We spotted situation with BeagleBone where by some strange situation Ethernet PHY freezes and warm power cycle won't bring that back. It happens usually when you switch the board on which Ethernet cable is being unplugged. The device must operate remotely.
What should have help is proper power reset of TPS65217. Unfortunately the "reboot" command resets only linux by itself. It doesn't proceed proper reset sequence, i.e. ask TPS65217 to put RESET line low. While warm reboot this line stays high so Ethernet PHY cant' be reset.
Did anybody came a cross method to speak to TPS65217 by I2C and ask it for "proper RESET"?
According to the datasheet of TPS65217, I sent to password register XOR SEQ6 register and next the value I want to send. I though that SEQDWN or SEQUP can do the job. But I am simply not sure is linux permits you to save a data to it and if it does how it is executed.
I use i2ctools to speak to the chip, e.g. sudo i2cget -y -f 0 0x24 0x0B //read out i2cset -y -f 0 0x24 0x0B 0x6302 -w //write password and new value of 0x1E register.
Thanks for help