linux-kernel - Re: [PATCH v19 5/5] arm64: dts: qcom: sc7180-trogdor: Add nodes for onboard USB hub

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Message-ID: <CAE-0n50TzwqM--3v7wOEP07f5x7Dk9zDayF8Q+O2MvXYWMaCBg@mail.gmail.com>
Date:   Wed, 12 Jan 2022 14:00:08 -0800
From:   Stephen Boyd <swboyd@...omium.org>
To:     Matthias Kaehlcke <mka@...omium.org>
Cc:     Alan Stern <stern@...land.harvard.edu>,
        Felipe Balbi <balbi@...nel.org>,
        Frank Rowand <frowand.list@...il.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Mathias Nyman <mathias.nyman@...el.com>,
        Rob Herring <robh+dt@...nel.org>,
        Bastien Nocera <hadess@...ess.net>,
        Krzysztof Kozlowski <krzk@...nel.org>,
        Douglas Anderson <dianders@...omium.org>,
        Peter Chen <peter.chen@...nel.org>,
        Ravi Chandra Sadineni <ravisadineni@...omium.org>,
        linux-usb@...r.kernel.org, Roger Quadros <rogerq@...nel.org>,
        Michal Simek <michal.simek@...inx.com>,
        linux-kernel@...r.kernel.org, devicetree@...r.kernel.org,
        Andy Gross <agross@...nel.org>,
        Bjorn Andersson <bjorn.andersson@...aro.org>,
        linux-arm-msm@...r.kernel.org
Subject: Re: [PATCH v19 5/5] arm64: dts: qcom: sc7180-trogdor: Add nodes for
 onboard USB hub

Quoting Matthias Kaehlcke (2022-01-12 12:51:41)
> On Wed, Jan 12, 2022 at 12:47:15PM -0800, Stephen Boyd wrote:
> > Quoting Matthias Kaehlcke (2022-01-12 11:10:48)
>
> > > diff --git a/arch/arm64/boot/dts/qcom/sc7180-trogdor.dtsi b/arch/arm64/boot/dts/qcom/sc7180-trogdor.dtsi
> > > index d4f4441179fc..cd31460b3bd6 100644
> > > --- a/arch/arm64/boot/dts/qcom/sc7180-trogdor.dtsi
> > > +++ b/arch/arm64/boot/dts/qcom/sc7180-trogdor.dtsi
> > > @@ -202,7 +202,6 @@ pp3300_hub: pp3300-hub {
> > >                 pinctrl-names = "default";
> > >                 pinctrl-0 = <&en_pp3300_hub>;
> > >
> > > -               regulator-always-on;
> > >                 regulator-boot-on;
> >
> > Is regulator-boot-on necessary?
>
> It tells the kernel that the regulator is already on at boot, and avoids an
> off-on cycle that would happen otherwise (internal reference: b/185972336).

Got it! A comment here would be helpful so we know the BIOS leaves the
regulator on.