I understand that there is no linux driver for ad5724.
I also don't find any linux driver for similar device from the same family (AD5724/AD5734/AD5754)
Is there any idea how (and if) we can use ad5724 with Linux ?
You can adapt a driver from the AD5764 driver. They look similar, but it needs testing.
There are plenty of DAC drivers that are similar to AD5724 in one way or another; from a quick look AD5764 looks…
The easiest way, is to open a PR here: github.com/.../linux
We can review the driver there if you'd like