I was surprised to see this series, and this patch especially.
An almost ready to submit version of this patch with considerably more functionality has been sat around for a while but unfortunately never sent [1].
According to the link below (and my own knowledge of PPP development) Kamil is the original author of this patch, both Kamil and Martijn created the initial version of the devicetree. Given that you're using their work as a base, Kamil's authorship should be respected in the patch you submit.
Their original patch [2] contained SoBs from them and Martijn, those are both missing below. Both of their signed-off-by tags should be added before this patch hits the mailing list, and the same for Ondrej. The order also seems wrong (Ondrej should be last before you).
Support for the volume keys, accelerometer, magnetometer, GPIO LEDs, touchscreen, modem codec and audio support are all missing here, but they're included in the patches you referenced. In their current state (see Martijn's commit [1] or my 5.19 rebase [3]) the DT for these components has been worked on by several people, tested by the larger user community, and are already supported in mainline. It seems strange not to include them and just leads to a bunch of extra busywork to add them back later. It's easy enough to drop any of these nodes during review if they become an issue.
With that being said, I've left some feedback below, with it addressed and the authorship/SoB situation sorted out:
Reviewed-by: Caleb Connolly <kc@xxxxxxxxxxxxxxxx>