++++                                                                                                                                            
 include/configs/openpiton-riscv.h       |  58 ++                                                                                                                                               
 15 files changed, 1526 insertions(+)                                                                                                                                                           
 create mode 100644 arch/riscv/dts/openpiton-riscv64.dts                                                                                                                                        
 create mode 100644 board/openpiton/riscv/Kconfig                                                                                                                                               
 create mode 100644 board/openpiton/riscv/MAINTAINERS                                                                                                                                           
 create mode 100644 board/openpiton/riscv/Makefile                                                                                                                                              
 create mode 100644 board/openpiton/riscv/openpiton-riscv.c                                                                                                                                     
 create mode 100644 configs/openpiton_riscv64_defconfig                                                                                                                                         
 create mode 100644 doc/board/openpiton/index.rst                                                                                                                                               
 create mode 100644 doc/board/openpiton/riscv64.rst                                                                                                                                             
 create mode 100644 drivers/mmc/piton_mmc.c                                                                                                                                                     
 create mode 100644 include/configs/openpiton-riscv.h   
--
2.31.1