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Tue, 6 Jan 2026 05:56:58 -0600 Received: from localhost (uda0133052.dhcp.ti.com [128.247.81.232]) by lelvem-mr05.itg.ti.com (8.18.1/8.18.1) with ESMTP id 606BuwUA2962856; Tue, 6 Jan 2026 05:56:58 -0600 Date: Tue, 6 Jan 2026 05:56:58 -0600 From: Nishanth Menon To: Kendall Willis CC: Vignesh Raghavendra , Tero Kristo , Rob Herring , Krzysztof Kozlowski , Conor Dooley , Dhruva Gole , "Bryan Brattlof" , , , , , , , , , Subject: Re: [PATCH 3/3] arm64: boot: dts: ti: k3-am62l3-evm: enable WKUP UART wakeup from LPM Message-ID: <20260106115658.susgttqvokqeasz3@width> References: <20251230-wkup-uart-wakeup-v1-0-cd6e15f8d956@ti.com> <20251230-wkup-uart-wakeup-v1-3-cd6e15f8d956@ti.com> <20260105135520.rqnysf77ou2kggfh@shakiness> MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Disposition: inline In-Reply-To: X-C2ProcessedOrg: 333ef613-75bf-4e12-a4b1-8e3623f5dcea X-EOPAttributedMessage: 0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: BN3PEPF0000B06B:EE_|IA1PR10MB7166:EE_ X-MS-Office365-Filtering-Correlation-Id: c1a7248c-5219-4595-07db-08de4d1ab51d 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: 06 Jan 2026 11:57:03.5118 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: c1a7248c-5219-4595-07db-08de4d1ab51d 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: BN3PEPF0000B06B.namprd21.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: IA1PR10MB7166 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20260106_035709_694939_AC8188D7 X-CRM114-Status: GOOD ( 19.89 ) 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 16:10-20260105, Kendall Willis wrote: > 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. > If wkup_uart is controlled by firmware, it should be managed by firmware. $subject claims that wkup_uart is being enabled, but it is not. -- Regards, Nishanth Menon Key (0xDDB5849D1736249D) / Fingerprint: F8A2 8693 54EB 8232 17A3 1A34 DDB5 849D 1736 249D https://ti.com/opensource