Re: [PATCHv2] dt: bindings: Add support for CSI1 bus

[Pavel Machek <pavel@ucw.cz>]

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From: Sakari Ailus <sakari.ailus@iki.fi>

In the vast majority of cases the bus type is known to the driver(s)
since a receiver or transmitter can only support a single one. There
are cases however where different options are possible.

The existing V4L2 OF support tries to figure out the bus type and
parse the bus parameters based on that. This does not scale too well
as there are multiple serial busses that share common properties.

Some hardware also supports multiple types of busses on the same
interfaces.

Document the CSI1/CCP2 property strobe. It signifies the clock or
strobe mode.
 
Signed-off-by: Sakari Ailus <sakari.ailus@iki.fi>
Signed-off-by: Ivaylo Dimitrov <ivo.g.dimitrov.75@gmail.com>
Signed-off-by: Pavel Machek <pavel@ucw.cz>
Reviewed-By: Sebastian Reichel <sre@kernel.org>

diff --git a/Documentation/devicetree/bindings/media/video-interfaces.txt b/Documentation/devicetree/bindings/media/video-interfaces.txt
index 9cd2a36..6986fde 100644
--- a/Documentation/devicetree/bindings/media/video-interfaces.txt
+++ b/Documentation/devicetree/bindings/media/video-interfaces.txt
@@ -76,6 +76,12 @@ Optional endpoint properties
   mode horizontal and vertical synchronization signals are provided to the
   slave device (data source) by the master device (data sink). In the master
   mode the data source device is also the source of the synchronization signals.
+- bus-type: data bus type. Possible values are:
+  0 - autodetect based on other properties (MIPI CSI-2 D-PHY, parallel or Bt656)
+  1 - MIPI CSI-2 C-PHY
+  2 - MIPI CSI1
+  3 - CCP2
+  Autodetection is default, and bus-type property may be omitted in that case.
 - bus-width: number of data lines actively used, valid for the parallel busses.
 - data-shift: on the parallel data busses, if bus-width is used to specify the
   number of data lines, data-shift can be used to specify which data lines are
@@ -112,7 +118,8 @@ Optional endpoint properties
   should be the combined length of data-lanes and clock-lanes properties.
   If the lane-polarities property is omitted, the value must be interpreted
   as 0 (normal). This property is valid for serial busses only.
-
+- strobe: Whether the clock signal is used as clock or strobe. Used
+  with CCP2, for instance.
 
 Example
 -------

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