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charset="iso-8859-1" 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: 758b47bf-c0c8-4c2c-4708-08d9f55f5688 X-MS-Exchange-CrossTenant-originalarrivaltime: 21 Feb 2022 17:26:47.1012 (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: W23u9Ztle4eTtX15Y8hsFRG3YAMn1x1rj3SR8V1/GMhPcE2ctCsUkrtzuu77KjPqH6s0njRuW9fFwFiuLxLDwP6vI2YSHekokbo7USnkL+4= X-MS-Exchange-Transport-CrossTenantHeadersStamped: AM7PR03MB6466 X-Proofpoint-GUID: XPMz66BUP8AURLUM0XKuijYvtB6vqgBZ X-Proofpoint-ORIG-GUID: XPMz66BUP8AURLUM0XKuijYvtB6vqgBZ X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.205,Aquarius:18.0.816,Hydra:6.0.425,FMLib:17.11.62.513 definitions=2022-02-21_08,2022-02-21_02,2021-12-02_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 priorityscore=1501 bulkscore=0 phishscore=0 lowpriorityscore=0 spamscore=0 suspectscore=0 mlxlogscore=509 impostorscore=0 adultscore=0 malwarescore=0 clxscore=1011 mlxscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2201110000 definitions=main-2202210102 Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org 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. Given parameter should set the device_id, needed to set device permissions in the Firmware. This feature will be extremely useful for the virtualized systems, which has more that one Guests running on the system at the same time or for the syestems, which require several agents with different permissions. Trusted agent will use scmi_devid to set the Device permissions for the Firmware (See Section 4.2.2.10 [0] for details). Agents concept is described in Section 4.2.1 [0]. scmi_devid in Device-tree node example: usb@e6590000 { scmi_devid =3D <19>; clocks =3D <&scmi_clock 3>, <&scmi_clock 2>; resets =3D <&scmi_reset 10>, <&scmi_reset 9>; power-domains =3D <&scmi_power 0>; }; Given example shows the configuration of the hsusb node, which is using scmi to contol clocks, resets and power-domains. scmi_devid is set equals to 19, which should match defined id for usb in the Firmware. Trusted agent will use scmi_devid to set the device permissions for the Agents. Guest OS should not have an access to the permissions settings, so no code to process scmi_devid was presented in Linux kernel. We are currently contributing changes to Xen, which are intended to mediate SCMI access from Guests to the Firmware. Xen uses scmi_devid to set the permissions for the devices. See [1] thread for details. [0] https://developer.arm.com/documentation/den0056/latest [1] https://xen.markmail.org/message/mmi4fpb4qr6e3kad --- Posting this patch as RFC because I'm not sure if I set maintainers correctly. Hope community will help me so I could set the maintainers in v2. Oleksii Moisieiev (1): dt-bindings: arm: Add scmi_devid property description for SCMI .../bindings/firmware/arm,scmi-devid.yaml | 41 +++++++++++++++++++ 1 file changed, 41 insertions(+) create mode 100644 Documentation/devicetree/bindings/firmware/arm,scmi-dev= id.yaml --=20 2.27.0