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Wed, 7 Oct 2026 11:22:13 +0200 Message-ID: Date: Wed, 7 Oct 2026 11:22:13 +0200 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH] arm64: dts: st: mark main supplies always-on on stm32mp257f-dk To: Mateusz Nowicki , Alexandre Torgue , Maxime Coquelin CC: Rob Herring , Krzysztof Kozlowski , Conor Dooley , , , , References: <20261004112421.47158-1-mateusz.nowicki@posteo.net> Content-Language: en-US From: Patrick DELAUNAY In-Reply-To: <20261004112421.47158-1-mateusz.nowicki@posteo.net> Content-Type: text/plain; charset="UTF-8"; format=flowed Content-Transfer-Encoding: 8bit X-Originating-IP: [10.48.87.100] X-ClientProxiedBy: ENXCAS1NODE2.st.com (10.75.128.138) To STKDAG1NODE2.st.com (10.75.128.133) X-EOPAttributedMessage: 0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: DB1PEPF00050A01:EE_|PR3PR10MB4094:EE_ X-MS-Office365-Filtering-Correlation-Id: 1eb7740c-f02d-4549-9860-08df24547a7a X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|23010399003|1800799024|82310400026|36860700016|376014|56012099006|11063799006|10067099003|6133799003|22082099003|18002099003; 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X-MS-Exchange-AntiSpam-MessageData-ChunkCount: 1 X-MS-Exchange-AntiSpam-MessageData-0: g6uzQhUgKigdyWjvZykgxHK+G0/Dlo0A3EBYIIyJ9LG9ApHIaM13ECaermfeHzXvDF4b39W/PbQUmikgi1a0Q4WE9mdm0UkZLgyascm15S3Q9ELm/YuCUkBA48ZJmJ/BiciOHy0uwCaUP4qMQjNFQvoU7Yy4GlV6v7CdcArXNpmKTc4mgbN+Le/Yd96MXKrmrlcbier4YWt5mZ45uwAhm45GhkyeNPA3RZJQT2c7diyTE/wRWEsVd/lW2PvV9oGWPVhRAuJ15N8Ygi14XmjEFolOSxFiYf8TsYxLsHPJ7RxqXohlj8wBJ2qjjmgdOTQNV+l2hCEy/JSiOGPrq3B3Q/Lpo3VINY7hSuBK+gmPyzc0YQD40m2yA75dxmMYA4DSfxbQXfxgDB+X5YtCmPhEaWomO/Fs1yRVMQ/I//P65bvZaGoXrrQxBUWCWJyW2dM2 X-OriginatorOrg: foss.st.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 07 Oct 2026 09:22:15.9335 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: 1eb7740c-f02d-4549-9860-08df24547a7a X-MS-Exchange-CrossTenant-Id: 75e027c9-20d5-47d5-b82f-77d7cd041e8f X-MS-Exchange-CrossTenant-OriginalAttributedTenantConnectingIp: TenantId=75e027c9-20d5-47d5-b82f-77d7cd041e8f;Ip=[164.130.1.59];Helo=[smtpO365.st.com] X-MS-Exchange-CrossTenant-AuthSource: DB1PEPF00050A01.eurprd03.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: PR3PR10MB4094 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.9.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20261007_022222_590265_814FDD49 X-CRM114-Status: GOOD ( 12.66 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org Hi, On 10/4/26 13:24, Mateusz Nowicki wrote: > The vddcore, v1v8 and v3v3 regulators have no consumer in Linux, so > the regulator core disables them 30 seconds after boot. They supply > the SoC digital logic, the SoC 1.8 V analog domain and the 3.3 V board > peripherals, and must stay on while Linux runs. > > Mark them always-on. > > Signed-off-by: Mateusz Nowicki > --- > arch/arm64/boot/dts/st/stm32mp257f-dk.dts | 3 +++ > 1 file changed, 3 insertions(+) > > diff --git a/arch/arm64/boot/dts/st/stm32mp257f-dk.dts b/arch/arm64/boot/dts/st/stm32mp257f-dk.dts > index a8f18508db3e..7a837e6fd578 100644 > --- a/arch/arm64/boot/dts/st/stm32mp257f-dk.dts > +++ b/arch/arm64/boot/dts/st/stm32mp257f-dk.dts > @@ -310,14 +310,17 @@ scmi_vddio1: regulator@0 { > scmi_vddcore: regulator@11 { > reg = ; > regulator-name = "vddcore"; > + regulator-always-on; > }; > scmi_v1v8: regulator@14 { > reg = ; > regulator-name = "v1v8"; > + regulator-always-on; > }; > scmi_v3v3: regulator@16 { > reg = ; > regulator-name = "v3v3"; > + regulator-always-on; > }; > scmi_vdd_emmc: regulator@18 { > reg = ; > > base-commit: f831584128ac2a36fb4fa62fe106793d08c2dbf1 For STMicroelectronics boards, the STPMIC always-on regulator are managed on SCMI server side in OP-TEE. So no need to manage this constraint in Linux device tree. This always-on  regulator are exposed only for information or to be used are supply for some IP. Regards Patrick