dt-bindings: exynos-dp: update ports node binding for panel

This patch updates a ports node binding for panel.

With this, dp node can have a ports node which describes
a remote endpoint node that can be connected to panel or bridge
node.

Changelog v2:
- remove unnecessary properties and numbering.
- update description about eDP device.

Signed-off-by: Inki Dae <inki.dae@samsung.com>
Reviewed-by: Javier Martinez Canillas <javier@osg.samsung.com>
Acked-by: Rob Herring <robh@kernel.org>

diff --git a/Documentation/devicetree/bindings/display/exynos/exynos_dp.txt b/Documentation/devicetree/bindings/display/exynos/exynos_dp.txt
index 64693f2ebc51fa080113e86bc523e71d6c2dfa21..fe4a7a2dea9c2c3935c29ff38bf773092442f2f1 100644 (file)
--- a/Documentation/devicetree/bindings/display/exynos/exynos_dp.txt
+++ b/Documentation/devicetree/bindings/display/exynos/exynos_dp.txt
@@ -1,3 +1,20 @@
+Device-Tree bindings for Samsung Exynos Embedded DisplayPort Transmitter(eDP)
+
+DisplayPort is industry standard to accommodate the growing board adoption
+of digital display technology within the PC and CE industries.
+It consolidates the internal and external connection methods to reduce device
+complexity and cost. It also supports necessary features for important cross
+industry applications and provides performance scalability to enable the next
+generation of displays that feature higher color depths, refresh rates, and
+display resolutions.
+
+eDP (embedded display port) device is compliant with Embedded DisplayPort
+standard as follows,
+- DisplayPort standard 1.1a for Exynos5250 and Exynos5260.
+- DisplayPort standard 1.3 for Exynos5422s and Exynos5800.
+
+eDP resides between FIMD and panel or FIMD and bridge such as LVDS.
+
 The Exynos display port interface should be configured based on
 the type of panel connected to it.
 
@@ -66,8 +83,15 @@ Optional properties for dp-controller:
                Hotplug detect GPIO.
                        Indicates which GPIO should be used for hotplug
                        detection
-       -video interfaces: Device node can contain video interface port
-                           nodes according to [1].
+Video interfaces:
+  Device node can contain video interface port nodes according to [1].
+  The following are properties specific to those nodes:
+
+  endpoint node connected to bridge or panel node:
+   - remote-endpoint: specifies the endpoint in panel or bridge node.
+                     This node is required in all kinds of exynos dp
+                     to represent the connection between dp and bridge
+                     or dp and panel.
 
 [1]: Documentation/devicetree/bindings/media/video-interfaces.txt
 
@@ -111,9 +135,18 @@ Board Specific portion:
                };
 
                ports {
-                       port@0 {
+                       port {
                                dp_out: endpoint {
-                                       remote-endpoint = <&bridge_in>;
+                                       remote-endpoint = <&dp_in>;
+                               };
+                       };
+               };
+
+               panel {
+                       ...
+                       port {
+                               dp_in: endpoint {
+                                       remote-endpoint = <&dp_out>;
                                };
                        };
                };