linux-arm-msm.vger.kernel.org archive mirror
 help / color / mirror / Atom feed
From: Doug Anderson <dianders@chromium.org>
To: Rob Herring <robh@kernel.org>
Cc: Andrzej Hajda <a.hajda@samsung.com>,
	Neil Armstrong <narmstrong@baylibre.com>,
	Laurent Pinchart <Laurent.pinchart@ideasonboard.com>,
	Jonas Karlman <jonas@kwiboo.se>, Sam Ravnborg <sam@ravnborg.org>,
	Stanislav Lisovskiy <stanislav.lisovskiy@intel.com>,
	Lyude Paul <lyude@redhat.com>,
	Thierry Reding <treding@nvidia.com>,
	Stephen Boyd <swboyd@chromium.org>,
	Bjorn Andersson <bjorn.andersson@linaro.org>,
	linux-arm-msm <linux-arm-msm@vger.kernel.org>,
	Maarten Lankhorst <maarten.lankhorst@linux.intel.com>,
	Linus W <linus.walleij@linaro.org>,
	dri-devel <dri-devel@lists.freedesktop.org>,
	Rob Clark <robdclark@chromium.org>,
	Steev Klimaszewski <steev@kali.org>,
	Daniel Vetter <daniel@ffwll.ch>, David Airlie <airlied@linux.ie>,
	"open list:OPEN FIRMWARE AND FLATTENED DEVICE TREE BINDINGS" 
	<devicetree@vger.kernel.org>, LKML <linux-kernel@vger.kernel.org>
Subject: Re: [PATCH v7 03/10] dt-bindings: drm/bridge: ti-sn65dsi86: Add aux-bus child
Date: Wed, 19 May 2021 14:06:04 -0700	[thread overview]
Message-ID: <CAD=FV=XNaB8fVvwwHPgo8wPmG3EmJ68u_3o8qpPXn4YobNokAA@mail.gmail.com> (raw)
In-Reply-To: <20210519200156.GA3535665@robh.at.kernel.org>

Hi,

On Wed, May 19, 2021 at 1:02 PM Rob Herring <robh@kernel.org> wrote:
>
> On Mon, May 17, 2021 at 01:09:00PM -0700, Douglas Anderson wrote:
> > We want to be able to list an eDP panel as a child of a ti-sn65dsi86
> > node to represent the fact that the panel is connected to the bridge's
> > DP AUX bus. Though the panel and the bridge chip are connected in
> > several ways, the DP AUX bus is the primary control interface between
> > the two and thus makes the most sense to model in device tree
> > hierarchy.
> >
> > Listing a panel in this way makes it possible for the panel driver to
> > easily get access to the DP AUX bus that it resides on, which can be
> > useful to help in auto-detecting the panel and for turning on various
> > bits.
> >
> > NOTE: it's still possible to continue using the bridge chip and point
> > to a panel that _isn't_ listed as a child of the bridge chip (since
> > it's worked that way previously), but that should be deprecated since
> > there is no downside to listing the panel under the bridge chip.
> >
> > The idea for this bus's design was hashed out over IRC [1].
> >
> > [1] https://people.freedesktop.org/~cbrill/dri-log/?channel=dri-devel&date=2021-05-11
> >
> > Signed-off-by: Douglas Anderson <dianders@chromium.org>
> > ---
> > Possibly we might want something fancier that could be included by
> > other eDP controller bindings. If we want to do this, I'd love to be
> > pointed at a good example to follow.
> >
> > Changes in v7:
> > - ti-sn65dsi86: Add aux-bus child patch new for v7.
> >
> >  .../bindings/display/bridge/ti,sn65dsi86.yaml | 22 ++++++++++++++++++-
> >  1 file changed, 21 insertions(+), 1 deletion(-)
> >
> > diff --git a/Documentation/devicetree/bindings/display/bridge/ti,sn65dsi86.yaml b/Documentation/devicetree/bindings/display/bridge/ti,sn65dsi86.yaml
> > index 26932d2e86ab..51f5a29e216c 100644
> > --- a/Documentation/devicetree/bindings/display/bridge/ti,sn65dsi86.yaml
> > +++ b/Documentation/devicetree/bindings/display/bridge/ti,sn65dsi86.yaml
> > @@ -70,6 +70,11 @@ properties:
> >      const: 1
> >      description: See ../../pwm/pwm.yaml for description of the cell formats.
> >
> > +  aux-bus:
>
> As this is a node:
>
> type: object
>
> > +    description:
> > +      It is recommended that you place your panel under the aux-bus node
> > +      here to represent the control hierarchy.
> > +
> >    ports:
> >      $ref: /schemas/graph.yaml#/properties/ports
> >
> > @@ -201,11 +206,26 @@ examples:
> >
> >            port@1 {
> >              reg = <1>;
> > -            endpoint {
> > +            sn65dsi86_out: endpoint {
> >                remote-endpoint = <&panel_in_edp>;
> >              };
> >            };
> >          };
> > +
> > +        aux-bus {
> > +          panel {
>
> We should perhaps have a separate aux-bus schema.

