Re: [PATCH v3 3/4] arm64: dts: apple: t8103: Add i2c nodes

[Hector Martin]

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