docs: dt: submitting-patches: Avoid 'YAML' in the subject and add an example

Patches adding new device bindings should avoid 'YAML' keyword in the
subject, because all bindings are supposed to be in DT schema format,
which uses YAML.  The DT schema is welcomed only in case of patches
doing conversion.  Effectively people get confused that subject should
not contain anything else than device name after the prefix, so add two
recommended examples.

Signed-off-by: Krzysztof Kozlowski <[email protected]>
Reviewed-by: Conor Dooley <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Rob Herring (Arm) <[email protected]>

Author: krzk

Documentation/devicetree/bindings/submitting-patches.rst

@@ -21,8 +21,16 @@ I. For patch submitters
        "<binding dir>: dt-bindings: ..."
 
      The 80 characters of the subject are precious. It is recommended to not
-     use "Documentation" or "doc" because that is implied. All bindings are
-     docs. Repeating "binding" again should also be avoided.
+     use "Documentation", "doc" or "YAML" because that is implied. All
+     bindings are docs and all new bindings are supposed to be in Devicetree
+     schema format.  Repeating "binding" again should also be avoided, so for
+     a new device it is often enough for example::
+
+       "dt-bindings: iio: adc: Add ROHM BD79100G"
+
+     Conversion of other formats to DT schema::
+
+       "dt-bindings: iio: adc: adi,ad7476: Convert to DT schema"
 
   2) DT binding files are written in DT schema format using json-schema
      vocabulary and YAML file format. The DT binding files must pass validation