From: Rob Clark <robdclark@xxxxxxxxxxxx>
The panel-id property in chosen can be used to communicate which panel,
of multiple possibilities, is installed.
Signed-off-by: Rob Clark <robdclark@xxxxxxxxxxxx>
---
Documentation/devicetree/bindings/chosen.txt | 69 ++++++++++++++++++++
1 file changed, 69 insertions(+)
diff --git a/Documentation/devicetree/bindings/chosen.txt b/Documentation/devicetree/bindings/chosen.txt
index 45e79172a646..d502e6489b8b 100644
--- a/Documentation/devicetree/bindings/chosen.txt
+++ b/Documentation/devicetree/bindings/chosen.txt
@@ -68,6 +68,75 @@ on PowerPC "stdout" if "stdout-path" is not found. However, the
"linux,stdout-path" and "stdout" properties are deprecated. New platforms
should only use the "stdout-path" property.
+panel-id
+--------
+
+For devices that have multiple possible display panels (multi-sourcing the
+display panels is common on laptops, phones, tablets), this allows the
+bootloader to communicate which panel is installed, e.g.
+
+/ {
+ chosen {
+ panel-id = <0xc4>;
+ };
+
+ ivo_panel {
+ compatible = "ivo,m133nwf4-r0";
+ power-supply = <&vlcm_3v3>;
+ no-hpd;
+
+ ports {
+ port {
+ ivo_panel_in_edp: endpoint {
+ remote-endpoint = <&sn65dsi86_out_ivo>;
+ };
+ };
+ };
+ };
+
+ boe_panel {
+ compatible = "boe,nv133fhm-n61";
+ power-supply = <&vlcm_3v3>;
+ no-hpd;
+
+ ports {
+ port {
+ boe_panel_in_edp: endpoint {
+ remote-endpoint = <&sn65dsi86_out_boe>;
+ };
+ };
+ };
+ };
+
+ display_or_bridge_device {
+
+ ports {
+ #address-cells = <1>;
+ #size-cells = <0>;
+
+ ...
+
+ port@0 {
+ #address-cells = <1>;
+ #size-cells = <0>;
+ reg = <0>;
+
+ endpoint@c4 {
+ reg = <0xc4>;
+ remote-endpoint = <&boe_panel_in_edp>;
+ };
+
+ endpoint@c5 {
+ reg = <0xc5>;
+ remote-endpoint = <&ivo_panel_in_edp>;
+ };
+ };
+ };
+ }
+};
+
+Note that panel-id values can be sparse (ie. not just integers 0..n).
+
linux,booted-from-kexec
-----------------------
--
2.20.1
