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Mon, 5 Jan 2026 16:10:14 -0600 Received: from [128.247.81.19] (uda0506412.dhcp.ti.com [128.247.81.19]) by lelvem-mr06.itg.ti.com (8.18.1/8.18.1) with ESMTP id 605MAE391853241; Mon, 5 Jan 2026 16:10:14 -0600 Message-ID: Date: Mon, 5 Jan 2026 16:10:14 -0600 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: Nishanth Menon CC: Vignesh Raghavendra , Tero Kristo , Rob Herring , Krzysztof Kozlowski , Conor Dooley , Dhruva Gole , "Bryan Brattlof" , , , , , , , , , References: <20251230-wkup-uart-wakeup-v1-0-cd6e15f8d956@ti.com> <20251230-wkup-uart-wakeup-v1-3-cd6e15f8d956@ti.com> <20260105135520.rqnysf77ou2kggfh@shakiness> Content-Language: en-US From: Kendall Willis In-Reply-To: <20260105135520.rqnysf77ou2kggfh@shakiness> 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: SJ1PEPF00002320:EE_|DS0PR10MB997555:EE_ X-MS-Office365-Filtering-Correlation-Id: 3ec77b14-4c5e-463d-ac16-08de4ca73540 X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|82310400026|36860700013|376014|1800799024; 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X-OriginatorOrg: ti.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 05 Jan 2026 22:10:16.8890 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: 3ec77b14-4c5e-463d-ac16-08de4ca73540 X-MS-Exchange-CrossTenant-Id: e5b49634-450b-4709-8abb-1e2b19b982b7 X-MS-Exchange-CrossTenant-OriginalAttributedTenantConnectingIp: TenantId=e5b49634-450b-4709-8abb-1e2b19b982b7;Ip=[198.47.23.195];Helo=[lewvzet201.ext.ti.com] X-MS-Exchange-CrossTenant-AuthSource: SJ1PEPF00002320.namprd03.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: DS0PR10MB997555 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20260105_141023_315236_D2FB66DE X-CRM114-Status: GOOD ( 12.63 ) 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 On 1/5/26 07:55, Nishanth Menon wrote: > On 20:51-20251230, Kendall Willis wrote: >> 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"; >> +}; > > don't we need to set status okay and provide pinmux for wkup_uart? > No, only the interconnect target node needs to be enabled because it manages the SYSC register. The SYSC register configures the WKUP_UART to be able to wakeup the SoC from system suspend. This allows the WKUP_UART to be wakeup capable even if it is reserved by firmware. Best, Kendall >> >> -- >> 2.34.1 >> >