linux-kernel - [PATCH 0/3] arm64: dts: ti: k3-am62: Support Main UART wakeup

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Message-ID: <20250904212827.3730314-1-k-willis@ti.com>
Date: Thu, 4 Sep 2025 16:28:24 -0500
From: Kendall Willis <k-willis@...com>
To: <nm@...com>, <vigneshr@...com>, <kristo@...nel.org>, <robh@...nel.org>,
        <krzk+dt@...nel.org>, <conor+dt@...nel.org>,
        <linux-arm-kernel@...ts.infradead.org>, <devicetree@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>
CC: <d-gole@...com>, <vishalm@...com>, <sebin.francis@...com>,
        <msp@...libre.com>, <khilman@...libre.com>, <a-kaur@...com>,
        <k-willis@...com>
Subject: [PATCH 0/3] arm64: dts: ti: k3-am62: Support Main UART wakeup

This series adds wakeup support for the Main UART in the device tree of
the TI AM62 family of devices. It defines the specific pins and pinctrl
states needed to wakeup the system from the Main UART via I/O
daisy-chaining. The wakeup-source property is configured to describe the
low power modes the system can wakeup from using the Main UART.

Dependencies
------------
This series is dependent on the following series [1] to be merged into
the kernel. The series adds the system idle states that are available on
the SoCs. The system idle states are used when configuring the
wakeup-source property.

This series is also dependent on the following patch [2] to be merged
into the kernel. The patch integrates the PIN_WKUP_EN macro which
enables the WKUP_EN bit.

Implementation
--------------
This series is intended to be implemented along with the following
series:

1. "pmdomain: ti_sci: Handle wakeup constraint if device has pinctrl
   wakeup state": Patch which skips setting constraints for wakeup sources
   that use pinctrl state 'wakeup'.

2. "serial: 8250: omap: Add wakeup support": Implements
   wakeup from the UARTs for TI K3 SoCs

3. "arm64: dts: ti: k3-am62: Support Main UART wakeup": (this series)
   implements the functionality to wakeup the system from the Main UART

Testing
-------
Tested on a SK-AM62B-P1 board with all series and dependencies
implemented. Suspend/resume verified with the Main UART wakeup source
by entering a keypress on the console.

[1] https://lore.kernel.org/linux-arm-kernel/20250812-topic-am62-dt-partialio-v6-15-v2-2-25352364a0ac@baylibre.com/
[2] https://lore.kernel.org/all/20250904112538.529857-4-a-kaur@ti.com/

Kendall Willis (3):
  arm64: dts: ti: k3-am62x-sk-common: Enable Main UART wakeup
  arm64: dts: ti: k3-am62a7-sk: Enable Main UART wakeup
  arm64: dts: ti: k3-am62p5-sk: Enable Main UART wakeup

 arch/arm64/boot/dts/ti/k3-am62a7-sk.dts       | 24 +++++++++++++++----
 arch/arm64/boot/dts/ti/k3-am62p5-sk.dts       | 24 +++++++++++++++----
 .../arm64/boot/dts/ti/k3-am62x-sk-common.dtsi | 24 +++++++++++++++----
 3 files changed, 60 insertions(+), 12 deletions(-)

base-commit: 4ac65880ebca1b68495bd8704263b26c050ac010
-- 
2.34.1