On 04/09/2025 09:26, Hans de Goede wrote:

quoted

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+maintainers:
+  - Aleksandrs Vinarskis [off-list ref]
+
+description:
+  Some LED defined in DT are required by other DT consumers, for example
+  v4l2 subnode may require privacy or flash LED.
+
+  Document LED properties that its consumers may define.

We already have the trigger-source binding for "attaching" LEDs to 
devices. Why does that not work here?

I have not actually considered this, as the existing privacy-led solution
from the original series is not trigger based. At least one of the reasons
for that is that trigger source can be rather easily altered from user
space, which would've been bad for this use case. If v4l2 acquires control
over the LED it actually removes triggers and disables sysfs on that LED.

So does that mean that v4l2 solves the problem of "trigger source can be
rather easily altered from user space"?

Yes, currently the v4l2-core already does:

Thanks, I understand that it solves the problem described in the patch,
so the patch can be dropped.


Best regards,
Krzysztof