Copy stable/10@r272459 to releng/10.1 as part of
the 10.1-RELEASE process.

Approved by: re (implicit)
Sponsored by: The FreeBSD Foundation

MFC r267021:

FreeBSD, historically, has always used 8-bit addresses for i2c devices
(7-bit device address << 1), always leaving the room for the read/write
bit.

This commit convert ti_i2c and revert r259127 on bcm2835_bsc to make them
compatible with 8-bit addresses. Previous to this commit an i2c device
would have different addresses depending on the controller it was attached
to (by example, when compared to any iicbb(4) based i2c controller), which
was a pretty annoying behavior.

Also, update the PMIC i2c address on beaglebone* DTS files to match the
new address scheme.

Now the userland utilities need to do the correct slave address shifting
(but it is going to work with any i2c controller on the system).

Discussed with: ian

MFC r267834:

Clarify the expected usage of I2C 7-bit slave addresses on ioctl(2)
interface.

While here add the cross reference to iic(4) on iicbus(4).

CR: D210
Suggested by: jmg

MFC r261410

Follow r261352 by updating all drivers which are children of simplebus
to check the status property in their probe routines.

MFC r256959:

Add the Raspberry Pi BSC (I2C compliant) controller driver.

Reviewed by: rpaulo

MFC r256961:

Enable the build of OFW I2C bus for FDT systems.

MFC r258045:

As all the IIC controllers on system uses the same 'iichb' prefix we cannot
rely only on checking the device unit to indentify the BSC unit we are
attaching to. Make use of the device base address to identify our BSC unit.

MFC r259127:

Bring the RPi I2C driver in line with ti_i2c. Make it treat any slave
address as a 7-bit address.

Approved by: adrian (mentor)

Add the Raspberry Pi BSC (I2C compliant) controller driver.

Reviewed by: rpaulo
Approved by: adrian (mentor)