linux-kernel - Re: [PATCH v2 2/2] mailbox: apple: Add driver for Apple mailboxes

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Date:   Sat, 16 Oct 2021 19:16:53 +0000
From:   Alyssa Rosenzweig <alyssa@...enzweig.io>
To:     Jassi Brar <jassisinghbrar@...il.com>
Cc:     Sven Peter <sven@...npeter.dev>, Rob Herring <robh+dt@...nel.org>,
        Mark Kettenis <mark.kettenis@...all.nl>,
        Hector Martin <marcan@...can.st>,
        Mohamed Mediouni <mohamed.mediouni@...amail.com>,
        Stan Skowronek <stan@...ellium.com>,
        Devicetree List <devicetree@...r.kernel.org>,
        linux-arm-kernel <linux-arm-kernel@...ts.infradead.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v2 2/2] mailbox: apple: Add driver for Apple mailboxes

> > +struct apple_mbox_msg {
> > +       u64 msg0;
> > +       u32 msg1;
> > +};
> > +
> Aren't msg0/1 the Tx and Rx channels? If so you may want to separate
> them out as such. But of course, I don't know the h/w details so I may
> be wrong.

AIUI -- It's a 96-bit message (msg0 is general purpose, msg1 is used for
dispatch). This goes for both RX and TX.