linux-kernel - Re: [PATCH v4 8/8] arm64: dts: qcom: sc7180: Update QUSB2 V2 Phy params for SC7180 IDP device

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Date:   Tue, 4 Feb 2020 09:02:18 -0800
From:   Doug Anderson <dianders@...omium.org>
To:     Stephen Boyd <swboyd@...omium.org>
Cc:     Andy Gross <agross@...nel.org>,
        Bjorn Andersson <bjorn.andersson@...aro.org>,
        Kishon Vijay Abraham I <kishon@...com>,
        Mark Rutland <mark.rutland@....com>,
        Matthias Kaehlcke <mka@...omium.org>,
        Rob Herring <robh+dt@...nel.org>,
        Sandeep Maheswaram <sanm@...eaurora.org>,
        linux-arm-msm <linux-arm-msm@...r.kernel.org>,
        LKML <linux-kernel@...r.kernel.org>,
        "open list:OPEN FIRMWARE AND FLATTENED DEVICE TREE BINDINGS" 
        <devicetree@...r.kernel.org>
Subject: Re: [PATCH v4 8/8] arm64: dts: qcom: sc7180: Update QUSB2 V2 Phy
 params for SC7180 IDP device

Hi,

On Mon, Feb 3, 2020 at 4:53 PM Stephen Boyd <swboyd@...omium.org> wrote:
>
> Quoting Sandeep Maheswaram (2020-01-29 05:51:59)
> > Overriding the QUSB2 V2 Phy tuning parameters for SC7180 IDP device.
> >
> > Signed-off-by: Sandeep Maheswaram <sanm@...eaurora.org>
> > ---
> >  arch/arm64/boot/dts/qcom/sc7180-idp.dts | 6 ++++--
> >  1 file changed, 4 insertions(+), 2 deletions(-)
> >
> > diff --git a/arch/arm64/boot/dts/qcom/sc7180-idp.dts b/arch/arm64/boot/dts/qcom/sc7180-idp.dts
> > index 388f50a..826cf02 100644
> > --- a/arch/arm64/boot/dts/qcom/sc7180-idp.dts
> > +++ b/arch/arm64/boot/dts/qcom/sc7180-idp.dts
> > @@ -276,9 +276,11 @@
> >         vdda-pll-supply = <&vreg_l11a_1p8>;
> >         vdda-phy-dpdm-supply = <&vreg_l17a_3p0>;
> >         qcom,imp-res-offset-value = <8>;
> > -       qcom,hstx-trim-value = <QUSB2_V2_HSTX_TRIM_21_6_MA>;
> > -       qcom,preemphasis-level = <QUSB2_V2_PREEMPHASIS_5_PERCENT>;
> > +       qcom,preemphasis-level = <QUSB2_V2_PREEMPHASIS_15_PERCENT>;
> >         qcom,preemphasis-width = <QUSB2_V2_PREEMPHASIS_WIDTH_HALF_BIT>;
> > +       qcom,bias-ctrl-value = <0x22>;
> > +       qcom,charge-ctrl-value = <3>;
> > +       qcom,hsdisc-trim-value = <0>;
>
> Actually, I'd prefer it uses /bits/ 8 here if it's just 8 bits.

I have been giving the opposite advice and I thought in general Rob H
suggests against adding "/bits/ 8" unless it's absolutely needed (like
for an array).

One example from
<http://lore.kernel.org/r/97cd8c1d98d7406347e4e48f4c7383a394a2ae93.1451997697.git.oreste.salerno@tomtom.com>

> > + lp_intrvl = /bits/ 8 <0x0A>;
>
> If the size is not 32-bits, you need to state that in the description.
> There is not really much point in making these 8-bit though.

-Doug