Re: [PATCH 2/2] arm64: dts: zena: Add support for Zena CSS

+Cristian(in case I am talking no sense)

On Fri, Jan 30, 2026 at 11:31:25AM +0100, Andre Przywara wrote:

So do you need just one "tx", but "rx" plus "rx_reply"? Which isn't valid in
the current binding?
If that's the case, then we would need a patch to relax the binding and
allowing this combination as well.
Looking into the kernel code it looks like the SCMI driver doesn't use
mbox-names, but explicitly expects assignments depending on the number of
mboxes? Somewhat confusing ...

It is generally transmitted via tx, and tx_reply is necessary when the
platform has unidirectional channels. tx_reply is used to determine when the
synchronization commands have completed, without requiring polling of the
shared memory. rx_reply is necessary only if the platform firmware expects
it and doesn't poll the shared memory for OSPM/agent acknowledgement.

-- 
Regards,
Sudeep