The DSI downstream devices are likely to be Panel, Bridge and
I2C-Configured Bridge.
It is possible to connect all three devices using upstream OF-graph port
or ports node however only Panel and Bridge are possible to connect via
child node but not possible to connect I2C-Configured Bridge via child
node since I2C-Configure bridges are child of I2C not upstream DSI hosts
and it must represent them via port or ports with endpoint linking.
Allwinner A64 DSI node already has a port so add endpoint 0 for input
tcon so that the downstream DSI devices can use endpoint 1 to connect
Panel or Bridge or I2C-Configured Bridge.
An example of the I2C-Configured downstream bridge representation is,
i2c1 {
bridge@1b {
compatible = "ti,dlpc3433";
ports {
port@0 {
reg = <0>;
bridge_in_dsi: endpoint {
remote-endpoint = <&dsi_out_bridge>;
data-lanes = <1 2 3 4>;
};
};
port@2 {
reg = <2>;
bridge_out_dmd: endpoint {
remote-endpoint = <&dmd_out_bridge>;
};
};
};
};
};
dsi {
compatible = "allwinner,sun50i-a64-mipi-dsi";
port {
dsi_in_tcon0: endpoint@0 {
reg = <0>;
remote-endpoint = <tcon0_out_dsi>;
};
dsi_out_bridge: endpoint@1 {
reg = <1>;
remote-endpoint = <&bridge_in_dsi>;
};
};
};
Note that existing device bindings are untouched and still represent
the downstream devices via child nodes since the sun6i-mipi-dsi host
will migrate to a standardized single helper to lookup for a
downstream device via child or OF-graph port or port node.
Signed-off-by: Jagan Teki <ja...@amarulasolutions.com>
---
Changes for v7:
- new patch
arch/arm64/boot/dts/allwinner/sun50i-a64.dtsi | 6 +++++-
1 file changed, 5 insertions(+), 1 deletion(-)
diff --git a/arch/arm64/boot/dts/allwinner/sun50i-a64.dtsi
b/arch/arm64/boot/dts/allwinner/sun50i-a64.dtsi
index 77b5349f6087..3ed566dc2172 100644
--- a/arch/arm64/boot/dts/allwinner/sun50i-a64.dtsi
+++ b/arch/arm64/boot/dts/allwinner/sun50i-a64.dtsi
@@ -1189,7 +1189,11 @@ dsi: dsi@1ca0000 {
#size-cells = <0>;
port {
- dsi_in_tcon0: endpoint {
+ #address-cells = <1>;
+ #size-cells = <0>;
+
+ dsi_in_tcon0: endpoint@0 {
+ reg = <0>;
remote-endpoint = <&tcon0_out_dsi>;
};
};
--
2.25.1
