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Mon, 2 Nov 2026 04:48:22 -0600 Received: from [10.24.50.20] (moteen-ubuntu-desk.dhcp.ti.com [10.24.50.20]) by lelvem-mr06.itg.ti.com (8.18.1/8.18.1) with ESMTP id 6A2AmHWO957669; Mon, 2 Nov 2026 04:48:18 -0600 Message-ID: Date: Mon, 2 Nov 2026 16:18:16 +0530 X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Post: List-Help: List-Subscribe: List-Unsubscribe: List-Owner: Precedence: list MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v2 1/3] dt-bindings: soc: ti: Document the ti,tda54-mcu-scm-conf binding To: Krzysztof Kozlowski CC: , , , , , , , , , , , , , , , , References: <20261027083700.1964371-1-m-shah@ti.com> <20261027083700.1964371-2-m-shah@ti.com> <20261028-inventive-screeching-bettong-9f4240@quoll> <6cecea78-658a-4278-b5c9-228a827583e0@kernel.org> Content-Language: en-US From: Moteen Shah In-Reply-To: <6cecea78-658a-4278-b5c9-228a827583e0@kernel.org> Content-Type: text/plain; charset="UTF-8"; format=flowed Content-Transfer-Encoding: 8bit X-EOPAttributedMessage: 0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: SJ5PEPF000001E9:EE_|CHBPR10MB780557:EE_ X-MS-Office365-Filtering-Correlation-Id: 7e2e56ad-15a4-455c-7090-08df38cee122 X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|7416014|376014|1800799024|23010399003|36860700016|82310400026|4143699003|56012099006|261028144727099003|261026121527099003|261022075727099003|261022105027099003|261026140227099003|10067099003|18002099003|22082099003|3023799007; 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You have a one, specific device, so >>> why the proxy id would vary per board? >>> >>> It also looks like re-implementing access controllers. >>> >>> Best regards, >>> Krzysztof >> >> Thanks for the review, Krzysztof. I’ll drop the redundant “binding” from >> the subject. >> >> ti,proxy-id is not intended to vary by board. It selects the proxy > Then it is implied by compatible, no? > >> window used by this Linux instance. One use case we need to support is >> running two VMs with different proxy IDs, with each VM’s DT describing >> the proxy it uses. >> The driver reads the ID from DT and performs register accesses through >> that proxy; it does not allocate proxy IDs or decide which VM uses which >> one. > And if not, my statement still feels applicable. I think my previous reply did not explain why this property belongs in the binding. In the current design, reg describes the SCM region and ti,proxy-id selects one of its proxy windows for this Linux instance. The compatible describes the SCM hardware; it does not select a proxy window. Our use case is separate VM DTs for two Linux instances using different proxy IDs. For a single non-virtualized Linux instance, the DT has one fixed ID but it can differ between VM instances. The property selects the view used by the driver; it does not allocate or grant access to a proxy. The information to the driver about the proxy via which it is supposed to perform the claim/lock operations, need to be supplied for a particular VM instance. I think DT would be the right way to do it. If you think some other way would be better please feel free to suggest. Regards, Moteen