linux-kernel - [PATCH 0/3] arm64: boot: dts: ti: k3-am62l: enable WKUP UART wakeup

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Message-ID: <20251230-wkup-uart-wakeup-v1-0-cd6e15f8d956@ti.com>
Date: Tue, 30 Dec 2025 20:51:39 -0600
From: Kendall Willis <k-willis@...com>
To: Nishanth Menon <nm@...com>, Vignesh Raghavendra <vigneshr@...com>, "Tero
 Kristo" <kristo@...nel.org>, Rob Herring <robh@...nel.org>, "Krzysztof
 Kozlowski" <krzk+dt@...nel.org>, Conor Dooley <conor+dt@...nel.org>, "Dhruva
 Gole" <d-gole@...com>, Bryan Brattlof <bb@...com>
CC: <vishalm@...com>, <sebin.francis@...com>, <msp@...libre.com>,
	<khilman@...libre.com>, <a-kaur@...com>, <s-kochidanadu@...com>,
	<linux-arm-kernel@...ts.infradead.org>, <devicetree@...r.kernel.org>,
	<linux-kernel@...r.kernel.org>, Kendall Willis <k-willis@...com>
Subject: [PATCH 0/3] arm64: boot: dts: ti: k3-am62l: enable WKUP UART
 wakeup

K3 TI AM62L SoC supports wakeup from WKUP UART when the SoC is in the
DeepSleep low power mode. To enable 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 to allow wakeup
from WKUP UART when the system is suspended. 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.

Testing
-------
Tested on AM62L EVM on v6.19-rc3. Suspend/resume verified with the WKUP
UART wakeup source by entering a keypress on the console. 

[1] https://www.ti.com/lit/ug/sprujb4a/sprujb4a.pdf

Signed-off-by: Kendall Willis <k-willis@...com>
---
Kendall Willis (3):
      arm64: dts: ti: k3-am62l: include WKUP_UART0 in wakeup peripheral window
      arm64: boot: dts: ti: k3-am62l-wakeup: create label for target-module
      arm64: boot: dts: ti: k3-am62l3-evm: enable WKUP UART wakeup from LPM

 arch/arm64/boot/dts/ti/k3-am62l-wakeup.dtsi | 2 +-
 arch/arm64/boot/dts/ti/k3-am62l.dtsi        | 4 ++--
 arch/arm64/boot/dts/ti/k3-am62l3-evm.dts    | 4 ++++
 3 files changed, 7 insertions(+), 3 deletions(-)
---
base-commit: 5dc233097d4f94776c0c3f6edfd7476281478dc3
change-id: 20251230-wkup-uart-wakeup-8bbc95aa8f8e

Best regards,
-- 
Kendall Willis <k-willis@...com>