From mboxrd@z Thu Jan 1 00:00:00 1970 From: Florian Fainelli Subject: Re: [PATCH V9 2/2] mailbox: introduce ARM SMC based mailbox Date: Thu, 26 Sep 2019 19:39:26 -0700 Message-ID: <9dff720e-2e81-a7b8-ff52-1f2c3d257368@gmail.com> References: <1569377224-5755-1-git-send-email-peng.fan@nxp.com> <1569377224-5755-3-git-send-email-peng.fan@nxp.com> Mime-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: 7bit Return-path: In-Reply-To: <1569377224-5755-3-git-send-email-peng.fan@nxp.com> Content-Language: en-US Sender: linux-kernel-owner@vger.kernel.org To: Peng Fan , "robh+dt@kernel.org" , "mark.rutland@arm.com" , "jassisinghbrar@gmail.com" , "sudeep.holla@arm.com" , "andre.przywara@arm.com" Cc: "devicetree@vger.kernel.org" , "linux-kernel@vger.kernel.org" , "linux-arm-kernel@lists.infradead.org" , dl-linux-imx List-Id: devicetree@vger.kernel.org On 9/24/2019 7:09 PM, Peng Fan wrote: > From: Peng Fan > > 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 > Signed-off-by: Peng Fan Reviewed-by: Florian Fainelli Thanks for your persistence working on this! -- Florian