Why LM3644 doesn't have linux driver

I found LM3642 linux driver, but LM3644,

there are some differents that LM3644 is two path flash,  who can provide this code or give some idea for me, thanks a lot.

Hi,

I think you can just refer to LM3642's driver and only make some modifications as it's just I2C device while LM3644 has more registers, that's all.