linux-kernel - Re: [PATCH v10 8/9] arm64: dts: qcom: ipq9574: Add LDO regulator node

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Message-ID: <CAA8EJppubMsUrG3Vo=2W8Y6=MCBKd7OCViM30jdGAdCc8x65Ww@mail.gmail.com>
Date:   Mon, 8 May 2023 14:21:52 +0300
From:   Dmitry Baryshkov <dmitry.baryshkov@...aro.org>
To:     Varadarajan Narayanan <quic_varada@...cinc.com>
Cc:     agross@...nel.org, andersson@...nel.org, konrad.dybcio@...aro.org,
        vkoul@...nel.org, kishon@...nel.org, robh+dt@...nel.org,
        krzysztof.kozlowski+dt@...aro.org, gregkh@...uxfoundation.org,
        mturquette@...libre.com, sboyd@...nel.org, quic_wcheng@...cinc.com,
        linux-arm-msm@...r.kernel.org, linux-phy@...ts.infradead.org,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-usb@...r.kernel.org, linux-clk@...r.kernel.org
Subject: Re: [PATCH v10 8/9] arm64: dts: qcom: ipq9574: Add LDO regulator node

On Mon, 8 May 2023 at 08:17, Varadarajan Narayanan
<quic_varada@...cinc.com> wrote:
>
> On Sat, May 06, 2023 at 02:33:11PM +0300, Dmitry Baryshkov wrote:
> > On Sat, 6 May 2023 at 14:09, Varadarajan Narayanan
> > <quic_varada@...cinc.com> wrote:
> > >
> > > On Fri, May 05, 2023 at 12:29:54PM +0300, Dmitry Baryshkov wrote:
> > > > On Fri, 5 May 2023 at 11:23, Varadarajan Narayanan
> > > > <quic_varada@...cinc.com> wrote:
> > > > >
> > > > > Add LDO regulator node
> > > >
> > > > As this LDO is provided by the PMIC, it would be nice to know why it
> > > > is modelled as an always-on regulator instead of the proper PMIC
> > > > regulator. Up to now we were doing this only for the outstanding power
> > > > rails like CX/MX or EBI.
> > >
> > > These are always ON because USB phy doesn't support power
> > > collapse, and there is a chance that other IP blocks might be
> > > sharing the rail.
> >
> > You are describing the software side here. From the hardware point of
> > view, it is an I2C regulator, which is probably also exported as an
> > SMD_RPM regulator. Unless you have a good reason not to do so, there
> > should be a node under rpm-requests, which describes mp5496 regulators
> > exported via RPM. then USB should refer to those regulators.
>
> Yes. It is a part of rpm-requests. That is why have mentioned V10
> is dependent on
> https://lore.kernel.org/lkml/20230407155727.20615-1-quic_devipriy@quicinc.com/T/.
> The 4th patch of the above series
> (https://lore.kernel.org/lkml/20230407155727.20615-1-quic_devipriy@quicinc.com/T/#mea3f0ea37c53cf5e39e10cd6cf3bed5243cec629)
> adds the rpm_requests node and this regulator definition is added
> to it. Hope that is ok.

It is fine. Most probably I was mistaken by the patch itself. Please
excuse me. If this this is an RPM regulator, it's is fine and correct.

>
> Thanks
> Varada
>
> > > > > Signed-off-by: Varadarajan Narayanan <quic_varada@...cinc.com>
> > > > > ---
> > > > >  Changes in v10:
> > > > >         - Add LDO regulator node
> > > > > ---
> > > > >  arch/arm64/boot/dts/qcom/ipq9574-rdp433.dts | 7 +++++++
> > > > >  1 file changed, 7 insertions(+)
> > > > >
> > > > > diff --git a/arch/arm64/boot/dts/qcom/ipq9574-rdp433.dts b/arch/arm64/boot/dts/qcom/ipq9574-rdp433.dts
> > > > > index bdc1434..1f5d14f 100644
> > > > > --- a/arch/arm64/boot/dts/qcom/ipq9574-rdp433.dts
> > > > > +++ b/arch/arm64/boot/dts/qcom/ipq9574-rdp433.dts
> > > > > @@ -60,6 +60,13 @@
> > > > >                         regulator-min-microvolt = <725000>;
> > > > >                         regulator-max-microvolt = <1075000>;
> > > > >                 };
> > > > > +
> > > > > +               mp5496_l2: l2 {
> > > > > +                       regulator-min-microvolt = <1800000>;
> > > > > +                       regulator-max-microvolt = <1800000>;
> > > > > +                       regulator-boot-on;
> > > > > +                       regulator-always-on;
> > > > > +               };
> > > > >         };
> > > > >  };
> > > > >
> > > > > --
> > > > > 2.7.4
> > > > >
> > > >
> > > >
> > > > --
> > > > With best wishes
> > > > Dmitry
> >
> >
> >
> > --
> > With best wishes
> > Dmitry



-- 
With best wishes
Dmitry