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Thu, 19 Mar 2026 10:45:53 -0700 Received: from BUILDSERVER-IO-L4T.nvidia.com (10.127.8.9) by mail.nvidia.com (10.126.190.180) with Microsoft SMTP Server id 15.2.2562.20 via Frontend Transport; Thu, 19 Mar 2026 10:45:47 -0700 From: Akhil R To: CC: , , , , , , , , , , , , , , , , , , , , , , Subject: Re: [PATCH 04/12] i3c: master: Support ACPI enumeration Date: Thu, 19 Mar 2026 23:15:46 +0530 Message-ID: <20260319174546.18329-1-akhilrajeev@nvidia.com> X-Mailer: git-send-email 2.50.1 In-Reply-To: References: Precedence: bulk X-Mailing-List: linux-hwmon@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Content-Type: text/plain X-NV-OnPremToCloud: ExternallySecured X-EOPAttributedMessage: 0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: SJ1PEPF00002310:EE_|BL1PR12MB5876:EE_ X-MS-Office365-Filtering-Correlation-Id: 1b411289-d40a-48ab-b0ac-08de85df635f X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|82310400026|7416014|376014|1800799024|36860700016|18002099003|56012099003|22082099003; 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X-MS-Exchange-AntiSpam-MessageData-ChunkCount: 1 X-MS-Exchange-AntiSpam-MessageData-0: VKFzw6thxBZjESDrEYNHBhHwQDWBiIjdXhV02FH84i1bxHOH7KZES2Co2FnSSRjJwGGEKMzq0TmRgPak0zv9+FHGVdhT5EbKUH1hxjSMyej/JnH/QuB3k0HPPG4zzdc3okdkPCGV1a1pHsQ3LoiuaepymjCXbeLHGZ2TJkY3W/husmEvbmYduZoe7r137qrvVFmLKHnm3ZbpFznDzoWic7PdL1Hv5KMPtr2lTfGvplJ9gD3+jbuxACaxJ6UrcLNGKZjD9fVw2rWLws2Uv4qMiGBTdM8Ho+Adqpdf5qD1WZhAGJIj95Dl+TgZcV5WTC+T0wvQH717IPFVkY/iGgsBRjB7f4/KHN6kW5ZxeIs6ExgcIX6cFSq4A61xmFZLnIkMK7zKaRpkC5KNikNLIcNk3NjRnucIV8LX3U4Uus6rcYLx7LzrdGzHKydaYmpHqlex X-OriginatorOrg: Nvidia.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 19 Mar 2026 17:46:02.4334 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: 1b411289-d40a-48ab-b0ac-08de85df635f X-MS-Exchange-CrossTenant-Id: 43083d15-7273-40c1-b7db-39efd9ccc17a X-MS-Exchange-CrossTenant-OriginalAttributedTenantConnectingIp: TenantId=43083d15-7273-40c1-b7db-39efd9ccc17a;Ip=[216.228.118.232];Helo=[mail.nvidia.com] X-MS-Exchange-CrossTenant-AuthSource: SJ1PEPF00002310.namprd03.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: BL1PR12MB5876 On Thu, 19 Mar 2026 10:29:38 -0400, Frank Li wrote: > On Wed, Mar 18, 2026 at 10:57:17PM +0530, Akhil R wrote: >> Support ACPI enumeration for I2C and I3C devices on an I3C bus. >> Read _ADR and LVR from the ACPI resources and extract the data > > ADR have _, but not _ before LVR, I am not familary with ACPI. '_ADR' is a static ACPI object (or method), but LVR is not. LVR (Legacy Virtual Register) has to be read by parsing the ACPI I2C serial resource. > >> as per the ACPI specification for an I3C bus. Also read >> mipi-i3c-static-address as per the MIPI DISCO specifications [1] >> to get the static address to be used. >> >> Although the existing subsystem allows host controllers to register >> through the ACPI table, it was not possible to describe I3C or I2C >> devices there. > > why? The existing code relied on the 'reg' property to get PID, static address etc. ACPI table entries do not use reg property, instead use _ADR or other resource objects. Also for ACPI, MIPI recommends a different format which encodes the details in the _ADR object. The specification also includes a few additional properties like mipi-i3c-static-address, mipi-i3c-static-method etc. which the new code follows. > >> This change enables describing the I3C or I2C devices > > Don't use "This commit/change/" just Enable ... Ack. Will update. Best Regards, Akhil