linux-kernel - Re: [PATCH 1/8] mailbox: introduce ARM SMC based mailbox

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Date:   Mon, 24 Jul 2017 23:22:41 +0530
From:   Jassi Brar <jassisinghbrar@...il.com>
To:     Sudeep Holla <sudeep.holla@....com>
Cc:     André Przywara <andre.przywara@....com>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        linux-sunxi@...glegroups.com,
        Maxime Ripard <maxime.ripard@...e-electrons.com>,
        Chen-Yu Tsai <wens@...e.org>, Icenowy Zheng <icenowy@...c.xyz>,
        Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Devicetree List <devicetree@...r.kernel.org>
Subject: Re: [PATCH 1/8] mailbox: introduce ARM SMC based mailbox

On Mon, Jul 24, 2017 at 11:08 PM, Sudeep Holla <sudeep.holla@....com> wrote:
> On 24/07/17 18:20, Jassi Brar wrote:

>>
>>> I see that the SCPI firmware driver (as the user of the mailbox API) is
>>> expecting the return value from a0 as returned above, translating the
>>> firmware error codes into Linux' ones.
>>>
>> I am afraid, SCPI driver is not the golden example for client drivers
>> to follow. It is supposed to work only with MHU, and then, it is
>> likely to break if some other protocol is running parallel to it.
>>
>
> Not sure why do you say it works only with ARM MHU ? AmLogic uses it
> with their mailbox driver. However they followed an interim version of
> the SCPI spec which is termed "legacy" in the driver.
>
Screw coding... Just tell me what stuff do you smoke? Must be really good!