Bugzilla: https://bugzilla.redhat.com/show_bug.cgi?id=2071838


Tested: This is one of a series of patch sets to enable Arm SystemReady IR
 support in the kernel for NXP i.MX8 platforms.  This set updates the
 i2c subsystem.  This set has been tested via simple boot tests, use
 of i2cdetect to probe the busses, and of course the CI loop.

commit d714fb25e755ad96b699993fac47f48c4d6cebe9
Author: Jae Hyun Yoo <quic_jaehyoo@quicinc.com>
Date:   Fri Mar 18 13:41:33 2022 -0700

    i2c: add tracepoints for I2C slave events

    I2C slave events tracepoints can be enabled by:

            echo 1 > /sys/kernel/tracing/events/i2c_slave/enable

    and logs in /sys/kernel/tracing/trace will look like:

            ... i2c_slave: i2c-0 a=010 ret=0 WR_REQ []
            ... i2c_slave: i2c-0 a=010 ret=0 WR_RCV [02]
            ... i2c_slave: i2c-0 a=010 ret=0 WR_RCV [0c]
            ... i2c_slave: i2c-0 a=010 ret=0   STOP []
            ... i2c_slave: i2c-0 a=010 ret=0 RD_REQ [04]
            ... i2c_slave: i2c-0 a=010 ret=0 RD_PRO [b4]
            ... i2c_slave: i2c-0 a=010 ret=0  STOP []

    formatted as:

            i2c-<adapter_nr>
            a=<addr>
            ret=<ret>       <- callback return value
            <event>
            [<data>]

    trace printings can be selected by adding a filter like:

            echo adapter_nr==1 >/sys/kernel/tracing/events/i2c_slave/filter

Signed-off-by: Jae Hyun Yoo <quic_jaehyoo@quicinc.com>
Signed-off-by: Wolfram Sang <wsa@kernel.org>
    (cherry picked from commit d714fb25e755ad96b699993fac47f48c4d6cebe9)

Signed-off-by: Al Stone <ahs3@redhat.com>