> # ./exercise-i2c-demux.sh > I2C Demux: i2c-8 > Master: 1:/i2c@e650800 > [ 97.694487] i2c-rcar e6508000.i2c: probed 0 (1) > Master: 0:/i2c@e650000 > [ 102.706365] i2c-demux-pinctrl i2c-8: failed to setup demux-adapter 0 (-19) 0 (0) Confirmed :( Got today only this far that the ENODEV comes from the PFC driver. CONFIG_DEBUG_PINCTRL is a good idea for further debugging probably. > 3.1 Unfortunately it fails for the I2C2 dmux if the GPIO fallback is > present. Hopefully the same issue. > 3.2 The test also fails for the I2C3 demux but that appears to be due > to a shortcoming in the voltage regulator code which does not > appear to like being reinitialised. The kernel complains as follows: Yes, the demuxer trigger re-bind cycles which are not well considered and/or tested. E.g. for soc-camera, this patch needed to go upstream: https://patchwork.linuxtv.org/patch/32473/
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