linux-kernel - Re: [PATCH] arm64: dts: msm8998: Add UFS phy reset

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Message-ID: <CAE=gft710gv2+k86pwVhucJFxAcN-AUZhGnT9Hm2gLutV+PCpg@mail.gmail.com>
Date:   Tue, 26 Mar 2019 12:39:08 -0700
From:   Evan Green <evgreen@...omium.org>
To:     Marc Gonzalez <marc.w.gonzalez@...e.fr>
Cc:     Andy Gross <andy.gross@...aro.org>,
        MSM <linux-arm-msm@...r.kernel.org>,
        LKML <linux-kernel@...r.kernel.org>,
        Rob Herring <robh+dt@...nel.org>,
        David Brown <david.brown@...aro.org>,
        Mark Rutland <mark.rutland@....com>
Subject: Re: [PATCH] arm64: dts: msm8998: Add UFS phy reset

On Tue, Mar 26, 2019 at 10:14 AM Marc Gonzalez <marc.w.gonzalez@...e.fr> wrote:
>
> On 26/03/2019 18:05, Evan Green wrote:
>
> > With the new refactoring at [1], the UFS phy now controls its own
> > destiny in toggling the phy reset bit within the UFS host controller.
> > Add the DT pieces needed to 1) expose the reset controller from the
> > HC, and 2) use it from the PHY. This series is based atop linux-next
> > plus Marc's series at [2].
> >
> > Signed-off-by: Evan Green <evgreen@...omium.org>
> >
> > [1] https://lore.kernel.org/lkml/20190321171800.104681-1-evgreen@chromium.org/
> > [2] https://lore.kernel.org/lkml/43768d77-80b7-9cdc-b6e0-08ec4a026c21@free.fr/
> >
> > ---
> > I haven't tested this. Marc, I'm hoping you'll test this out and hijack this
> > patch if it needs any fixups.
> >
> >  arch/arm64/boot/dts/qcom/msm8998.dtsi | 2 ++
> >  1 file changed, 2 insertions(+)
> >
> > diff --git a/arch/arm64/boot/dts/qcom/msm8998.dtsi b/arch/arm64/boot/dts/qcom/msm8998.dtsi
> > index 3d0aeb3211de..d59a2c5fe83a 100644
> > --- a/arch/arm64/boot/dts/qcom/msm8998.dtsi
> > +++ b/arch/arm64/boot/dts/qcom/msm8998.dtsi
> > @@ -990,6 +990,7 @@
> >                       interrupts = <GIC_SPI 265 IRQ_TYPE_LEVEL_HIGH>;
> >                       phys = <&ufsphy_lanes>;
> >                       phy-names = "ufsphy";
> > +                     #reset-cells = <1>;
> >                       lanes-per-direction = <2>;
> >                       power-domains = <&gcc UFS_GDSC>;
> >
> > @@ -1039,6 +1040,7 @@
> >                               <&gcc GCC_UFS_CLKREF_CLK>,
> >                               <&gcc GCC_UFS_PHY_AUX_CLK>;
> >
> > +                     resets = <&ufshc 0>;
> >                       ufsphy_lanes: lanes@...7400 {
> >                               reg = <0x01da7400 0x128>,
> >                                     <0x01da7600 0x1fc>,
> >
>
> If it's OK with you, I plan to test this patch tomorrow, and simply squash it
> into my UFS DT submission.

Sounds good, go ahead.