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

[Jassi Brar]

On Wed, Feb 28, 2018 at 11:21 PM, Samuel Holland <samuel@xxxxxxxxxxxx> wrote:
> Hi,
>
> On 02/28/18 03:16, Jassi Brar wrote:
>> On Wed, Feb 28, 2018 at 7:57 AM, Samuel Holland <samuel@xxxxxxxxxxxx> 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