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x-originating-ip: [119.31.174.71] x-ms-publictraffictype: Email x-ms-office365-filtering-ht: Tenant x-ms-office365-filtering-correlation-id: b2301265-8985-4e5d-68a5-08d779329af0 x-ms-traffictypediagnostic: AM0PR04MB6163:|AM0PR04MB6163: x-ms-exchange-transport-forked: True x-microsoft-antispam-prvs: x-ms-oob-tlc-oobclassifiers: OLM:9508; x-forefront-prvs: 02426D11FE x-forefront-antispam-report: SFV:NSPM;SFS:(10009020)(4636009)(39860400002)(376002)(136003)(346002)(366004)(396003)(78114003)(199004)(189003)(5660300002)(229853002)(3846002)(6436002)(6116002)(554214002)(2906002)(6246003)(6306002)(9686003)(186003)(99286004)(44832011)(7696005)(316002)(14454004)(76176011)(11346002)(54906003)(6506007)(102836004)(8676002)(81166006)(81156014)(55016002)(86362001)(26005)(8936002)(74316002)(64756008)(305945005)(7736002)(15650500001)(6916009)(4326008)(966005)(45080400002)(25786009)(478600001)(7416002)(66476007)(66556008)(66446008)(33656002)(52536014)(71200400001)(66946007)(71190400001)(76116006);DIR:OUT;SFP:1101;SCL:1;SRVR:AM0PR04MB6163;H:AM0PR04MB4481.eurprd04.prod.outlook.com;FPR:;SPF:None;LANG:en;PTR:InfoNoRecords;A:1;MX:1; received-spf: None (protection.outlook.com: nxp.com does not designate permitted sender hosts) x-ms-exchange-senderadcheck: 1 x-microsoft-antispam: BCL:0; x-microsoft-antispam-message-info: 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 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 X-OriginatorOrg: nxp.com X-MS-Exchange-CrossTenant-Network-Message-Id: b2301265-8985-4e5d-68a5-08d779329af0 X-MS-Exchange-CrossTenant-originalarrivaltime: 05 Dec 2019 03:24:14.9477 (UTC) X-MS-Exchange-CrossTenant-fromentityheader: Hosted X-MS-Exchange-CrossTenant-id: 686ea1d3-bc2b-4c6f-a92c-d99c5c301635 X-MS-Exchange-CrossTenant-mailboxtype: HOSTED X-MS-Exchange-CrossTenant-userprincipalname: /Q0+BW6Ipl2pKjFVS2HymgJl00Ny5awh7o8+pIcQLha2wbkAX/eLqzWUA07GGtksinxeGWKkpW6ACVDBKmBpvQ== X-MS-Exchange-Transport-CrossTenantHeadersStamped: AM0PR04MB6163 Sender: devicetree-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: devicetree@vger.kernel.org > Subject: Re: [PATCH v11 2/2] mailbox: introduce ARM SMC based mailbox >=20 > (+Viresh,Arnd) >=20 > On Mon, Dec 02, 2019 at 10:14:43AM +0000, 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. > > >=20 > I would like to know all the use-cases for this driver ?=20 Currently my usecase is SCMI. Is this only for SCMI or > will this get used with other protocols on the top. I assume the latter a= nd > hence it is preferred to keep this as a mailbox driver. >=20 > I am not against this approach but the reason I ask is to avoid duplicati= on. > Viresh has suggested abstraction of transport from SCMI driver to enable > other transports[1]. Couple of transports that I am aware of is this SMC/= HVC > and the new(still in-concept) SPCI. >=20 > So I am looking for opinions on that approach. Please feel free to commen= t > here or as part of that patch. If we want to use SMC as transports, smc mailbox or smc transports(non-mail= box) could be used. Both ok for me, smc transports just need write a new driver under scmi folder. I left the decision to you(scmi maintainer) and Jassi(mailbox maintainer), Just hope the smc/hvc used as transports could be landed in upstream soon. Thanks, Peng. >=20 > -- > Regards, > Sudeep >=20 > [1] > https://eur01.safelinks.protection.outlook.com/?url=3Dhttps%3A%2F%2Flore.= ke > rnel.org%2Flkml%2F5c545c2866ba075ddb44907940a1dae1d823b8a1.15750 > 19719.git.viresh.kumar%40linaro.org&data=3D02%7C01%7Cpeng.fan%40n > xp.com%7C06edb0c37371419db3cd08d777e66780%7C686ea1d3bc2b4c6fa9 > 2cd99c5c301635%7C0%7C1%7C637109703766574454&sdata=3DnInLSUu > mwzBvl%2FcmckQkpZbJT4JAtVkzr1TSWkmz6qo%3D&reserved=3D0