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Mon, 5 Jan 2026 16:14:22 -0600 Received: from [128.247.81.19] (uda0506412.dhcp.ti.com [128.247.81.19]) by lelvem-mr05.itg.ti.com (8.18.1/8.18.1) with ESMTP id 605MENB01977329; Mon, 5 Jan 2026 16:14:23 -0600 Message-ID: Date: Mon, 5 Jan 2026 16:14:23 -0600 Precedence: bulk X-Mailing-List: devicetree@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH 3/3] arm64: boot: dts: ti: k3-am62l3-evm: enable WKUP UART wakeup from LPM To: Bryan Brattlof CC: Nishanth Menon , Vignesh Raghavendra , "Tero Kristo" , Rob Herring , "Krzysztof Kozlowski" , Conor Dooley , "Dhruva Gole" , , , , , , , , , References: <20251230-wkup-uart-wakeup-v1-0-cd6e15f8d956@ti.com> <20251230-wkup-uart-wakeup-v1-3-cd6e15f8d956@ti.com> <20260105140128.bd5tiheg3k6y2tyd@bryanbrattlof.com> Content-Language: en-US From: Kendall Willis In-Reply-To: <20260105140128.bd5tiheg3k6y2tyd@bryanbrattlof.com> Content-Type: text/plain; charset="UTF-8"; format=flowed Content-Transfer-Encoding: 7bit X-C2ProcessedOrg: 333ef613-75bf-4e12-a4b1-8e3623f5dcea X-EOPAttributedMessage: 0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: SJ5PEPF000001ED:EE_|DS7PR10MB4911:EE_ X-MS-Office365-Filtering-Correlation-Id: 01e7bac4-b7a3-4665-77f3-08de4ca7c9b5 X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|376014|1800799024|36860700013|82310400026; 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X-OriginatorOrg: ti.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 05 Jan 2026 22:14:25.9910 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: 01e7bac4-b7a3-4665-77f3-08de4ca7c9b5 X-MS-Exchange-CrossTenant-Id: e5b49634-450b-4709-8abb-1e2b19b982b7 X-MS-Exchange-CrossTenant-OriginalAttributedTenantConnectingIp: TenantId=e5b49634-450b-4709-8abb-1e2b19b982b7;Ip=[198.47.23.194];Helo=[lewvzet200.ext.ti.com] X-MS-Exchange-CrossTenant-AuthSource: SJ5PEPF000001ED.namprd05.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: DS7PR10MB4911 On 1/5/26 08:01, Bryan Brattlof wrote: > On December 30, 2025 thus sayeth Kendall Willis: >> Change the status of the wkup_uart0_interconnect node to enabled. The >> target-module node sets the UART SYSC and SYSS registers to allow wakeup >> from WKUP UART in DeepSleep low power mode. >> >> Signed-off-by: Kendall Willis >> --- >> arch/arm64/boot/dts/ti/k3-am62l3-evm.dts | 4 ++++ >> 1 file changed, 4 insertions(+) >> >> diff --git a/arch/arm64/boot/dts/ti/k3-am62l3-evm.dts b/arch/arm64/boot/dts/ti/k3-am62l3-evm.dts >> index cae04cce337366b50928d39b0c888550b14e43d3..02b1a1c76b2ee05d49cd69d199a6aacdb1973fa0 100644 >> --- a/arch/arm64/boot/dts/ti/k3-am62l3-evm.dts >> +++ b/arch/arm64/boot/dts/ti/k3-am62l3-evm.dts >> @@ -359,3 +359,7 @@ &usb1 { >> pinctrl-names = "default"; >> pinctrl-0 = <&usb1_default_pins>; >> }; >> + >> +&wkup_uart0_interconnect { >> + status = "okay"; >> +}; > > Does the UART need to be enabled as well? > > ~Bryan The UART does not need to be enabled because the interconnect target module manages the SYSC register which configures the WKUP_UART to be able to wakeup the SoC from system suspend. This allows the WKUP_UART to be wakeup capable for the SoC even if it is disabled by Linux. Best, Kendall