On Tue, Dec 05, 2017 at 04:03:55PM +0530, Archit Taneja wrote:
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@codeaurora.org
.../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.
Are there any panels with no control bus? I've never seen one, but it should be possible if LVDS panels can power on without commands.
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 {
Drop unit-address and #*-cells.
bridge_mipi_in: endpoint {remote-endpoint = <&host_mipi_out>;};};};};- };
- dsi-host {
...ports {#address-cells = <1>;#size-cells = <0>;...port@0 {
Drop unit-address and #*-cells.
host_mipi_out: endpoint {remote-endpoint = <&bridge_mipi_in>;};};};- };
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