linux-kernel - Re: [PATCH 3/3] mailbox: sunxi-msgbox: Add a new mailbox driver

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Date:   Wed, 28 Feb 2018 23:44:18 +0530
From:   Jassi Brar <jassisinghbrar@...il.com>
To:     Samuel Holland <samuel@...lland.org>
Cc:     Maxime Ripard <maxime.ripard@...e-electrons.com>,
        Chen-Yu Tsai <wens@...e.org>, Rob Herring <robh+dt@...nel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        <", linux-arm-kernel"@lists.infradead.org>,
        ", linux-arm-kernel@...ts.infradead.org,
        linux-mediatek@...ts.infradead.org, srv_heupstream" 
        <linux-mediatek@...ts.infradead.org>,
        srv_heupstream <linux-arm-kernel@...ts.infradead.org>,
        Devicetree List <devicetree@...r.kernel.org>,
        Andre Przywara <andre.przywara@....com>
Subject: Re: [PATCH 3/3] mailbox: sunxi-msgbox: Add a new mailbox driver

On Wed, Feb 28, 2018 at 11:21 PM, Samuel Holland <samuel@...lland.org> wrote:
> Hi,
>
> On 02/28/18 03:16, Jassi Brar wrote:
>> On Wed, Feb 28, 2018 at 7:57 AM, Samuel Holland <samuel@...lland.org> wrote:
>> ....
>>
>>> +/*
>>> + * The message box hardware provides 8 unidirectional channels. As the mailbox
>>> + * framework expects them to be bidirectional
>>>
>> That is incorrect. Mailbox framework does not require a channel to be
>> TX and RX capable.
>
> Sorry, it would be more accurate to say that the intended mailbox _client_
> expects the channels to be bidirectional.
>
Mailbox clients are very mailbox provider specific. Your client driver
is unlikely to be reuseable over another controller+remote combo.
Your client has to know already what a physical channel can do (RX, TX
or RXTX). There is no api to provide that info.

thanks