Hi Baruch,

On Thu, Jan 12, 2017 at 02:06:03PM +0200, Baruch Siach wrote:

Hi Pavel,

On Wed, Jan 11, 2017 at 11:53:35PM +0100, Pavel Machek wrote:

quoted

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 <redacted>
Signed-off-by: Pavel Machek <redacted>

diff --git a/Documentation/devicetree/bindings/media/video-interfaces.txt b/Documentation/devicetree/bindings/media/video-interfaces.txt
index 9cd2a36..08c4498 100644
--- a/Documentation/devicetree/bindings/media/video-interfaces.txt
+++ b/Documentation/devicetree/bindings/media/video-interfaces.txt

@@ -76,6 +76,11 @@ 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 - MIPI CSI2
+  1 - parallel / Bt656

Why not have separate values for parallel and BT.656?

The current implementation of V4L2 OF support digs the information from
other properties (hsync-active, vsync-active and field-even-active). If any
of them are present, the bus is considered to be a regular parallel bus ---
the Bt.656 has no such signals.

CSI-2 bus is assumed if CSI-2 specific properties can be found. However,
explicit bus type is needed as the type of the bus isn't anymore implicitly
determinable with the addition of CSI-1 and CCP2 busses: they use the same
properties.

-- 
Kind regards,

Sakari Ailus
e-mail: sakari.ailus@iki.fi	XMPP: sailus@retiisi.org.uk