| Message ID | 20180709090751.10221-2-architt@codeaurora.org (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
On Monday 09 July 2018 02:37 PM, 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, 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> queued to drm-misc-next. Thanks, Archit > --- > .../devicetree/bindings/display/mipi-dsi-bus.txt | 71 +++++++++++++++++++--- > 1 file changed, 64 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..b7c5bf47403c 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 +30,16 @@ 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>; > + }; > + }; > + }; > + }; >
diff --git a/Documentation/devicetree/bindings/display/mipi-dsi-bus.txt b/Documentation/devicetree/bindings/display/mipi-dsi-bus.txt index 973c27273772..b7c5bf47403c 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 +30,16 @@ 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>; + }; + }; + }; + };