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    SubjectRE: [PATCH v5 1/2] dt-bindings: mailbox: add binding doc for the ARM SMC/HVC mailbox
    Date
    Hi Sudeep

    > Subject: Re: [PATCH v5 1/2] dt-bindings: mailbox: add binding doc for the ARM
    > SMC/HVC mailbox
    >
    > On Fri, Aug 30, 2019 at 07:37:41AM +0000, Peng Fan wrote:
    > > Hi Jassi,
    > > > > I think there could be channel for TEE, and channel for Linux.
    > > > > For virtualization case, there could be dedicated channel for each VM.
    > > > >
    > > > I am talking from Linux pov. Functions 0xfe and 0xff above, can't
    > > > both be active at the same time, right?
    > >
    > > If I get your point correctly,
    > > On UP, both could not be active. On SMP, tx/rx could be both active,
    > > anyway this depends on secure firmware and Linux firmware design.
    > >
    >
    > Just to confirm, we can't have SMC/HVC based Rx channel as there's no
    > *architectural* way to achieve it. So it can be based on some interrupt from
    > secure side and hence will be a *different* type of channel/controller.
    >
    > Sorry to make this point repeatedly, but juts to be absolutely clear:
    > as it stands, SMC/HVC can be used only for Tx today.

    Since interrupt notification was dropped in v5, I need to drop RX description
    in v6.

    Thanks,
    Peng.

    >
    > --
    > Regards,
    > Sudeep

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