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Tue, 1 Mar 2022 16:10:34 +0000 From: Oleksii Moisieiev To: Stefano Stabellini CC: Sudeep Holla , Cristian Marussi , "robh+dt@kernel.org" , "devicetree@vger.kernel.org" , Vincent Guittot , Souvik Chakravarty , "linux-kernel@vger.kernel.org" Subject: Re: [RFC PATCH 0/1] dt-bindings: arm: Add scmi_devid paramter for Thread-Topic: [RFC PATCH 0/1] dt-bindings: arm: Add scmi_devid paramter for Thread-Index: AQHYJ0gzI98NnKSQaEaZikv/1tAERayfaB6AgABVqICAABNVgIACyvOAgAC3jwCAB2uVAA== Date: Tue, 1 Mar 2022 16:10:34 +0000 Message-ID: <20220301161034.GA78066@EPUAKYIW015D> References: <20220222110003.GC21915@e120937-lin> <20220222160637.yn6pru4nfgwih23j@bogus> <20220222171549.GA2194063@EPUAKYIW015D> <20220224115443.fwhczfvm3cfwoim7@bogus> In-Reply-To: Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: x-ms-publictraffictype: Email x-ms-office365-filtering-correlation-id: 042bb5a1-003c-45d4-2b85-08d9fb9e0487 x-ms-traffictypediagnostic: VI1PR03MB4256:EE_ x-microsoft-antispam-prvs: x-ms-exchange-senderadcheck: 1 x-ms-exchange-antispam-relay: 0 x-microsoft-antispam: BCL:0; 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charset="us-ascii" Content-ID: <424EF99A9B8AA04B91771A3356958C75@eurprd03.prod.outlook.com> Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 X-OriginatorOrg: epam.com X-MS-Exchange-CrossTenant-AuthAs: Internal X-MS-Exchange-CrossTenant-AuthSource: PA4PR03MB7136.eurprd03.prod.outlook.com X-MS-Exchange-CrossTenant-Network-Message-Id: 042bb5a1-003c-45d4-2b85-08d9fb9e0487 X-MS-Exchange-CrossTenant-originalarrivaltime: 01 Mar 2022 16:10:34.8070 (UTC) X-MS-Exchange-CrossTenant-fromentityheader: Hosted X-MS-Exchange-CrossTenant-id: b41b72d0-4e9f-4c26-8a69-f949f367c91d X-MS-Exchange-CrossTenant-mailboxtype: HOSTED X-MS-Exchange-CrossTenant-userprincipalname: aM+g1MD6KbyB7aUxitJVZYvC3rnoDCKsJcVxDQT1EP82U4fuTbwjbe5BqyuFWntieJd/zcG4P/JbxsNj3f1QQKOkgqvOjY62TGEoyI401xI= X-MS-Exchange-Transport-CrossTenantHeadersStamped: VI1PR03MB4256 X-Proofpoint-GUID: zbueCTtkv7wctb0BZcnm-yJfypE3pQve X-Proofpoint-ORIG-GUID: zbueCTtkv7wctb0BZcnm-yJfypE3pQve X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.205,Aquarius:18.0.816,Hydra:6.0.425,FMLib:17.11.64.514 definitions=2022-03-01_07,2022-02-26_01,2022-02-23_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 adultscore=0 priorityscore=1501 mlxscore=0 malwarescore=0 spamscore=0 bulkscore=0 phishscore=0 clxscore=1015 suspectscore=0 impostorscore=0 mlxlogscore=999 lowpriorityscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2201110000 definitions=main-2203010086 Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Hi Stefano, On Thu, Feb 24, 2022 at 02:51:42PM -0800, Stefano Stabellini wrote: > On Thu, 24 Feb 2022, Sudeep Holla wrote: > > On Tue, Feb 22, 2022 at 05:15:49PM +0000, Oleksii Moisieiev wrote: > > > Hi Sudeep, > > >=20 > > > On Tue, Feb 22, 2022 at 04:06:37PM +0000, Sudeep Holla wrote: > > > > Hi Oleksii, > > > >=20 > > > > My initial feedback on this. And thanks Cristian for making it so e= asy as > > > > you have covered most of the things in depth(which I might have not= done > > > > myself that well) > > > >=20 > > > > On Tue, Feb 22, 2022 at 11:00:03AM +0000, Cristian Marussi wrote: > > > > > On Mon, Feb 21, 2022 at 05:26:46PM +0000, Oleksii Moisieiev wrote= : > > > > > > Introducing new parameter called scmi_devid to the device-tree = bindings. > > > > > > This parameter should be set for the device nodes, which has > > > > > > clocks/power-domains/resets working through SCMI. > > > >=20 > > > > I prefer you had given more details on your usage model here instea= d of > > > > pointing to the other Xen thread as it helps for someone without mu= ch > > > > background on Xen or your use-case to review this. > > > >=20 > > > Let me describe the process in few words: > > > We implemented a new feature, called SCI-mediator in Xen. > > > The proposed implementation allows Guests to communicate with the Fir= mware using SCMI > > > protocol with SMC as a transport. Other implementation are also > > > possible, such as SCMI-Mailbox, SCPI-mailbox etc. > > >=20 > > > In this feature Xen is the Trusted Agent, which receives the followin= g > > > information in Xen device-tree: > > > 1) All channels should be described, each channel defined as > > > arm,scmi-shmem node; > > > 2) Scmi node arm,scmi-smc with protocols description; > >=20 > > Sounds good so far. > >=20 > > > 3) scmi-devid should be set in nodes, which works through SCMI. > > > > >=20 > > Why is this needed for Guest OS, you need not populate this if Guest OS > > is not required to use it, right ? If it is needed just by Xen hypervis= or, > > lets talk about that and why it is bad idea to mix that with general > > SCMI bindings. >=20 > I'll try to help Oleksii by answering here, I hope I am not off the mark > :-) I appreciate it. >=20 > I think Sudeep is right, scmi-devid is not needed by the guest OS. >=20 I agree. I think this should be handled by Xen. Best regards, Oleksii.=