linux-kernel - Re: [RFC] dt-bindings: mailbox: add doorbell support to ARM MHU

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Message-ID: <CABb+yY2KXqRnxqHC-Hs8NsosEPtyTYO4v_b1cCGs9Lphpz_X+A@mail.gmail.com>
Date:   Wed, 3 Jun 2020 13:42:18 -0500
From:   Jassi Brar <jassisinghbrar@...il.com>
To:     Sudeep Holla <sudeep.holla@....com>
Cc:     Viresh Kumar <viresh.kumar@...aro.org>,
        Bjorn Andersson <bjorn.andersson@...aro.org>,
        Arnd Bergmann <arnd@...db.de>,
        Rob Herring <robh+dt@...nel.org>,
        Frank Rowand <frowand.list@...il.com>,
        Vincent Guittot <vincent.guittot@...aro.org>,
        linux-arm-kernel <linux-arm-kernel@...ts.infradead.org>,
        Devicetree List <devicetree@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [RFC] dt-bindings: mailbox: add doorbell support to ARM MHU

On Wed, Jun 3, 2020 at 1:31 PM Sudeep Holla <sudeep.holla@....com> wrote:
>
> > >
> > H/W is actually fine :)   Its just that the driver is written to
> > _also_ support a platform (my original) that doesn't have shmem and
> > need to pass data via 32bit registers.
> > Frankly, I am not against the doorbell mode, I am against implementing
> > two modes in a driver. If it really helped (note the past tense) the
> > SCMI, we could implement the driver only in doorbell mode but
> > unfortunately SCMI would still be _broken_ for non-doorbell
> > controllers.
>
> Should be fine as the specification is designed to work with only shmem
> for any data transfer and mailbox is just a signal mechanism. I won't
> be too worried about that.
>
Please clarify how it will work on, say again, rockchip platform with shmem.

thanks.