Add a section that describes dt-bindings for peripherals that support
MIPI DSI, but have a different bus as the primary control bus. Add an
example for such peripherals.
Signed-off-by: Archit Taneja <architt@xxxxxxxxxxxxxx>
---
.../devicetree/bindings/display/mipi-dsi-bus.txt | 75 ++++++++++++++++++++--
1 file changed, 68 insertions(+), 7 deletions(-)
diff --git a/Documentation/devicetree/bindings/display/mipi-dsi-bus.txt b/Documentation/devicetree/bindings/display/mipi-dsi-bus.txt
index 973c27273772..77a7cec15f5b 100644
--- a/Documentation/devicetree/bindings/display/mipi-dsi-bus.txt
+++ b/Documentation/devicetree/bindings/display/mipi-dsi-bus.txt
@@ -16,7 +16,7 @@ The following assumes that only a single peripheral is connected to a DSI
host. Experience shows that this is true for the large majority of setups.
DSI host
---------
+========
In addition to the standard properties and those defined by the parent bus of
a DSI host, the following properties apply to a node representing a DSI host.
@@ -30,11 +30,15 @@ Required properties:
different value here. See below.
DSI peripheral
---------------
+==============
-Peripherals are represented as child nodes of the DSI host's node. Properties
-described here apply to all DSI peripherals, but individual bindings may want
-to define additional, device-specific properties.
+Peripherals with DSI as control bus
+------------------------------------
+
+Peripherals with the DSI bus as the primary control path are represented as
+child nodes of the DSI host's node. Properties described here apply to all DSI
+peripherals, but individual bindings may want to define additional,
+device-specific properties.
Required properties:
- reg: The virtual channel number of a DSI peripheral. Must be in the range
@@ -49,9 +53,25 @@ case two alternative representations can be chosen:
property is the number of the first virtual channel and the second cell is
the number of consecutive virtual channels.
-Example
--------
+Peripherals with a different control bus
+----------------------------------------
+
+There are peripherals that have I2C/SPI (or some other non-DSI bus) as the
+primary control bus, but are also connected to a DSI bus (mostly for the data
+path). Connections between such peripherals and a DSI host can be represented
+using the graph bindings [1], [2].
+
+[1] Documentation/devicetree/bindings/graph.txt
+[2] Documentation/devicetree/bindings/media/video-interfaces.txt
+Examples
+========
+- (1), (2) and (3) are examples of a DSI host and peripheral on the DSI bus
+ with different virtual channel configurations.
+- (4) is an example of a peripheral on a I2C control bus connected with to
+ a DSI host using of-graph bindings.
+
+1)
dsi-host {
...
@@ -67,6 +87,7 @@ Example
...
};
+2)
dsi-host {
...
@@ -82,6 +103,7 @@ Example
...
};
+3)
dsi-host {
...
@@ -96,3 +118,42 @@ Example
...
};
+
+4)
+ i2c-host {
+ ...
+
+ dsi-bridge@35 {
+ compatible = "...";
+ reg = <0x35>;
+
+ ports {
+ #address-cells = <1>;
+ #size-cells = <0>;
+
+ ...
+
+ port@0 {
+ bridge_mipi_in: endpoint {
+ remote-endpoint = <&host_mipi_out>;
+ };
+ };
+ };
+ };
+ };
+
+ dsi-host {
+ ...
+
+ ports {
+ #address-cells = <1>;
+ #size-cells = <0>;
+ ...
+
+ port@0 {
+ host_mipi_out: endpoint {
+ remote-endpoint = <&bridge_mipi_in>;
+ };
+ };
+ };
+ };
--
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