dt-bindings: mipi-dsi: Add info about peripherals with non-DSI control bus

Add a section that describes dt-bindings for peripherals that support
MIPI DSI, but have a different bus as the primary control bus, or no
control bus at all. Add an example for a peripheral with a non-DSI
control bus.

Reviewed-by: Rob Herring <robh@kernel.org>
Reviewed-by: Boris Brezillon <boris.brezillon@free-electrons.com>
Reviewed-by: Philippe Cornu <philippe.cornu@st.com>
Reviewed-by: Sean Paul <seanpaul@chromium.org>
Signed-off-by: Archit Taneja <architt@codeaurora.org>
Link: https://patchwork.freedesktop.org/patch/msgid/20180709090751.10221-2-architt@codeaurora.org

diff --git a/Documentation/devicetree/bindings/display/mipi-dsi-bus.txt b/Documentation/devicetree/bindings/display/mipi-dsi-bus.txt
index 973c27273772b56f673756954bd43008159afc48..b7c5bf47403c29fd0e5a12cbe8f8d6467b88ddcd 100644 (file)
--- 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 +30,16 @@ 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, or no control bus
+------------------------------------------------------
+
+Peripherals with the DSI bus as the primary control bus, or peripherals with
+no control bus but use the DSI bus to transmit pixel data 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 +54,25 @@ 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 to a
+  DSI host using of-graph bindings.
+
+1)
        dsi-host {
                ...
 
@@ -67,6 +88,7 @@ Example
                ...
        };
 
+2)
        dsi-host {
                ...
 
@@ -82,6 +104,7 @@ Example
                ...
        };
 
+3)
        dsi-host {
                ...
 
@@ -96,3 +119,37 @@ Example
 
                ...
        };
+
+4)
+       i2c-host {
+               ...
+
+               dsi-bridge@35 {
+                       compatible = "...";
+                       reg = <0x35>;
+
+                       ports {
+                               ...
+
+                               port {
+                                       bridge_mipi_in: endpoint {
+                                               remote-endpoint = <&host_mipi_out>;
+                                       };
+                               };
+                       };
+               };
+       };
+
+       dsi-host {
+               ...
+
+               ports {
+                       ...
+
+                       port {
+                               host_mipi_out: endpoint {
+                                       remote-endpoint = <&bridge_mipi_in>;
+                               };
+                       };
+               };
+       };