[PATCH v2 0/2] Improve generic DT binding documentation for media devices

[PATCH v2 0/2] Improve generic DT binding documentation for media devices

[Sakari Ailus]

Hi folks,

This set improves the DT binding documentation for media devices where
device specific documentation is lacking and also documents that explicit
documentation of all properties supported by the device is required.

- Port and endpoint numbering
- lane numbering for the data-lanes property

Sakari Ailus (2):
  dt: bindings: media: Document practices for DT bindings, ports,
    endpoints
  dt: bindings: media: Document data lane numbering without lane
    reordering

 .../devicetree/bindings/media/video-interfaces.txt   | 20 +++++++++++++++++++-
 1 file changed, 19 insertions(+), 1 deletion(-)

-- 
2.7.4

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[PATCH v2 1/2] dt: bindings: media: Document practices for DT bindings, ports, endpoints

[Sakari Ailus]

Port and endpoint numbering has been omitted in DT binding documentation
for a large number of devices. Also common properties the device uses have
been missed in binding documentation. Make it explicit that these things
need to be documented.

Signed-off-by: Sakari Ailus <sakari.ailus-VuQAYsv1563Yd54FQh9/CA@public.gmane.org>
---
 .../devicetree/bindings/media/video-interfaces.txt        | 15 +++++++++++++++
 1 file changed, 15 insertions(+)

diff --git a/Documentation/devicetree/bindings/media/video-interfaces.txt b/Documentation/devicetree/bindings/media/video-interfaces.txt
index 852041a..3c5382f 100644
--- a/Documentation/devicetree/bindings/media/video-interfaces.txt
+++ b/Documentation/devicetree/bindings/media/video-interfaces.txt
@@ -55,6 +55,21 @@ divided into two separate ITU-R BT.656 8-bit busses.  In such case bus-width
 and data-shift properties can be used to assign physical data lines to each
 endpoint node (logical bus).
 
+Documenting bindings for devices
+--------------------------------
+
+All required and optional bindings the device supports shall be explicitly
+documented in device DT binding documentation. This also includes port and
+endpoint numbering for the device.
+
+Port and endpoint numbering
+---------------------------
+
+Old binding documentation may have omitted explicitly specifying port and
+endpoint numbers. This often applies to devices that have a single port and a
+single endpoint in that port. In this case, the only valid port number for such
+a device is zero. The same applies for devices for which bindings do not
+document endpoint numbering: only zero is a valid endpoint.
 
 Required properties
 -------------------
-- 
2.7.4

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[PATCH v2 2/2] dt: bindings: media: Document data lane numbering without lane reordering

[Sakari Ailus]

Most devices do not support lane reordering and in many cases the
documentation of the data-lanes property is incomplete for such devices.
Document that in case the lane reordering isn't supported, monotonically
incremented values from 0 or 1 shall be used.

Signed-off-by: Sakari Ailus <sakari.ailus-VuQAYsv1563Yd54FQh9/CA@public.gmane.org>
Acked-by: Rob Herring <robh-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org>
---
 Documentation/devicetree/bindings/media/video-interfaces.txt | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/Documentation/devicetree/bindings/media/video-interfaces.txt b/Documentation/devicetree/bindings/media/video-interfaces.txt
index 3c5382f..4b09a34 100644
--- a/Documentation/devicetree/bindings/media/video-interfaces.txt
+++ b/Documentation/devicetree/bindings/media/video-interfaces.txt
@@ -114,7 +114,10 @@ Optional endpoint properties
   determines the logical lane number, while the value of an entry indicates
   physical lane, e.g. for 2-lane MIPI CSI-2 bus we could have
   "data-lanes = <1 2>;", assuming the clock lane is on hardware lane 0.
-  This property is valid for serial busses only (e.g. MIPI CSI-2).
+  If the hardware does not support lane reordering, monotonically
+  incremented values shall be used from 0 or 1 onwards, depending on
+  whether or not there is also a clock lane. This property is valid for
+  serial busses only (e.g. MIPI CSI-2).
 - clock-lanes: an array of physical clock lane indexes. Position of an entry
   determines the logical lane number, while the value of an entry indicates
   physical lane, e.g. for a MIPI CSI-2 bus we could have "clock-lanes = <0>;",
-- 
2.7.4

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