linux-kernel - Re: [v2 1/3] arm64: dts: qcom: sc7280: herobrine: Add pinconf settings for mi2s1

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Message-ID: <CAE-0n53x6KJPz_Jc7terJB2AtLAHFo4kKZ98kAbUi8xckeCs_A@mail.gmail.com>
Date:   Fri, 20 May 2022 14:01:45 -0700
From:   Stephen Boyd <swboyd@...omium.org>
To:     Doug Anderson <dianders@...omium.org>
Cc:     Andy Gross <agross@...nel.org>,
        Judy Hsiao <judyhsiao@...omium.org>,
        Bjorn Andersson <bjorn.andersson@...aro.org>,
        Rob Herring <robh+dt@...nel.org>,
        Srini Kandagatla <srinivas.kandagatla@...aro.org>,
        Matthias Kaehlcke <mka@...omium.org>,
        Jimmy Cheng-Yi Chiang <cychiang@...gle.com>,
        Judy Hsiao <judyhsiao@...gle.com>,
        Tzung-Bi Shih <tzungbi@...omium.org>,
        Linux ARM <linux-arm-kernel@...ts.infradead.org>,
        linux-arm-msm <linux-arm-msm@...r.kernel.org>,
        devicetree@...r.kernel.org, LKML <linux-kernel@...r.kernel.org>
Subject: Re: [v2 1/3] arm64: dts: qcom: sc7280: herobrine: Add pinconf
 settings for mi2s1

Quoting Doug Anderson (2022-05-20 13:39:21)
> On Fri, May 20, 2022 at 1:38 PM Stephen Boyd <swboyd@...omium.org> wrote:
> >
> > Quoting Judy Hsiao (2022-05-20 09:10:02)
> > > +};
> > > +
> > > +&mi2s1_sclk {
> > > +       drive-strength = <6>;
> > > +       bias-disable;
> >
> > Is there an external pull on this line? If so please add that details as
> > a comment like we do for other external pulls.
>
> Actually, I think they are output lines, which is why they have a
> drive-strength. I think for output lines we don't usually comment
> about why we're disabling the pulls, only for input lines?

Ok makes sense. Even for an open drain signal it would be an "input" so
that rule still applies?