On Thu, Oct 27, 2022 at 10:48 AM Chen-Yu Tsai <wenst@xxxxxxxxxxxx> wrote: > > On Thu, Oct 27, 2022 at 7:36 AM Nícolas F. R. A. Prado > <nfraprado@xxxxxxxxxxxxx> wrote: > > > > On Tue, Oct 25, 2022 at 01:12:49PM -0700, Chen-Yu Tsai wrote: > > > On Mon, Oct 24, 2022 at 3:01 PM Nícolas F. R. A. Prado > > > <nfraprado@xxxxxxxxxxxxx> wrote: > > > > > > > > The rt5682s codec can have two supplies: AVDD and MICVDD. They are > > > > > > The actual chip also has LDO1_IN (for digital core and charge pump) > > > and DBVDD (for I/O). However in the Chromebook designs these two > > > and AVDD are all provided from the same power rail, through separate > > > filter banks. > > > > What about rt5682 (no s), does that chip also have these same supplies? (Missed this question) The RT5682 has the same supplies, plus the VBAT one. ChenYu > > Also, since you already gave the purpose of these other supplies, could you also > > tell the purpose of AVDD, MICVDD and (for rt5682) VBAT? That way I could add > > some description for them in the binding. > > As Mark mentioned in his reply, these are quite standard names. > > AVDD is for the analog bits. MICVDD is for the microphone bias. > VBAT is called battery power in the datasheet. The block diagram > shows it going through an internal controllable LDO whose output > then powers MICVDD. This could be used in designs that don't > include a suitable external supply for MICVDD. If MICVDD is provided, > then one would turn the internal LDO off. > > So either VBAT or MICVDD has to be provided. > > ChenYu > > > Thanks, > > Nícolas > > > > > > > > Neither does the datasheet specify the ordering of AVDD, DBVDD, and > > > LDO1_IN for power sequencing, just that three should be toggled together. > > > > > > Should we model these? Or wait until some design actually splits these? > > [..]
