linux-kernel - Re: [PATCH v3 0/5] arm64: dts: ti: k3-am62: Support Main UART wakeup

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Message-ID: <6c645e8b-8606-4fe6-8e88-0873e0a18d7f@ti.com>
Date: Thu, 15 Jan 2026 11:05:46 -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>,
	<d-gole@...com>, <msp@...libre.com>
CC: <vishalm@...com>, <sebin.francis@...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>
Subject: Re: [PATCH v3 0/5] arm64: dts: ti: k3-am62: Support Main UART wakeup

On 1/6/26 18:42, Kendall Willis wrote:
> 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.
> 
> Implementation
> --------------
> This series is intended to be implemented along with the following
> series:
> 
> 1. [MERGED] "pmdomain: ti_sci: handle wakeup constraint for out-of-band
>     wakeup" [1]: Skips setting constraints for wakeup sources that have
>     out-of-band wakeup capability.
> 
> 2. "serial: 8250: omap: set out-of-band wakeup if wakeup pinctrl exists"
>     [2]: Implements out-of-band 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 AM62P SK EVM board and a AM62L EVM board with all the above
> mentioned series implemented. Suspend/resume verified with the Main UART
> wakeup source by entering a keypress on the console.
> 
> This github branch has all the necessary patches to test the series
> using v6.19-rc1:
> https://github.com/kwillis01/linux/tree/v6.19/uart-daisy-chain/all
> 
> [1] https://lore.kernel.org/all/20251230-pmdomain-v1-1-3a009d1ff72e@ti.com/
> [2] https://lore.kernel.org/all/20251230-uart-wakeup-v1-1-13f1bb905f14@ti.com/
> 
> ---
> Changes in v3:
> - Reword commits to include the logic of how the "default" and "wakeup"
>    pinctrl states are used.
> - Revert pin logic so that main_uart0_pins_default and uart0_pins_default
>    are untouched.
> - Remove main_uart0_rx_pins_default and uart0_rx_pins_default.
> - Combine main_uart0 RX wakeup pin and main_uart0 TX pin into one group of
>    pins called main_uart0_pins_wakeup or uart0_pins_wakeup.
> - Revert pinctrl-0 to only include main_uart0_pins_wakeup or
>    uart0_pins_wakeup.
> - Change pinctrl-1 to only include main_uart0_pins_wakeup or
>    uart0_pins_wakeup.
> - Link to v2: https://lore.kernel.org/r/20251230-b4-uart-daisy-chain-dts-v2-0-fa5257ec54bb@ti.com
> 
> Changes in v2:
> - Define AM62L system idle states
> - Enable Main UART wakeup for AM62L SoC
> - Rebase to v6.19-rc3
> - Link to v1: https://lore.kernel.org/all/20250904212827.3730314-1-k-willis@ti.com/
> 
> ---
> Kendall Willis (5):
>        arm64: dts: ti: k3-am62l: Define possible system states
>        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
>        arm64: dts: ti: k3-am62l3-evm: Enable Main UART wakeup
> 
>   arch/arm64/boot/dts/ti/k3-am62a7-sk.dts        | 13 ++++++++++++-
>   arch/arm64/boot/dts/ti/k3-am62l.dtsi           | 12 ++++++++++++
>   arch/arm64/boot/dts/ti/k3-am62l3-evm.dts       | 11 ++++++++++-
>   arch/arm64/boot/dts/ti/k3-am62p5-sk.dts        | 13 ++++++++++++-
>   arch/arm64/boot/dts/ti/k3-am62x-sk-common.dtsi | 13 ++++++++++++-
>   5 files changed, 58 insertions(+), 4 deletions(-)
> ---
> base-commit: 6cd6c12031130a349a098dbeb19d8c3070d2dfbe
> change-id: 20251230-b4-uart-daisy-chain-dts-d01aa40560b2
> 
> Best regards,

This series depends on the patch "serial: 8250: omap: set out-of-band 
wakeup if wakeup pinctrl exists" [1].

[1] 
https://lore.kernel.org/all/20251230-uart-wakeup-v1-1-13f1bb905f14@ti.com/

Best,
Kendall Willis