[PATCH 4.19.y-cip 03/17] dt-bindings: display: renesas: lvds: Add renesas,companion property


Biju Das <biju.das.jz@...>
 

From: Laurent Pinchart <laurent.pinchart+renesas@ideasonboard.com>

commit f54b4df6b14fb5858bec605aee4356a2e801dddb upstream.

Add a new optional renesas,companion property to point to the companion
LVDS encoder. This is used to support dual-link operation where the main
LVDS encoder splits even-numbered and odd-numbered pixels between the
two LVDS encoders.

The new property doesn't control the mode of operation, it only
describes the relationship between the master and companion LVDS
encoders.

Signed-off-by: Laurent Pinchart <laurent.pinchart+renesas@ideasonboard.com>
Reviewed-by: Jacopo Mondi <jacopo@jmondi.org>
Tested-by: Jacopo Mondi <jacopo+renesas@jmondi.org>
Acked-by: Sam Ravnborg <sam@ravnborg.org>
Reviewed-by: Kieran Bingham <kieran.bingham+renesas@ideasonboard.com>
Signed-off-by: Biju Das <biju.das.jz@bp.renesas.com>
---
.../bindings/display/bridge/renesas,lvds.txt | 18 ++++++++++++++----
1 file changed, 14 insertions(+), 4 deletions(-)

diff --git a/Documentation/devicetree/bindings/display/bridge/renesas,lvds.txt b/Documentation/devicetree/bindings/display/bridge/renesas,lvds.txt
index d06c25e51e9a..10e2e8e9eb20 100644
--- a/Documentation/devicetree/bindings/display/bridge/renesas,lvds.txt
+++ b/Documentation/devicetree/bindings/display/bridge/renesas,lvds.txt
@@ -41,14 +41,24 @@ OF graph bindings specified in Documentation/devicetree/bindings/graph.txt.

Each port shall have a single endpoint.

+Optional properties:
+
+- renesas,companion : phandle to the companion LVDS encoder. This property is
+ mandatory for the first LVDS encoder on D3 and E3 SoCs, and shall point to
+ the second encoder to be used as a companion in dual-link mode. It shall not
+ be set for any other LVDS encoder.
+

Example:

lvds0: lvds@feb90000 {
- compatible = "renesas,r8a7790-lvds";
- reg = <0 0xfeb90000 0 0x1c>;
- clocks = <&cpg CPG_MOD 726>;
- resets = <&cpg 726>;
+ compatible = "renesas,r8a77990-lvds";
+ reg = <0 0xfeb90000 0 0x20>;
+ clocks = <&cpg CPG_MOD 727>;
+ power-domains = <&sysc R8A77990_PD_ALWAYS_ON>;
+ resets = <&cpg 727>;
+
+ renesas,companion = <&lvds1>;

ports {
#address-cells = <1>;
--
2.17.1

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