Reviewing my own post:
On 19/05/17 17:16, Kieran Bingham wrote:
> From: Kieran Bingham <kieran.bingham+renesas@xxxxxxxxxxxxxxxx>
>
> Devices supporting multiple endpoints on a single device node must set
> their subdevice fwnode to the endpoint to allow distinct comparisons.
>
> Adapt the match_fwnode call to compare against the provided fwnodes
> first, but also to search for a comparison against the parent fwnode.
>
> This allows notifiers to pass the endpoint for comparison and still
> support existing subdevices which store their default parent device
> node.
>
> Signed-off-by: Kieran Bingham <kieran.bingham+renesas@xxxxxxxxxxxxxxxx>
>
> ---
> v2:
> - Added documentation comments
> - simplified the OF match by adding match_fwnode_of()
>
> drivers/media/v4l2-core/v4l2-async.c | 33 ++++++++++++++++++++++++-----
> 1 file changed, 28 insertions(+), 5 deletions(-)
>
> diff --git a/drivers/media/v4l2-core/v4l2-async.c b/drivers/media/v4l2-core/v4l2-async.c
> index cbd919d4edd2..2473c0a1f7a8 100644
> --- a/drivers/media/v4l2-core/v4l2-async.c
> +++ b/drivers/media/v4l2-core/v4l2-async.c
> @@ -41,14 +41,37 @@ static bool match_devname(struct v4l2_subdev *sd,
> return !strcmp(asd->match.device_name.name, dev_name(sd->dev));
> }
>
> +static bool match_fwnode_of(struct fwnode_handle *a, struct fwnode_handle *b)
> +{
> + return !of_node_cmp(of_node_full_name(to_of_node(a)),
> + of_node_full_name(to_of_node(b)));
> +}
> +
> +/*
> + * Compare the sd with the notifier.
> + *
> + * As a measure to support drivers which have not been converted to use
> + * endpoint matching, we also find the parent device of the node in the
> + * notifier, and compare the sd against that device.
> + */
> static bool match_fwnode(struct v4l2_subdev *sd, struct v4l2_async_subdev *asd)
> {
> - if (!is_of_node(sd->fwnode) || !is_of_node(asd->match.fwnode.fwnode))
> - return sd->fwnode == asd->match.fwnode.fwnode;
> + struct fwnode_handle *asd_fwnode = asd->match.fwnode.fwnode;
> + struct fwnode_handle *sd_parent, *asd_parent;
> +
The keen eyed will notice that sd_parent is not initialised here before use:
Fixed in the next version, pending testing and repost.
> + asd_parent = fwnode_graph_get_port_parent(asd_fwnode);
> +
> + if (!is_of_node(sd->fwnode) || !is_of_node(asd_fwnode))
> + return sd->fwnode == asd_fwnode ||
> + sd_parent == asd_fwnode ||
> + sd->fwnode == asd_parent;
>
> - return !of_node_cmp(of_node_full_name(to_of_node(sd->fwnode)),
> - of_node_full_name(
> - to_of_node(asd->match.fwnode.fwnode)));
> + /*
> + * Compare OF nodes with a full match to support removable dt snippets.
> + */
> + return match_fwnode_of(sd->fwnode, asd_fwnode) ||
> + match_fwnode_of(sd_parent, asd_fwnode) ||
> + match_fwnode_of(sd->fwnode, asd_parent);
> }
>
> static bool match_custom(struct v4l2_subdev *sd, struct v4l2_async_subdev *asd)
>
