1. e632f5e linux/io.h: import generic ioread* / iowrite* accessors from Linux by Masahiro Yamada · Sat Aug 26 01:02:39 2017 +0900
  2. 332b829 linux/io.h: add generic ioremap()/iounmap() defines by Masahiro Yamada · Tue Jun 28 10:48:42 2016 +0900
  3. ffde0cc include: introduce include/linux/io.h as a wrapper of asm/io.h by Masahiro Yamada · Fri May 15 22:05:18 2015 +0900