---
- branch: MAIN
  date: Thu Jun  7 13:30:49 UTC 2018
  files:
  - new: '1.61'
    old: '1.60'
    path: src/sys/dev/i2c/i2c.c
    pathrev: src/sys/dev/i2c/i2c.c@1.61
    type: modified
  - new: '1.13'
    old: '1.12'
    path: src/sys/dev/i2c/i2cvar.h
    pathrev: src/sys/dev/i2c/i2cvar.h@1.13
    type: modified
  id: 20180607T133049Z.b27ccc6afa35ee344f0b41928952adc1ba6eb96b
  log: "Changes / enhancements to i2c indirect device auto-configuration:\n\nâ\x80\x94
    iic_search() chooses a â\x80\x9Cprobe strategyâ\x80\x9D based on the\n  \"i2c-indirect-probe-strategyâ\x80\x9D
    property on the â\x80\x9Ciicâ\x80\x9D instance.\n  Valid values are \"smbus-quick-writeâ\x80\x9D,
    \"smbus-receive-byteâ\x80\x9D, and\n  â\x80\x9Cnoneâ\x80\x9D.  If no value is
    specified, the default is \"smbus-quick-writeâ\x80\x9D.\n\nâ\x80\x94 If the \"i2c-indirect-device-whitelistâ\x80\x9D
    exists on the â\x80\x9Ciicâ\x80\x9D instance,\n  iic_search() will first check
    the driver name in the cfdata_t against\n  this list, and only allow the match/probe
    to move forward if the\n  cfdata_t driver name is in the list.  This is primarily
    to accommodate\n  the Intel integrated memory controller neutered-i2c-thing.\n\nâ\x80\x94
    If the cfdata_t specifies a wildcard address, each address of the i2c\n  bus will
    be consulted.  If the cfdata_t contains a nailed-down address,\n  then we limit
    the bus scan to that specific address.\n\nâ\x80\x94 We explicitly skip reserved
    / special i2c addresses, such as the\n  General-Call address, etc.\n\nâ\x80\x94
    We introduce the notion of a â\x80\x9Cmatch qualityâ\x80\x9D for i2c drivers.
    \ From\n  lowest-quality to highest-quality: matched by plausible address only,\n
    \ matched by plausible address and poking at the bus to see if the\n  device looks
    reasonable, matched by direct-config â\x80\x9Ccompatibleâ\x80\x9D string,\n  matched
    by direct-config â\x80\x9Cdriver nameâ\x80\x9D string.\n\nâ\x80\x94 If the â\x80\x9Cmatch
    qualityâ\x80\x9D is merely â\x80\x9Cplausible address onlyâ\x80\x9D, then\n  iic_search()
    will use the probe strategy selected above to see if\n  a device responds to that
    address.\n"
  module: src
  subject: 'CVS commit: src/sys/dev/i2c'
  unixtime: '1528378249'
  user: thorpej