On 09/13/2017 09:01 AM, Hans Verkuil wrote:
> On 09/12/2017 03:41 PM, Sakari Ailus wrote:
>> This is just like like v4l2_async_notifier_parse_fwnode_endpoints but it
>> only parses endpoints on a single port. The behaviour is useful on devices
>> that have both sinks and sources, in other words only some of these should
>> be parsed.
I forgot to mention that I think the log message can be improved: it is not
clear why you would only parse some of the ports for devices that have both
sinks and sources. That should be explained better. And probably also in the
header documentation.
>
> I think it would be better to merge this patch with the preceding patch. It
> does not make a lot of sense to have this separate IMHO.
>
> That said:
>
> Acked-by: Hans Verkuil <hans.verkuil@xxxxxxxxx>
Sorry, I'm retracting this. It needs a bit more work w.r.t. commit log and
header comments.
Regards,
Hans
>
> Regards,
>
> Hans
>
>>
>> Signed-off-by: Sakari Ailus <sakari.ailus@xxxxxxxxxxxxxxx>
>> ---
>> drivers/media/v4l2-core/v4l2-fwnode.c | 59 ++++++++++++++++++++++++++++++++---
>> include/media/v4l2-fwnode.h | 59 +++++++++++++++++++++++++++++++++++
>> 2 files changed, 113 insertions(+), 5 deletions(-)
>>
>> diff --git a/drivers/media/v4l2-core/v4l2-fwnode.c b/drivers/media/v4l2-core/v4l2-fwnode.c
>> index d978f2d714ca..44ee35f6aad5 100644
>> --- a/drivers/media/v4l2-core/v4l2-fwnode.c
>> +++ b/drivers/media/v4l2-core/v4l2-fwnode.c
>> @@ -398,9 +398,9 @@ static int v4l2_async_notifier_fwnode_parse_endpoint(
>> return ret == -ENOTCONN ? 0 : ret;
>> }
>>
>> -int v4l2_async_notifier_parse_fwnode_endpoints(
>> +static int __v4l2_async_notifier_parse_fwnode_endpoints(
>> struct device *dev, struct v4l2_async_notifier *notifier,
>> - size_t asd_struct_size,
>> + size_t asd_struct_size, unsigned int port, bool has_port,
>> int (*parse_endpoint)(struct device *dev,
>> struct v4l2_fwnode_endpoint *vep,
>> struct v4l2_async_subdev *asd))
>> @@ -413,10 +413,25 @@ int v4l2_async_notifier_parse_fwnode_endpoints(
>> return -EINVAL;
>>
>> for (fwnode = NULL; (fwnode = fwnode_graph_get_next_endpoint(
>> - dev_fwnode(dev), fwnode)); )
>> - if (fwnode_device_is_available(
>> + dev_fwnode(dev), fwnode)); ) {
>> + if (!fwnode_device_is_available(
>> fwnode_graph_get_port_parent(fwnode)))
>> - max_subdevs++;
>> + continue;
>> +
>> + if (has_port) {
>> + struct fwnode_endpoint ep;
>> +
>> + ret = fwnode_graph_parse_endpoint(fwnode, &ep);
>> + if (ret) {
>> + fwnode_handle_put(fwnode);
>> + return ret;
>> + }
>> +
>> + if (ep.port != port)
>> + continue;
>> + }
>> + max_subdevs++;
>> + }
>>
>> /* No subdevs to add? Return here. */
>> if (max_subdevs == notifier->max_subdevs)
>> @@ -437,6 +452,17 @@ int v4l2_async_notifier_parse_fwnode_endpoints(
>> break;
>> }
>>
>> + if (has_port) {
>> + struct fwnode_endpoint ep;
>> +
>> + ret = fwnode_graph_parse_endpoint(fwnode, &ep);
>> + if (ret)
>> + break;
>> +
>> + if (ep.port != port)
>> + continue;
>> + }
>> +
>> ret = v4l2_async_notifier_fwnode_parse_endpoint(
>> dev, notifier, fwnode, asd_struct_size, parse_endpoint);
>> if (ret < 0)
>> @@ -447,8 +473,31 @@ int v4l2_async_notifier_parse_fwnode_endpoints(
>>
>> return ret;
>> }
>> +
>> +int v4l2_async_notifier_parse_fwnode_endpoints(
>> + struct device *dev, struct v4l2_async_notifier *notifier,
>> + size_t asd_struct_size,
>> + int (*parse_endpoint)(struct device *dev,
>> + struct v4l2_fwnode_endpoint *vep,
>> + struct v4l2_async_subdev *asd))
>> +{
>> + return __v4l2_async_notifier_parse_fwnode_endpoints(
>> + dev, notifier, asd_struct_size, 0, false, parse_endpoint);
>> +}
>> EXPORT_SYMBOL_GPL(v4l2_async_notifier_parse_fwnode_endpoints);
>>
>> +int v4l2_async_notifier_parse_fwnode_endpoints_by_port(
>> + struct device *dev, struct v4l2_async_notifier *notifier,
>> + size_t asd_struct_size, unsigned int port,
