linux-kernel - Re: [PATCH v1 3/3] arm64: dts: qcom: sdm845: Add SD nodes for sdm845-mtp

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Message-ID: <CAE=gft7ffHt8GzyZXzG0uJdYUSmzWk7mGu7Y-E=Oh+PSBQoepg@mail.gmail.com>
Date:   Wed, 5 Dec 2018 13:43:46 -0800
From:   Evan Green <evgreen@...omium.org>
To:     Doug Anderson <dianders@...omium.org>
Cc:     Andy Gross <andy.gross@...aro.org>, robh+dt@...nel.org,
        Bjorn Andersson <bjorn.andersson@...aro.org>,
        devicetree@...r.kernel.org, linux-arm-msm@...r.kernel.org,
        linux-kernel@...r.kernel.org, David Brown <david.brown@...aro.org>,
        mark.rutland@....com, linux-soc@...r.kernel.org
Subject: Re: [PATCH v1 3/3] arm64: dts: qcom: sdm845: Add SD nodes for sdm845-mtp

On Wed, Dec 5, 2018 at 1:19 PM Doug Anderson <dianders@...omium.org> wrote:
>
> Hi,
>
> On Wed, Nov 28, 2018 at 2:34 PM Evan Green <evgreen@...omium.org> wrote:
> > +&sdhc_2 {
> > +       status = "okay";
> > +
> > +       pinctrl-names = "default";
> > +       pinctrl-0 = <&sdc2_clk &sdc2_cmd &sdc2_data &sd_cd_odl>;
> > +
> > +       vmmc-supply = <&vreg_l21a_2p95>;
> > +       vqmmc-supply = <&vddpx_2>;
> > +
> > +       cd-gpios = <&tlmm 126 GPIO_ACTIVE_LOW>;
> > +};
> > +
> >  &qupv3_id_1 {
>
> Please sort alphabetically.  "s" comes after "q".

I've got A through F down cold, but those later letters are spotty :) Will fix.

>
>
> > +       /* It seems that mmc_test reports errors if drive strength is not 16. */
>
> Possibly put this comment right next to one of the the "drive-strength" lines?

Ok.

>
>
> > +       sd_cd_odl: sd-cd-odl {
>
> "sd_cd_odl" is the name on a different board.  On sdm845 this is
> 'sd_card_det_n", so it'd be better to use that name.
>
>
> > +               pinmux {
> > +                       pins = "gpio126";
> > +                       function = "gpio";
> > +               };
> > +
> > +               pinconf {
> > +                       pins = "gpio126";
> > +                       bias-pull-up;
> > +                       drive-strength = <2>;
>
> Maybe leave this off?  According to Bjorn's research "drive-strength"
> has no affect on inputs and this is most certainly an input.

Sure. Spin coming up.

>
> -Doug