ppc/pnv: Test pnv i2c master and connected devices

Tests the following for both P9 and P10:
- I2C master POR status
- I2C master status after immediate reset

Tests the following for powernv10-r

ppc/pnv: Test pnv i2c master and connected devices

Tests the following for both P9 and P10:
- I2C master POR status
- I2C master status after immediate reset

Tests the following for powernv10-ranier only:
- Config pca9552 hotplug device pins as inputs then
Read the INPUT0/1 registers to verify all pins are high
- Connected GPIO pin tests of P10 PCA9552 device. Tests
output of pins 0-4 affect input of pins 5-9 respectively.
- PCA9554 GPIO pins test. Tests input and ouput functionality.

Reviewed-by: Cédric Le Goater <clg@kaod.org>
Signed-off-by: Glenn Miles <milesg@linux.vnet.ibm.com>
Signed-off-by: Nicholas Piggin <npiggin@gmail.com>

show more ...