With the CL series leading to CL:643906 the audio configuration becomes more dynamic and is partially defined in the device tree. One thing that remains static are the DAPM routes. This seems to work, at least for now, however the kernel emits warnings when it doesn't find elements specified in the routes because a device doesn't have the corresponding codec:

[    2.475501] rk3399-gru-sound sound: ASoC: no sink widget found for DMIC1L
[    2.475503] rk3399-gru-sound sound: ASoC: Failed to add route Int Mic -> direct -> DMIC1L
[    2.475505] rk3399-gru-sound sound: ASoC: no sink widget found for DMIC1R
[    2.475507] rk3399-gru-sound sound: ASoC: Failed to add route Int Mic -> direct -> DMIC1R

The above trace is from scarlet, which doesn't have the rt5514.

This could be fixed by moving the specification of the audio routes to the device tree (rockchip,rk3399-gru-sound binding).