On Fri, Jun 4, 2021 at 5:31 AM Steven Lee <steven_lee@xxxxxxxxxxxxxx> wrote: > However, it might affect users who update kernel/driver from the > old kernel/driver as they may expect the gpio output pin base is start > from 80(MAX_NR_HW_SGPIO). Why? What users? In-kernel, out-of-tree-kernel or userspace users? In-kernel users can be fixed, out-of-tree kernels we don't care about and userspace should be using the character device. Just change it. Yours, Linus Walleij