On 23/11/2021 07.58, Janne Grunau wrote:
Apple M1 has at least 5 i2c controllers. i2c0, i2c1 and i2c3 are used on all M1 Mac devices. The 2020 Mac Mini uses i2c2 and the 13-inch MacBook Pro uses i2c2 and i2c4.
On further testing: i2c3 is not used on the 1GbE variant of j274. iBoot actually kills the node entirely. The interesting thing is it doesn't work; it times out probe transactions. I suspect iBoot does not enable its clock or something like that.
I'll poke around this on IRC, but a priori we probably need m1n1 code to kill this node when the ADT doesn't have it. Maybe I should generalize the dwc3 killing code...
-- Hector Martin (marcan@xxxxxxxxx) Public Key: https://mrcn.st/pub
