Status of Pine64 sound (Everest 8316) support?

Several Pine64 devices have an Everest 8316 or 8388 sound device.  It looks like work was started on an 8316 driver several years ago but abandoned.  The driver I found does not seem to work.  On my RockPro64 it attaches but fails to create any devices.  The attach method does not check that it is talking to a real device, trusting the device tree to have the correct address on the I2C bus.

Is there anything more recent than the changes archived at

https://people.freebsd.org/~jsm/pinebookpro/3fca90af438ac4232d6b33ee4874297089997dd6-main.diff

?

Does anybody remember if this driver was almost done or barely started?

The errors below in my /var/log/messages suggest work on I2S is also needed:

i2s0: <Rockchip I2S> mem 0xff880000-0xff880fff irq 58 on ofwbus0
Cannot set frequency for clk: clkin_i2s, error: 34
Cannot set frequency for clk: xin24m, error: 34
i2s1: <Rockchip I2S> mem 0xff890000-0xff890fff irq 59 on ofwbus0
Cannot set frequency for clk: clkin_i2s, error: 34
Cannot set frequency for clk: xin24m, error: 34
i2s2: <Rockchip I2S> mem 0xff8a0000-0xff8a0fff irq 60 on ofwbus0
Cannot set frequency for clk: clkin_i2s, error: 34
Cannot set frequency for clk: xin24m, error: 34


John Carr