Re: [PATCH v5] v4l2-async: Match parent devices

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Hi Sakari,

On 07/12/17 07:41, Sakari Ailus wrote:
> On Wed, Dec 06, 2017 at 02:58:39PM +0000, 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 to also perform a cross reference comparison against the
>> parent fwnodes of each other.
>>
>> 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>
>> Signed-off-by: Sakari Ailus <sakari.ailus@xxxxxxxxxxxxxxx>
>>
>> ---
>>
>> Hi Sakari,
>>
>> Since you signed-off on this patch - it has had to be reworked due to the
>> changes on the of_node_full_name() functionality.
>>
>> I believe it is correct now to *just* do the pointer matching, as that matches
>> the current implementation, and converting to device_nodes will be just as
>> equal as the fwnodes, as they are simply containers.
>>
>> Let me know if you are happy to maintain your SOB on this patch - and if we need
>> to work towards getting this integrated upstream, especially in light of your new
>> endpoint matching work.
> 
> I'd really want to avoid resorting to matching opportunistically --- please
> see my reply to Niklas on "[RFC 1/1] v4l: async: Use endpoint node, not
> device node, for fwnode match".

I agree here ... This patch is a workaround to support non-endpoint matching in
a transitioning world. Moving to full endpoint matching will support complex
devices and simple devices ...

If we can go straight to that - then that's fine too.
--
Kieran



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