Re: signaling txdone for synchronos mailboxes

[Jassi Brar]

On Wed, Aug 19, 2026 at 5:00 AM Uwe Kleine-König
<u.kleine-koenig@xxxxxxxxxxxx> wrote:
>
> Hello,
>
> I'm working on porting a mailbox/remoteproc driver from a vendor tree[1]
> to mainline. One thing that is unclear to me is how txdone should be
> signalled on that hardware. On that platform there is no feedback on
> how/when the remote side saw/processed the message and the local side is
> immediately ready to send the next signal.
>
This is basically a "Doorbell" controller.  grep doorbell in
drivers/mailbox/ to pick a driver for reference.

Regards,
Jassi