linux-kernel - Re: [PATCH v8 08/11] drm/bridge: ti-sn65dsi86: Promote the AUX channel to its own sub-dev

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Message-ID: <CAD=FV=UZkzKG6EJFAU9jCjb-twChzCH+JtcL5a9VyO5dxSdOwA@mail.gmail.com>
Date:   Mon, 7 Jun 2021 10:07:13 -0700
From:   Doug Anderson <dianders@...omium.org>
To:     Bjorn Andersson <bjorn.andersson@...aro.org>
Cc:     Andrzej Hajda <a.hajda@...sung.com>,
        Neil Armstrong <narmstrong@...libre.com>,
        Laurent Pinchart <Laurent.pinchart@...asonboard.com>,
        Jonas Karlman <jonas@...boo.se>,
        Sam Ravnborg <sam@...nborg.org>,
        linux-arm-msm <linux-arm-msm@...r.kernel.org>,
        Linus W <linus.walleij@...aro.org>,
        Lyude Paul <lyude@...hat.com>,
        Steev Klimaszewski <steev@...i.org>,
        Rob Clark <robdclark@...omium.org>,
        Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>,
        Thierry Reding <treding@...dia.com>,
        dri-devel <dri-devel@...ts.freedesktop.org>,
        Stanislav Lisovskiy <stanislav.lisovskiy@...el.com>,
        Stephen Boyd <swboyd@...omium.org>,
        Daniel Vetter <daniel@...ll.ch>,
        David Airlie <airlied@...ux.ie>,
        Jernej Skrabec <jernej.skrabec@...il.com>,
        Robert Foss <robert.foss@...aro.org>,
        LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v8 08/11] drm/bridge: ti-sn65dsi86: Promote the AUX
 channel to its own sub-dev

Hi,

On Sat, Jun 5, 2021 at 9:40 PM Bjorn Andersson
<bjorn.andersson@...aro.org> wrote:
>
> > +     /*
> > +      * We couldn't do this pre-probe because it would confuse pinctrl.
> > +      * It would have tried to grab the same pins that the main device had.
> > +      * Set it now so that we can put the proper (sub) device in the aux
> > +      * structure and it will have the right node.
> > +      */
> > +     adev->dev.of_node = pdata->dev->of_node;
>
> I suspect the refcount of the of_node will be wrong here and upon
> removing the aux device things will be off...
>
> Instead, I think you're looking for device_set_of_node_from_dev(), which
> also sets of_node_reused, which in turn causes pinctrl_bind_pins() to be
> skipped - i.e. it seems to deal with the problem your comment describes.

You rock! This is exactly what I wanted. I wish I had thought to look
for it--I somehow just assumed that this wasn't already a solved
problem.

-Doug