debugfs: a tool to print 32-bit registers

This is V2 of what I posted a few days ago. I also updates
the file in Documentation.  I Cc:d people who gave feedback.

Patch 2 uses the new tool for an existing file I didn't initially
notice (I had a victim file, but it's seriously failing compilation).
Code removal there is almost zero because Felipe Balbi already did
stuff in the way I do.

Mark Brown suggested to look at drivers/base/regmap, and actually this
may be duplicating what is already being worked on in a more general
way. My code base is earlier than regmap so I didn't notice.
Unfortunately I have no resources left to study regmap as it
deserves.

Mark, if you say this is not useful at this point, I'm fine with it; I
may return with some regbase-aware code when time permits if it's not
already there.

/alessandro

Alessandro Rubini (2):
  debugfs: add tools to printk 32-bit registers
  usb: dwc3: use debugfs_print_regs32()

 Documentation/filesystems/debugfs.txt |   32 +++++++++++-
 drivers/usb/dwc3/debugfs.c            |   15 +----
 fs/debugfs/file.c                     |   90 +++++++++++++++++++++++++++++++++
 include/linux/debugfs.h               |   26 +++++++++
 4 files changed, 150 insertions(+), 13 deletions(-)
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