The ucd9000 series chips have gpio pins. Add a gpio chip interface to the ucd
device so that users can query and set the state of the gpio pins.

Add a debugfs interface using the existing pmbus debugfs directory to provide
MFR_STATUS and the status of the gpi faults to users.

Changes since v1:
 - dropped dev_err messages
 - made gpio chip registration conditional on having gpio pins
 - made mfr_status debugfs attribute more simple

Christopher Bostic (2):
  hwmon: (ucd9000) Add gpio chip interface
  hwmon: (ucd9000) Add debugfs attributes to provide mfr_status

 drivers/hwmon/pmbus/ucd9000.c | 341 +++++++++++++++++++++++++++++++++++++++++-
 1 file changed, 340 insertions(+), 1 deletion(-)

-- 
1.8.3.1

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