On Thu, 18 Jan 2018 10:23:54 +0530
Archit Taneja <architt@xxxxxxxxxxxxxx> 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.
>
> Signed-off-by: Archit Taneja <architt@xxxxxxxxxxxxxx>
Reviewed-by: Boris Brezillon <boris.brezillon@xxxxxxxxxxxxxxxxxx>
Thanks for this clarification.
Boris
> ---
> v2:
> - Mentioned what to do if peripheral has no control bus
> - Drop unit-address and #*-cells where applicable.
>
> .../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..94fb72cb916f 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 with 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>;
> + };
> + };
> + };
> + };
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