NXP LS1046A contains I2C controller compatible with Vybrid VF610.
Existing Vybrid MVF600 driver can be used to support it. For that purpose
declare driver as ofw_iicbus and add methods associated with ofw_iicbus.
For VF610 add dynamic clock prescaler calculation using clock information
from clock driver and clock frequency requested in device tree.
On the occasion add detach function and add additional error handling
in i2c_attach function.
Submitted by: Dawid Gorecki <dgr@semihalf.com>
Reviewed by: manu
Obtained from: Semihalf
Sponsored by: Alstom Group
Differential Revision: https://reviews.freebsd.org/D24361
Mainly focus on files that use BSD 2-Clause license, however the tool I
was using misidentified many licenses so this was mostly a manual - error
prone - task.
The Software Package Data Exchange (SPDX) group provides a specification
to make it easier for automated tools to detect and summarize well known
opensource licenses. We are gradually adopting the specification, noting
that the tags are considered only advisory and do not, in any way,
superceed or replace the license texts.
Make it clearer what each one means in the comments that define them.
IIC_BUSBSY was used in many places to mean two different things, either
"someone else has reserved the bus so you have to wait until they're done"
or "the signal level on the bus was not in the state I expected before/after
issuing some command".
Now IIC_BUSERR is used consistantly to refer to protocol/signaling errors,
and IIC_BUSBSY refers to ownership/reservation of the bus.
