Hi Hans,
Thanks for the review!
On Wed, Sep 13, 2017 at 09:27:34AM +0200, Hans Verkuil wrote:
> On 09/12/2017 03:41 PM, Sakari Ailus wrote:
> > Add function v4l2_fwnode_reference_count() for counting external
>
> ???? There is no function v4l2_fwnode_reference_count()?!
It got removed during the revisions but the commit message was not changed
accordingly, I do that now.
>
> > references and v4l2_fwnode_reference_parse() for parsing them as async
> > sub-devices.
> >
> > This can be done on e.g. flash or lens async sub-devices that are not part
> > of but are associated with a sensor.
> >
> > struct v4l2_async_notifier.max_subdevs field is added to contain the
> > maximum number of sub-devices in a notifier to reflect the memory
> > allocated for the subdevs array.
>
> You forgot to remove this outdated paragraph.
Oops. Removed it now.
>
> >
> > Signed-off-by: Sakari Ailus <sakari.ailus@xxxxxxxxxxxxxxx>
> > ---
> > drivers/media/v4l2-core/v4l2-fwnode.c | 69 +++++++++++++++++++++++++++++++++++
> > 1 file changed, 69 insertions(+)
> >
> > diff --git a/drivers/media/v4l2-core/v4l2-fwnode.c b/drivers/media/v4l2-core/v4l2-fwnode.c
> > index 44ee35f6aad5..a32473f95be1 100644
> > --- a/drivers/media/v4l2-core/v4l2-fwnode.c
> > +++ b/drivers/media/v4l2-core/v4l2-fwnode.c
> > @@ -498,6 +498,75 @@ int v4l2_async_notifier_parse_fwnode_endpoints_by_port(
> > }
> > EXPORT_SYMBOL_GPL(v4l2_async_notifier_parse_fwnode_endpoints_by_port);
> >
> > +/*
> > + * v4l2_fwnode_reference_parse - parse references for async sub-devices
> > + * @dev: the device node the properties of which are parsed for references
> > + * @notifier: the async notifier where the async subdevs will be added
> > + * @prop: the name of the property
> > + *
> > + * Return: 0 on success
> > + * -ENOENT if no entries were found
> > + * -ENOMEM if memory allocation failed
> > + * -EINVAL if property parsing failed
> > + */
> > +static int v4l2_fwnode_reference_parse(
> > + struct device *dev, struct v4l2_async_notifier *notifier,
> > + const char *prop)
> > +{
> > + struct fwnode_reference_args args;
> > + unsigned int index;
> > + int ret;
> > +
> > + for (index = 0;
> > + !(ret = fwnode_property_get_reference_args(
> > + dev_fwnode(dev), prop, NULL, 0, index, &args));
> > + index++)
> > + fwnode_handle_put(args.fwnode);
> > +
> > + if (!index)
> > + return -ENOENT;
> > +
> > + /*
> > + * To-do: handle -ENODATA when "device property: Align return
> > + * codes of acpi_fwnode_get_reference_with_args" is merged.
> > + */
> > + if (ret != -ENOENT && ret != -ENODATA)
>
> So while that patch referenced in the To-do above is not merged yet,
> what does fwnode_property_get_reference_args return? ENOENT or ENODATA?
> Or ENOENT now and ENODATA later? Or vice versa?
>
> I can't tell based on that information whether this code is correct or not.
>
> The comment needs to explain this a bit better.
I'll add this:
diff --git a/drivers/media/v4l2-core/v4l2-fwnode.c b/drivers/media/v4l2-core/v4l2-fwnode.c
index a32473f95be1..74fcc3ba9ebd 100644
--- a/drivers/media/v4l2-core/v4l2-fwnode.c
+++ b/drivers/media/v4l2-core/v4l2-fwnode.c
@@ -529,6 +529,9 @@ static int v4l2_fwnode_reference_parse(
/*
* To-do: handle -ENODATA when "device property: Align return
* codes of acpi_fwnode_get_reference_with_args" is merged.
+ * Right now, both -ENODATA and -ENOENT signal the end of
+ * references where only a single error code should be used
+ * for the purpose.
*/
if (ret != -ENOENT && ret != -ENODATA)
return ret;
--
Regards,
Sakari Ailus
e-mail: sakari.ailus@xxxxxx
