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

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Message-ID: <20200518073514.tjodf6qxg3wjzyb4@vireshk-i7>
Date:   Mon, 18 May 2020 13:05:14 +0530
From:   Viresh Kumar <viresh.kumar@...aro.org>
To:     Jassi Brar <jassisinghbrar@...il.com>
Cc:     Arnd Bergmann <arnd@...db.de>, Rob Herring <robh+dt@...nel.org>,
        Frank Rowand <frowand.list@...il.com>,
        Bjorn Andersson <bjorn.andersson@...aro.org>,
        Vincent Guittot <vincent.guittot@...aro.org>,
        linux-arm-kernel <linux-arm-kernel@...ts.infradead.org>,
        Sudeep Holla <sudeep.holla@....com>,
        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 15-05-20, 11:46, Jassi Brar wrote:
> As I asked you yesterday over the call, it may help if you could share
> some numbers to back up the doomsday scenario.

Yes, I have already asked Sudeep to get some numbers for this. He will
get back to us.

> > - With the current approach it isn't possible to assign different bits
> >   (or doorbell numbers) to clients from DT and the only way of doing
> >   that without adding new bindings is by extending #mbox-cells to accept
> >   a value of 2 as done in this patch.
> >
> I am afraid you are confused. You can use bit/doorbell-6 by passing
> 0x40 to mhu as the data to send.

That's how the code will do it, right I agree. What I was asking was
the way this information is passed from DT.

-- 
viresh