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Wed, 7 Jan 2026 10:45:04 -0600 Date: Wed, 7 Jan 2026 10:45:04 -0600 From: Bryan Brattlof To: Kendall Willis CC: Nishanth Menon , Vignesh Raghavendra , "Tero Kristo" , Rob Herring , "Krzysztof Kozlowski" , Conor Dooley , "Dhruva Gole" , , , , , , , , , Subject: Re: [PATCH v2 0/3] arm64: boot: dts: ti: k3-am62l: allow WKUP UART wakeup from LPM Message-ID: <20260107164504.ehvbfizg7ybbvv2e@bryanbrattlof.com> X-PGP-Fingerprint: D3D1 77E4 0A38 DF4D 1853 FEEF 41B9 0D5D 71D5 6CE0 References: <20260106-wkup-uart-wakeup-v2-0-fb4cbd56c827@ti.com> Precedence: bulk X-Mailing-List: devicetree@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Disposition: inline In-Reply-To: <20260106-wkup-uart-wakeup-v2-0-fb4cbd56c827@ti.com> X-C2ProcessedOrg: 333ef613-75bf-4e12-a4b1-8e3623f5dcea X-EOPAttributedMessage: 0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: SJ1PEPF00001CDD:EE_|BN0PR10MB5144:EE_ X-MS-Office365-Filtering-Correlation-Id: e2665969-bda0-4318-4bdc-08de4e0c1f1a X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|82310400026|1800799024|376014|36860700013; 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X-OriginatorOrg: ti.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 07 Jan 2026 16:45:10.0311 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: e2665969-bda0-4318-4bdc-08de4e0c1f1a X-MS-Exchange-CrossTenant-Id: e5b49634-450b-4709-8abb-1e2b19b982b7 X-MS-Exchange-CrossTenant-OriginalAttributedTenantConnectingIp: TenantId=e5b49634-450b-4709-8abb-1e2b19b982b7;Ip=[198.47.21.195];Helo=[flwvzet201.ext.ti.com] X-MS-Exchange-CrossTenant-AuthSource: SJ1PEPF00001CDD.namprd05.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: BN0PR10MB5144 On January 6, 2026 thus sayeth Kendall Willis: > K3 TI AM62L SoC supports wakeup from WKUP UART when the SoC is in the > DeepSleep low power mode. To allow wakeup from WKUP UART the target-module > device tree node is enabled. The ti-sysc interconnect target module driver > is used to configure the the SYSCONFIG related registers. In this case, > the interconnect target module node configures the WKUP UART to be able to > wakeup from system suspend. The SYSC register is used to enable wakeup > from system suspend for the WKUP UART. Refer to 14.7.2.5 UART in the > AM62L Techincal Reference Manual for registers referenced [1]. > > Previous TI SoCs configure the WKUP UART to wakeup from system suspend > using the ti-sysc interconnect target module driver. Refer to commit > ce27f7f9e328 ("arm64: dts: ti: k3-am62-wakeup: Configure ti-sysc for > wkup_uart0") for an example of this. I think I may be confused. What is setting the pinmux for the wkup_uart to allow us to trigger the wake event? It looks like they reset to GPIO pins if not set. Is firmware doing this? ~Bryan