Hi Luca, On Fri, Sep 04, 2020 at 11:51:40PM +0200, Luca Ceresoli wrote: > The subdev registration topic is pretty lengthy, and takes more than > half of the "V4L2 sub-devices" section. Help readers in finding their > way through the document by dedicating a subsection to > "Subdev registration". > > Each of the two registration methods takes many paragraphs, but since > adding a subsubsection would be overkill, just emphasize them in bold. I see bold being used mostly for C symbols names, I don't know if that's a kind of convention or not. I would not mind a subsection to be honest... I think the patch is good and I'll provide a tag, maybe others can provide opinions too! Reviewed-by: Jacopo Mondi <jacopo@xxxxxxxxxx> Thanks j > > Signed-off-by: Luca Ceresoli <luca@xxxxxxxxxxxxxxxx> > --- > Documentation/driver-api/media/v4l2-subdev.rst | 11 +++++++---- > 1 file changed, 7 insertions(+), 4 deletions(-) > > diff --git a/Documentation/driver-api/media/v4l2-subdev.rst b/Documentation/driver-api/media/v4l2-subdev.rst > index 9a7dddd97f5a..fb66163deb38 100644 > --- a/Documentation/driver-api/media/v4l2-subdev.rst > +++ b/Documentation/driver-api/media/v4l2-subdev.rst > @@ -138,6 +138,9 @@ ensures that width, height and the media bus pixel code are equal on both source > and sink of the link. Subdev drivers are also free to use this function to > perform the checks mentioned above in addition to their own checks. > > +Subdev registration > +~~~~~~~~~~~~~~~~~~~ > + > There are currently two ways to register subdevices with the V4L2 core. The > first (traditional) possibility is to have subdevices registered by bridge > drivers. This can be done when the bridge driver has the complete information > @@ -157,7 +160,7 @@ below. > Using one or the other registration method only affects the probing process, the > run-time bridge-subdevice interaction is in both cases the same. > > -In the synchronous case a device (bridge) driver needs to register the > +In the **synchronous** case a device (bridge) driver needs to register the > :c:type:`v4l2_subdev` with the v4l2_device: > > :c:func:`v4l2_device_register_subdev <v4l2_device_register_subdev>` > @@ -238,9 +241,9 @@ contain several subdevs that use an I2C bus, but also a subdev that is > controlled through GPIO pins. This distinction is only relevant when setting > up the device, but once the subdev is registered it is completely transparent. > > -In the asynchronous case subdevice probing can be invoked independently of the > -bridge driver availability. The subdevice driver then has to verify whether all > -the requirements for a successful probing are satisfied. This can include a > +In the **asynchronous** case subdevice probing can be invoked independently of > +the bridge driver availability. The subdevice driver then has to verify whether > +all the requirements for a successful probing are satisfied. This can include a > check for a master clock availability. If any of the conditions aren't satisfied > the driver might decide to return ``-EPROBE_DEFER`` to request further reprobing > attempts. Once all conditions are met the subdevice shall be registered using > -- > 2.28.0 >