>> + int (*parse_endpoint)(struct device *dev,
>> + struct v4l2_fwnode_endpoint *vep,
>> + struct v4l2_async_subdev *asd))
>> +{
>> + return __v4l2_async_notifier_parse_fwnode_endpoints(
>> + dev, notifier, asd_struct_size, port, true, parse_endpoint);
>> +}
>> +EXPORT_SYMBOL_GPL(v4l2_async_notifier_parse_fwnode_endpoints_by_port);
>> +
>> MODULE_LICENSE("GPL");
>> MODULE_AUTHOR("Sakari Ailus <sakari.ailus@xxxxxxxxxxxxxxx>");
>> MODULE_AUTHOR("Sylwester Nawrocki <s.nawrocki@xxxxxxxxxxx>");
>> diff --git a/include/media/v4l2-fwnode.h b/include/media/v4l2-fwnode.h
>> index 31fb77e470fa..b2eed4f33e6a 100644
>> --- a/include/media/v4l2-fwnode.h
>> +++ b/include/media/v4l2-fwnode.h
>> @@ -257,4 +257,63 @@ int v4l2_async_notifier_parse_fwnode_endpoints(
>> struct v4l2_fwnode_endpoint *vep,
>> struct v4l2_async_subdev *asd));
>>
>> +/**
>> + * v4l2_async_notifier_parse_fwnode_endpoints_by_port - Parse V4L2 fwnode
>> + * endpoints of a port in a
>> + * device node
>> + * @dev: the device the endpoints of which are to be parsed
>> + * @notifier: notifier for @dev
>> + * @asd_struct_size: size of the driver's async sub-device struct, including
>> + * sizeof(struct v4l2_async_subdev). The &struct
>> + * v4l2_async_subdev shall be the first member of
>> + * the driver's async sub-device struct, i.e. both
>> + * begin at the same memory address.
>> + * @port: port number where endpoints are to be parsed
>> + * @parse_endpoint: Driver's callback function called on each V4L2 fwnode
>> + * endpoint. Optional.
>> + * Return: %0 on success
>> + * %-ENOTCONN if the endpoint is to be skipped but this
>> + * should not be considered as an error
>> + * %-EINVAL if the endpoint configuration is invalid
>> + *
>> + * This function is just like @v4l2_async_notifier_parse_fwnode_endpoints with
>> + * the exception that it only parses endpoints in a given port.
>> + *
>> + * Parse the fwnode endpoints of the @dev device on a given @port and populate
>> + * the async sub-devices array of the notifier. The @parse_endpoint callback
>> + * function is called for each endpoint with the corresponding async sub-device
>> + * pointer to let the caller initialize the driver-specific part of the async
>> + * sub-device structure.
>> + *
>> + * The notifier memory shall be zeroed before this function is called on the
>> + * notifier.
>> + *
>> + * This function may not be called on a registered notifier and may be called on
>> + * a notifier only once, per port.
>> + *
>> + * Do not change the notifier's subdevs array, take references to the subdevs
>> + * array itself or change the notifier's num_subdevs field. This is because this
>> + * function allocates and reallocates the subdevs array based on parsing
>> + * endpoints.
>> + *
>> + * The @struct v4l2_fwnode_endpoint passed to the callback function
>> + * @parse_endpoint is released once the function is finished. If there is a need
>> + * to retain that configuration, the user needs to allocate memory for it.
>> + *
>> + * Any notifier populated using this function must be released with a call to
>> + * v4l2_async_notifier_release() after it has been unregistered and the async
>> + * sub-devices are no longer in use, even if the function returned an error.
>> + *
>> + * Return: %0 on success, including when no async sub-devices are found
>> + * %-ENOMEM if memory allocation failed
>> + * %-EINVAL if graph or endpoint parsing failed
>> + * Other error codes as returned by @parse_endpoint
>> + */
>> +int v4l2_async_notifier_parse_fwnode_endpoints_by_port(
>> + struct device *dev, struct v4l2_async_notifier *notifier,
>> + size_t asd_struct_size, unsigned int port,
>> + int (*parse_endpoint)(struct device *dev,
>> + struct v4l2_fwnode_endpoint *vep,
>> + struct v4l2_async_subdev *asd));
>> +
>> #endif /* _V4L2_FWNODE_H */
>>
>
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