Hi Sakari, Thanks for taking a look On 27/04/17 22:43, Sakari Ailus wrote: > Hi Kieran, > > Could I ask you to rebase your patches on top of my V4L2 fwnode patches > here? > > <URL:https://git.linuxtv.org/sailus/media_tree.git/log/?h=v4l2-acpi> > > It depends on the fwnode graph patches, merged here: > > <URL:https://git.linuxtv.org/sailus/media_tree.git/log/?h=v4l2-acpi-merge> > > I expect the fwnode graph patches in v4.12 so we'll have them in media-tree > master soon. > > (I'm pushing these branches right now, it may take a while until it's really > there.) Sure, I'll merge those into my base. > On Thu, Apr 27, 2017 at 07:26:00PM +0100, Kieran Bingham wrote: >> From: Kieran Bingham <kieran.bingham+renesas@xxxxxxxxxxxxxxxx> >> >> Devices such as the the ADV748x support multiple parallel stream routes >> through a single chip. This leads towards needing to provide multiple >> distinct entities and subdevs from a single device-tree node. >> >> To distinguish these separate outputs, the device-tree binding must >> specify each endpoint link with a unique (to the device) non-zero port >> number. >> >> This number allows async subdev registrations to identify the correct >> subdevice to bind and link. >> >> Signed-off-by: Kieran Bingham <kieran.bingham+renesas@xxxxxxxxxxxxxxxx> >> --- >> drivers/media/v4l2-core/v4l2-async.c | 7 +++++++ >> drivers/media/v4l2-core/v4l2-subdev.c | 1 + >> include/media/v4l2-async.h | 1 + >> include/media/v4l2-subdev.h | 2 ++ >> 4 files changed, 11 insertions(+) >> >> diff --git a/drivers/media/v4l2-core/v4l2-async.c b/drivers/media/v4l2-core/v4l2-async.c >> index 1815e54e8a38..875e6ce646ec 100644 >> --- a/drivers/media/v4l2-core/v4l2-async.c >> +++ b/drivers/media/v4l2-core/v4l2-async.c >> @@ -42,6 +42,13 @@ static bool match_devname(struct v4l2_subdev *sd, >> >> static bool match_of(struct v4l2_subdev *sd, struct v4l2_async_subdev *asd) >> { >> + /* >> + * If set, we must match the device tree port, with the subdev port. >> + * This is a fast match, so do this first >> + */ >> + if (sd->port && sd->port != asd->match.of.port) > > Zero is an entirely valid value for a port. I think it'd be good not to > depend on non-zero port values for port matching. Well then that pretty much dashes my chances on not parsing the DT in the ADV driver. >> + return -1; > > Any particular reason to return -1 from a function with bool return type? Ahem, I clearly can't read ;-) I think my mindset was thinking strcmp or something... >> + >> return !of_node_cmp(of_node_full_name(sd->of_node), >> of_node_full_name(asd->match.of.node)); >> } >> diff --git a/drivers/media/v4l2-core/v4l2-subdev.c b/drivers/media/v4l2-core/v4l2-subdev.c >> index da78497ae5ed..67f816f90ac3 100644 >> --- a/drivers/media/v4l2-core/v4l2-subdev.c >> +++ b/drivers/media/v4l2-core/v4l2-subdev.c >> @@ -607,6 +607,7 @@ void v4l2_subdev_init(struct v4l2_subdev *sd, const struct v4l2_subdev_ops *ops) >> sd->flags = 0; >> sd->name[0] = '\0'; >> sd->grp_id = 0; >> + sd->port = 0; >> sd->dev_priv = NULL; >> sd->host_priv = NULL; >> #if defined(CONFIG_MEDIA_CONTROLLER) >> diff --git a/include/media/v4l2-async.h b/include/media/v4l2-async.h >> index 5b501309b6a7..2988960613ec 100644 >> --- a/include/media/v4l2-async.h >> +++ b/include/media/v4l2-async.h >> @@ -56,6 +56,7 @@ struct v4l2_async_subdev { >> union { >> struct { >> const struct device_node *node; >> + u32 port; > > What if instead of storing the device's OF node, you'd store the port node > and used that for matching? > > Would that also solve the problem or do I miss something? Actually - I was 'trying' to prevent having to parse the DT in the adv748x driver if I didn't need to. Once I have to parse the DT, then yes, I think storing the endpoint node is probably the best thing to compare against. And actually - you might have just solved my open question in the cover letter ... I had got stuck in my mindset that if I were to use the endpoint 'leaf' node as a comparator - that it would be 'instead' of the root node. But actually - it could just be root-node + leaf-node to compare, which then allows us the fallback of comparing just the root nodes if the leaf isn't set. I'll respin with this either tomorrow or early next week. > >> } of; >> struct { >> const char *name; >> diff --git a/include/media/v4l2-subdev.h b/include/media/v4l2-subdev.h >> index 0ab1c5df6fac..1c1731b491e5 100644 >> --- a/include/media/v4l2-subdev.h >> +++ b/include/media/v4l2-subdev.h >> @@ -782,6 +782,7 @@ struct v4l2_subdev_platform_data { >> * @ctrl_handler: The control handler of this subdev. May be NULL. >> * @name: Name of the sub-device. Please notice that the name must be unique. >> * @grp_id: can be used to group similar subdevs. Value is driver-specific >> + * @port: driver-specific value to bind multiple subdevs with a single DT node. >> * @dev_priv: pointer to private data >> * @host_priv: pointer to private data used by the device where the subdev >> * is attached. >> @@ -814,6 +815,7 @@ struct v4l2_subdev { >> struct v4l2_ctrl_handler *ctrl_handler; >> char name[V4L2_SUBDEV_NAME_SIZE]; >> u32 grp_id; >> + u32 port; >> void *dev_priv; >> void *host_priv; >> struct video_device *devnode; > Regards Kieran
