linux-kernel - Re: [PATCH V9 2/2] mailbox: introduce ARM SMC based mailbox

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Message-ID: <9dff720e-2e81-a7b8-ff52-1f2c3d257368@gmail.com>
Date:   Thu, 26 Sep 2019 19:39:26 -0700
From:   Florian Fainelli <f.fainelli@...il.com>
To:     Peng Fan <peng.fan@....com>,
        "robh+dt@...nel.org" <robh+dt@...nel.org>,
        "mark.rutland@....com" <mark.rutland@....com>,
        "jassisinghbrar@...il.com" <jassisinghbrar@...il.com>,
        "sudeep.holla@....com" <sudeep.holla@....com>,
        "andre.przywara@....com" <andre.przywara@....com>
Cc:     "devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>,
        dl-linux-imx <linux-imx@....com>
Subject: Re: [PATCH V9 2/2] mailbox: introduce ARM SMC based mailbox



On 9/24/2019 7:09 PM, Peng Fan wrote:
> From: Peng Fan <peng.fan@....com>
> 
> This mailbox driver implements a mailbox which signals transmitted data
> via an ARM smc (secure monitor call) instruction. The mailbox receiver
> is implemented in firmware and can synchronously return data when it
> returns execution to the non-secure world again.
> An asynchronous receive path is not implemented.
> This allows the usage of a mailbox to trigger firmware actions on SoCs
> which either don't have a separate management processor or on which such
> a core is not available. A user of this mailbox could be the SCP
> interface.
> 
> Modified from Andre Przywara's v2 patch
> https://lore.kernel.org/patchwork/patch/812999/
> 
> Cc: Andre Przywara <andre.przywara@....com>
> Signed-off-by: Peng Fan <peng.fan@....com>

Reviewed-by: Florian Fainelli <f.fainelli@...il.com>

Thanks for your persistence working on this!
-- 
Florian