linux-kernel - Re: [PATCH] arm64: dts: qcom: sc7180-trogdor: Remove cros-ec keyboard from detachables

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Message-ID: <CAD=FV=Wey2P_=3Lp6M8GEaoyCn1XcYFhfJwfx43a5f_8H0obwg@mail.gmail.com>
Date:   Wed, 27 Apr 2022 08:09:59 -0700
From:   Doug Anderson <dianders@...omium.org>
To:     Stephen Boyd <swboyd@...omium.org>
Cc:     Andy Gross <agross@...nel.org>,
        Bjorn Andersson <bjorn.andersson@...aro.org>,
        LKML <linux-kernel@...r.kernel.org>, patches@...ts.linux.dev,
        linux-arm-msm <linux-arm-msm@...r.kernel.org>,
        Benson Leung <bleung@...omium.org>,
        Guenter Roeck <groeck@...omium.org>,
        Hsin-Yi Wang <hsinyi@...omium.org>,
        "Joseph S. Barrera III" <joebar@...omium.org>
Subject: Re: [PATCH] arm64: dts: qcom: sc7180-trogdor: Remove cros-ec keyboard
 from detachables

Hi,

On Tue, Apr 26, 2022 at 5:17 PM Doug Anderson <dianders@...omium.org> wrote:
>
> Hi,
>
> On Tue, Apr 26, 2022 at 3:57 PM Stephen Boyd <swboyd@...omium.org> wrote:
> >
> > Trogdor devices that have a detachable keyboard still have a
> > non-detachable keyboard input device present because we include the
> > cros-ec-keyboard.dtsi snippet in the top-level sc7180-trogdor.dtsi file
> > that every variant board includes. We do this because the
> > keyboard-controller node also provides some buttons like the power
> > button and volume buttons. Unfortunately, this means we register a
> > keyboard input device that doesn't do anything on boards with a
> > detachable keyboard. Let's delete the rows/columns properties of the
> > device node to indicate that there isn't a matrix keyboard on these
> > boards.
> >
> > Cc: Benson Leung <bleung@...omium.org>
> > Cc: Guenter Roeck <groeck@...omium.org>
> > Cc: Douglas Anderson <dianders@...omium.org>
> > Cc: Hsin-Yi Wang <hsinyi@...omium.org>
> > Cc: "Joseph S. Barrera III" <joebar@...omium.org>
> > Signed-off-by: Stephen Boyd <swboyd@...omium.org>
> > ---
> >  arch/arm64/boot/dts/qcom/sc7180-trogdor-coachz.dtsi   | 5 +++++
> >  arch/arm64/boot/dts/qcom/sc7180-trogdor-homestar.dtsi | 5 +++++
> >  2 files changed, 10 insertions(+)
>
> Presumably we need to do this same thing for wormdingler [1]
>
> [1] https://lore.kernel.org/r/20220426151204.1.Id2821de5fde55ebe928e8fc87a71c8d535edb383@changeid
>
> Reviewed-by: Douglas Anderson <dianders@...omium.org>

Do we need to delay landing this patch for a release? I haven't tested
myself, but from re-reading through the code it looks as if
cros_ec_keyb_register_matrix() will return an error code if we have
the device tree patch _without_ commit 4352e23a7ff2 ("Input:
cros-ec-keyb - only register keyboard if rows/columns exist"). That
will cause it to skip registering the buttons/switches, right?

-Doug