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()?!
> 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You forgot to remove this outdated paragraph.
>
> 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.
> + return ret;
> +
> + ret = v4l2_async_notifier_realloc(notifier,
> + notifier->num_subdevs + index);
> + if (ret)
> + return ret;
> +
> + for (index = 0; !fwnode_property_get_reference_args(
> + dev_fwnode(dev), prop, NULL, 0, index, &args);
> + index++) {
> + struct v4l2_async_subdev *asd;
> +
> + if (WARN_ON(notifier->num_subdevs >= notifier->max_subdevs)) {
> + ret = -EINVAL;
> + goto error;
> + }
> +
> + asd = kzalloc(sizeof(*asd), GFP_KERNEL);
> + if (!asd) {
> + ret = -ENOMEM;
> + goto error;
> + }
> +
> + notifier->subdevs[notifier->num_subdevs] = asd;
> + asd->match.fwnode.fwnode = args.fwnode;
> + asd->match_type = V4L2_ASYNC_MATCH_FWNODE;
> + notifier->num_subdevs++;
> + }
> +
> + return 0;
> +
> +error:
> + fwnode_handle_put(args.fwnode);
> + return ret;
> +}
> +
> MODULE_LICENSE("GPL");
> MODULE_AUTHOR("Sakari Ailus <sakari.ailus@xxxxxxxxxxxxxxx>");
> MODULE_AUTHOR("Sylwester Nawrocki <s.nawrocki@xxxxxxxxxxx>");
>
Regards,
Hans
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