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From: Douglas Anderson <dianders@chromium.org>
To: Andrzej Hajda <a.hajda@samsung.com>,
	Neil Armstrong <narmstrong@baylibre.com>,
	Laurent Pinchart <Laurent.pinchart@ideasonboard.com>,
	Jonas Karlman <jonas@kwiboo.se>,
	Jernej Skrabec <jernej.skrabec@siol.net>,
	Sam Ravnborg <sam@ravnborg.org>
Cc: 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@vger.kernel.org,
	Maarten Lankhorst <maarten.lankhorst@linux.intel.com>,
	Linus W <linus.walleij@linaro.org>,
	dri-devel@lists.freedesktop.org, robdclark@chromium.org,
	Steev Klimaszewski <steev@kali.org>,
	Douglas Anderson <dianders@chromium.org>,
	Daniel Vetter <daniel@ffwll.ch>, David Airlie <airlied@linux.ie>,
	Laurent Pinchart <laurent.pinchart@ideasonboard.com>,
	Rob Herring <robh+dt@kernel.org>,
	Sandeep Panda <spanda@codeaurora.org>,
	devicetree@vger.kernel.org, linux-kernel@vger.kernel.org
Subject: [PATCH v7 03/10] dt-bindings: drm/bridge: ti-sn65dsi86: Add aux-bus child
Date: Mon, 17 May 2021 13:09:00 -0700	[thread overview]
Message-ID: <20210517130450.v7.3.I98bf729846c37c4c143f6ab88b1e299280e2fe26@changeid> (raw)
In-Reply-To: <20210517200907.1459182-1-dianders@chromium.org>

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:
+    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 {
+            compatible = "boe,nv133fhm-n62";
+            power-supply = <&pp3300_dx_edp>;
+            backlight = <&backlight>;
+            hpd-gpios = <&sn65dsi86_bridge 2 GPIO_ACTIVE_HIGH>;
+
+            port {
+              panel_in_edp: endpoint {
+                remote-endpoint = <&sn65dsi86_out>;
+              };
+            };
+          };
+        };
       };
     };
   - |
-- 
2.31.1.751.gd2f1c929bd-goog


  parent reply	other threads:[~2021-05-17 20:09 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 ` Douglas Anderson [this message]
2021-05-19 20:01   ` [PATCH v7 03/10] dt-bindings: drm/bridge: ti-sn65dsi86: Add aux-bus child Rob Herring
2021-05-19 21:06     ` Doug Anderson
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

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