Re: [PATCH v6 4/4] arm64: dts: qcom: sc8280xp-x13s: Add bluetooth

[Johan Hovold <johan@kernel.org>]

On Thu, Mar 16, 2023 at 11:26:12AM +0100, Johan Hovold wrote:
> On Wed, Mar 15, 2023 at 10:47:58PM -0500, Steev Klimaszewski wrote:
> > The Lenovo Thinkpad X13s has a WCN6855 Bluetooth controller on uart2,
> > add this.
> > 
> > Signed-off-by: Steev Klimaszewski <steev@kali.org>
> > ---
 
> > +		vreg_s1c: smps1 {
> > +			regulator-name = "vreg_s1c";
> > +			regulator-min-microvolt = <1880000>;
> > +			regulator-max-microvolt = <1900000>;
> > +			regulator-initial-mode = <RPMH_REGULATOR_MODE_HPM>;
> > +			regulator-allowed-modes = <RPMH_REGULATOR_MODE_AUTO>,
> > +						  <RPMH_REGULATOR_MODE_RET>;
> > +			regulator-allow-set-load;
> 
> So this does not look quite right still as you're specifying an initial
> mode which is not listed as allowed.
> 
> Also there are no other in-tree users of RPMH_REGULATOR_MODE_RET and
> AUTO is used to switch mode automatically which seems odd to use with
> allow-set-load.
> 
> This regulator is in fact also used by the wifi part of the chip and as
> that driver does not set any loads so we may end up with a regulator in
> retention mode while wifi is in use.
> 
> Perhaps Bjorn can enlighten us, but my guess is that this should just be
> "intial-mode = AUTO" (or even HPM, but I have no idea where this came
> from originally).

This one probably also needs to be marked as always-on as we don't
currently describe the fact that the wifi part also uses s1c.

Johan