usb: musb_otg_allwinner: de-constify bus_space_tags

[kevans]

Summary

The SAN interceptors simply take a bus_space_tag_t, so we're
dropping qualifiers. I don't see any particularly reason the
interceptors couldn't take a const bus_space_t, other than the fact
that I can't figure out how to make that change.

Sponsored by: Juniper Networks, Inc.
Sponsored by: Klara, Inc.

[markj]

Seems harmless to me.

other than the fact that I can't figure out how to make that change.

Does it not work because bus_space_tag_t is a pointer on some platforms but not others?

[kevans]

In D36764#834496, @markj wrote:

Seems harmless to me.

other than the fact that I can't figure out how to make that change.

Does it not work because bus_space_tag_t is a pointer on some platforms but not others?

I asked twitter because I just completely failed to understand; const bus_space_tag_t is naturally equivalent to struct bus_space * const rather than const struct bus_space *, which makes sense but I reckon means we couldn't make a useful change in the interceptors without blowing away that abstraction.