On Thu, Oct 27, 2022 at 12:20 PM Nícolas F. R. A. Prado <nfraprado@xxxxxxxxxxxxx> wrote: > > On Thu, Oct 27, 2022 at 11:11:08AM -0700, Chen-Yu Tsai wrote: > > 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. > > So if I get this right we should be making the following supplies required: > AVDD > VBAT or MICVDD (on rt5682s there's no VBAT so just MICVDD) That's right. > And for LDO1_ON and DBVDD what would be the best way to model? Should we make > them required in the binding as well and add them pointing to the same regulator > from AVDD in the chromebook DT or just leave them as optional? They should be required. And we then describe them to match the board. ChenYu > Thanks, > Nícolas > > > > > > > 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? > > > > [..]
