linux-kernel - Re: [PATCH v4 2/2] mailbox: sprd: Add Spreadtrum mailbox driver

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Message-ID: <CABb+yY2Pph4EeQtg9xSaCWHqcXr0mVNkrrFYm-E3x3f5xaxygg@mail.gmail.com>
Date:   Wed, 6 May 2020 18:25:38 -0500
From:   Jassi Brar <jassisinghbrar@...il.com>
To:     Baolin Wang <baolin.wang7@...il.com>
Cc:     Rob Herring <robh+dt@...nel.org>, Orson Zhai <orsonzhai@...il.com>,
        Chunyan Zhang <zhang.lyra@...il.com>,
        Devicetree List <devicetree@...r.kernel.org>,
        LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v4 2/2] mailbox: sprd: Add Spreadtrum mailbox driver

On Wed, May 6, 2020 at 8:29 AM Baolin Wang <baolin.wang7@...il.com> wrote:
>
> Hi Jassi,
>
> On Tue, Apr 28, 2020 at 11:10 AM Baolin Wang <baolin.wang7@...il.com> wrote:
> >
> > From: Baolin Wang <baolin.wang@...soc.com>
> >
> > The Spreadtrum mailbox controller supports 8 channels to communicate
> > with MCUs, and it contains 2 different parts: inbox and outbox, which
> > are used to send and receive messages by IRQ mode.
> >
> > Signed-off-by: Baolin Wang <baolin.wang@...soc.com>
> > Signed-off-by: Baolin Wang <baolin.wang7@...il.com>
> > ---
> > Changes from v3:
> >  - Save the id in mbox_chan.con_priv and remove the 'sprd_mbox_chan'
> >
> > Changes from v2:
> >  - None.
> >
> > Changes from v1:
> >  - None
>
> Gentle ping, do you have any other comments? Thanks.
>
Yea, I am still not sure about the error returned in send_data().  It
will either never hit or there will be no easy recovery from it. The
api expects the driver to tell it the last-tx was done only when it
can send the next message. (There may be case like sending depend on
remote, which can't be ensured before hand).

thnx