Yeah. Before spending lots of time digging into how to do this I
wanted to see if anyone was going to give me a big-old NAK on the
whole approach. ;-)

I guess I'd make a file called "dp-aux-bus.yaml" (maybe right under
bindings/display?) and then I'd include it like this:

aux-bus:
  $ref: "../dp-aux-bus.yaml#"


> Something should
> define the child node is 'panel' and nothing else.

At the moment the code also requires that the node name is 'aux-bus'.
Any objections to that?


> Though perhaps
> connectors are valid too?

They might be. We could always add it later?

  reply	other threads:[~2021-05-19 21:06 UTC|newest]

Thread overview: 26+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-05-17 20:08 [PATCH v7 00/10] drm: Fix EDID reading on ti-sn65dsi86 by introducing the DP AUX bus Douglas Anderson
2021-05-17 20:08 ` [PATCH v7 01/10] drm/panel: panel-simple: Add missing pm_runtime_dont_use_autosuspend() calls Douglas Anderson
2021-05-24 20:22   ` Laurent Pinchart
2021-05-24 21:08     ` Doug Anderson
2021-05-17 20:08 ` [PATCH v7 02/10] dt-bindings: display: simple: List hpd properties in panel-simple Douglas Anderson
2021-05-18 12:41   ` Rob Herring
2021-05-18 13:58     ` Doug Anderson
2021-05-22 10:38       ` Linus Walleij
2021-05-17 20:09 ` [PATCH v7 03/10] dt-bindings: drm/bridge: ti-sn65dsi86: Add aux-bus child Douglas Anderson
2021-05-19 20:01   ` Rob Herring
2021-05-19 21:06     ` Doug Anderson [this message]
2021-05-20 13:25       ` Rob Herring
2021-05-17 20:09 ` [PATCH v7 04/10] drm: Introduce the DP AUX bus Douglas Anderson
2021-05-22 10:34   ` Linus Walleij
2021-05-17 20:09 ` [PATCH v7 05/10] drm/panel: panel-simple: Allow panel-simple be a DP AUX endpoint device Douglas Anderson
2021-05-17 20:09 ` [PATCH v7 06/10] drm/panel: panel-simple: Stash DP AUX bus; allow using it for DDC Douglas Anderson
2021-05-17 20:09 ` [PATCH v7 07/10] drm/bridge: ti-sn65dsi86: Promote the AUX channel to its own sub-dev Douglas Anderson
2021-05-17 20:09 ` [PATCH v7 08/10] drm/bridge: ti-sn65dsi86: Add support for the DP AUX bus Douglas Anderson
2021-05-22 10:35   ` Linus Walleij
2021-05-24 20:29   ` Lyude Paul
2021-05-17 20:09 ` [PATCH v7 09/10] drm/bridge: ti-sn65dsi86: Don't read EDID blob over DDC Douglas Anderson
2021-05-17 20:09 ` [PATCH v7 10/10] arm64: dts: qcom: sc7180-trogdor: Move panel under the bridge chip Douglas Anderson
2021-05-22 10:40   ` Linus Walleij
2021-05-19 21:41 ` [PATCH v7 00/10] drm: Fix EDID reading on ti-sn65dsi86 by introducing the DP AUX bus Lyude Paul
2021-05-21 23:07 ` Lyude Paul
2021-05-24 15:14   ` Doug Anderson

Reply instructions:

You may reply publicly to this message via plain-text email
using any one of the following methods:

* Save the following mbox file, import it into your mail client,
  and reply-to-all from there: mbox

  Avoid top-posting and favor interleaved quoting:
  https://en.wikipedia.org/wiki/Posting_style#Interleaved_style

* Reply using the --to, --cc, and --in-reply-to
  switches of git-send-email(1):

  git send-email \
    --in-reply-to='CAD=FV=XNaB8fVvwwHPgo8wPmG3EmJ68u_3o8qpPXn4YobNokAA@mail.gmail.com' \
    --to=dianders@chromium.org \
    --cc=Laurent.pinchart@ideasonboard.com \
    --cc=a.hajda@samsung.com \
    --cc=airlied@linux.ie \
    --cc=bjorn.andersson@linaro.org \
    --cc=daniel@ffwll.ch \
    --cc=devicetree@vger.kernel.org \
    --cc=dri-devel@lists.freedesktop.org \
    --cc=jonas@kwiboo.se \
    --cc=linus.walleij@linaro.org \
    --cc=linux-arm-msm@vger.kernel.org \
    --cc=linux-kernel@vger.kernel.org \
    --cc=lyude@redhat.com \
    --cc=maarten.lankhorst@linux.intel.com \
    --cc=narmstrong@baylibre.com \
    --cc=robdclark@chromium.org \
    --cc=robh@kernel.org \
    --cc=sam@ravnborg.org \
    --cc=stanislav.lisovskiy@intel.com \
    --cc=steev@kali.org \
    --cc=swboyd@chromium.org \
    --cc=treding@nvidia.com \
    --subject='Re: [PATCH v7 03/10] dt-bindings: drm/bridge: ti-sn65dsi86: Add aux-bus child' \
    /path/to/YOUR_REPLY

  https://kernel.org/pub/software/scm/git/docs/git-send-email.html

* If your mail client supports setting the In-Reply-To header
  via mailto: links, try the mailto: link

This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).