ndufresne: thx
hverkuil, in case you have time please take a look at this rfc https://patchwork.linuxtv.org/project/linux-media/cover/20210429132833.2802390-1-stanimir.varbanov@linaro.org/
svarbanov: it's on my todo list, I'm not sure I'll get to it this week, it's rather busy.