On Dienstag, 21. Mai 2024 10:58:07 MESZ Krzysztof Kozlowski wrote:
> On 20/05/2024 17:11, Luca Weiss wrote:
> > Hi Krzysztof
> >
> > Ack, sounds good.
> >
> > Maybe also from you, any opinion between these two binding styles?
> >
> > So first using index of mboxes for the numbering, where for the known
> > usages the first element (and sometimes the 3rd - ipc-2) are empty <>.
> >
> > The second variant is using mbox-names to get the correct channel-mbox
> > mapping.
> >
> > - qcom,ipc-1 = <&apcs 8 13>;
> > - qcom,ipc-2 = <&apcs 8 9>;
> > - qcom,ipc-3 = <&apcs 8 19>;
> > + mboxes = <0>, <&apcs 13>, <&apcs 9>, <&apcs 19>;
> >
> > vs.
> >
> > - qcom,ipc-1 = <&apcs 8 13>;
> > - qcom,ipc-2 = <&apcs 8 9>;
> > - qcom,ipc-3 = <&apcs 8 19>;
> > + mboxes = <&apcs 13>, <&apcs 9>, <&apcs 19>;
> > + mbox-names = "ipc-1", "ipc-2", "ipc-3";
>
> Sorry, don't get, ipc-1 is the first mailbox, so why would there be <0>
> in first case?
Actually not, ipc-0 would be permissible by the driver, used for the 0th host
e.g. from:
/* Iterate over all hosts to check whom wants a kick */
for (host = 0; host < smsm->num_hosts; host++) {
hostp = &smsm->hosts[host];
Even though no mailbox is specified in any upstream dts for this 0th host I
didn't want the bindings to restrict that, that's why in the first example
there's an empty element (<0>) for the 0th smsm host
> Anyway, the question is if you need to know that some
> mailbox is missing. But then it is weird to name them "ipc-1" etc.
In either case we'd just query the mbox (either by name or index) and then
see if it's there? Not quite sure I understand the sentence..
Pretty sure either binding would work the same way.
Regards
Luca
>
> Best regards,
> Krzysztof
>
>
