[PATCH] 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.

Document the CSI1/CCP2 properties strobe_clk_inv and strobe_clock
properties. The former tells whether the strobe/clock signal is
inverted, while the latter 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>

diff --git a/Documentation/devicetree/bindings/media/video-interfaces.txt b/Documentation/devicetree/bindings/media/video-interfaces.txt
index 9cd2a36..f0523f7 100644
--- a/Documentation/devicetree/bindings/media/video-interfaces.txt
+++ b/Documentation/devicetree/bindings/media/video-interfaces.txt
@@ -76,6 +76,10 @@ 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 - CSI2
+  1 - parallel / Bt656
+  2 - CCP2
 - 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
@@ -110,9 +114,10 @@ Optional endpoint properties
   lane and followed by the data lanes in the same order as in data-lanes.
   Valid values are 0 (normal) and 1 (inverted). The length of the array
   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.
-
+- clock-inv: Clock or strobe signal inversion.
+  Possible values: 0 -- not inverted; 1 -- inverted
+- strobe: Whether the clock signal is used as clock or strobe. Used
+  with CCP2, for instance.
 
 Example
 -------


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