linux-kernel - [PATCH 1/2] dt-bindings: display: simple: support non-default data-mapping

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Date:   Fri, 14 Apr 2023 18:11:15 +0200
From:   Johannes Zink <j.zink@...gutronix.de>
To:     thierry.reding@...il.com, sam@...nborg.org, airlied@...il.com,
        daniel@...ll.ch, robh+dt@...nel.org,
        krzysztof.kozlowski+dt@...aro.org, dri-devel@...ts.freedesktop.org,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        kernel@...gutronix.de
Cc:     Johannes Zink <j.zink@...gutronix.de>
Subject: [PATCH 1/2] dt-bindings: display: simple: support non-default data-mapping

Some Displays support more than just a single default lvds data mapping,
which can be used to run displays on only 3 LVDS lanes in the jeida-18
data-mapping mode.

Add an optional data-mapping property, analogously to panel-lvds, to
allow overriding the default data mapping.

Signed-off-by: Johannes Zink <j.zink@...gutronix.de>
---
 .../bindings/display/panel/panel-simple.yaml  | 51 +++++++++++++++++++
 1 file changed, 51 insertions(+)

diff --git a/Documentation/devicetree/bindings/display/panel/panel-simple.yaml b/Documentation/devicetree/bindings/display/panel/panel-simple.yaml
index 18241f4051d2..6e219f67dd67 100644
--- a/Documentation/devicetree/bindings/display/panel/panel-simple.yaml
+++ b/Documentation/devicetree/bindings/display/panel/panel-simple.yaml
@@ -349,6 +349,57 @@ properties:
   power-supply: true
   no-hpd: true
   hpd-gpios: true
+  data-mapping:
+    enum:
+      - jeida-18
+      - jeida-24
+      - vesa-24
+    description: |
+      The color signals mapping order.
+
+      LVDS data mappings are defined as follows.
+
+      - "jeida-18" - 18-bit data mapping compatible with the [JEIDA], [LDI] and
+        [VESA] specifications. Data are transferred as follows on 3 LVDS lanes.
+
+      Slot          0       1       2       3       4       5       6
+                ________________                         _________________
+      Clock                     \_______________________/
+                  ______  ______  ______  ______  ______  ______  ______
+      DATA0     ><__G0__><__R5__><__R4__><__R3__><__R2__><__R1__><__R0__><
+      DATA1     ><__B1__><__B0__><__G5__><__G4__><__G3__><__G2__><__G1__><
+      DATA2     ><_CTL2_><_CTL1_><_CTL0_><__B5__><__B4__><__B3__><__B2__><
+
+      - "jeida-24" - 24-bit data mapping compatible with the [DSIM] and [LDI]
+        specifications. Data are transferred as follows on 4 LVDS lanes.
+
+      Slot          0       1       2       3       4       5       6
+                ________________                         _________________
+      Clock                     \_______________________/
+                  ______  ______  ______  ______  ______  ______  ______
+      DATA0     ><__G2__><__R7__><__R6__><__R5__><__R4__><__R3__><__R2__><
+      DATA1     ><__B3__><__B2__><__G7__><__G6__><__G5__><__G4__><__G3__><
+      DATA2     ><_CTL2_><_CTL1_><_CTL0_><__B7__><__B6__><__B5__><__B4__><
+      DATA3     ><_CTL3_><__B1__><__B0__><__G1__><__G0__><__R1__><__R0__><
+
+      - "vesa-24" - 24-bit data mapping compatible with the [VESA] specification.
+        Data are transferred as follows on 4 LVDS lanes.
+
+      Slot          0       1       2       3       4       5       6
+                ________________                         _________________
+      Clock                     \_______________________/
+                  ______  ______  ______  ______  ______  ______  ______
+      DATA0     ><__G0__><__R5__><__R4__><__R3__><__R2__><__R1__><__R0__><
+      DATA1     ><__B1__><__B0__><__G5__><__G4__><__G3__><__G2__><__G1__><
+      DATA2     ><_CTL2_><_CTL1_><_CTL0_><__B5__><__B4__><__B3__><__B2__><
+      DATA3     ><_CTL3_><__B7__><__B6__><__G7__><__G6__><__R7__><__R6__><
+
+      Control signals are mapped as follows.
+
+      CTL0: HSync
+      CTL1: VSync
+      CTL2: Data Enable
+      CTL3: 0
 
 additionalProperties: false
 
-- 
2.39.2