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camera csi driver stack

Merged Martin Kepplinger requested to merge martin.kepplinger/linux-next:librem5___csi_nxp into imx8-current-librem5

This is a CSI driver stack with a working camera driver for the devkit: gst-launch-1.0 v4l2src ! video/x-raw,width=640,height=480 ! videoconvert ! xvimagesink -v. The csi bridge, mipi csi and the actual camera driver is out of tree.

This implements runtime PM for both camera drivers. A testscript to watch can look like this:

#!/bin/bash
cat /sys/class/regulator/regulator.8/name
cat /sys/class/regulator/regulator.8/state
cat /sys/kernel/debug/regulator/CAMERA_PWR_EN/use_count
cat /sys/class/regulator/regulator.13/name
cat /sys/class/regulator/regulator.13/state
cat /sys/kernel/debug/regulator/CAMERA1_PWR_EN/use_count
echo "---- hi846 -----"
cat /sys/bus/i2c/devices/2-0020/power/control 
cat /sys/bus/i2c/devices/2-0020/power/runtime_status
echo "---- samsung ---"
cat /sys/bus/i2c/devices/3-002d/power/control 
cat /sys/bus/i2c/devices/3-002d/power/runtime_status
echo "----------------"
cat /sys/kernel/debug/clk/clk_summary | grep -i clko2

and i2c tests would need to:

echo on > /sys/bus/i2c/devices/2-0020/power/control
echo on > /sys/bus/i2c/devices/3-002d/power/control

@dorota.czaplejewicz whenever you access the hardware, you now need to guard that with the pm calls you see in the last commit in this series (and I'm not sure if I missed something. I was not yet able to reproduce your distorted image output).

Edited by Martin Kepplinger