linux-kernel - Re: [PATCH] serial: 8250: omap: set out-of-band wakeup if wakeup pinctrl exists

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Message-ID: <f7a2e47b-a37e-4735-91ea-4fcac3217186@ti.com>
Date: Fri, 16 Jan 2026 09:37:44 -0600
From: Kendall Willis <k-willis@...com>
To: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
CC: Jiri Slaby <jirislaby@...nel.org>, <d-gole@...com>, <vishalm@...com>,
	<sebin.francis@...com>, <msp@...libre.com>, <khilman@...libre.com>,
	<a-kaur@...com>, <s-kochidanadu@...com>, <linux-kernel@...r.kernel.org>,
	<linux-serial@...r.kernel.org>
Subject: Re: [PATCH] serial: 8250: omap: set out-of-band wakeup if wakeup
 pinctrl exists

On 1/16/26 07:16, Greg Kroah-Hartman wrote:
> On Tue, Dec 30, 2025 at 03:24:51PM -0600, Kendall Willis wrote:
>> In TI K3 SoCs, I/O daisy chaining is used to allow wakeup from UART when
>> the UART controller is off. Set UART device as wakeup capable using
>> out-of-band wakeup if the 'wakeup' pinctrl state exists and the device may
>> wakeup.
>>
>> Signed-off-by: Kendall Willis <k-willis@...com>
>> ---
>> Implementation
>> --------------
>> This patch is intended to be implemented along with the following
>> series. This patch has no dependencies on any of the other series:
>>
>> 1. "pmdomain: ti_sci: handle wakeup constraint for out-of-band wakeup":
>>     Skips setting constraints for wakeup sources that have out-of-band
>>     wakeup capability.
>>     https://github.com/kwillis01/linux/commits/v6.19/uart-daisy-chain/pmdomain
>>
>> 2. "serial: 8250: omap: set out-of-band wakeup if wakeup pinctrl exists"
>>     (this patch): Implements out-of-band wakeup from the UARTs for TI K3
>>     SoCs
>>     https://github.com/kwillis01/linux/tree/v6.19/uart-daisy-chain/uart-wakeup
>>
>> 3. "arm64: dts: ti: k3-am62: Support Main UART wakeup": Implements the
>>     functionality to wakeup the system from the Main UART
>>     https://github.com/kwillis01/linux/tree/b4/uart-daisy-chain-dts
> 
> How am I to pull any of this into the mainline kernel tree?  If this is
> dependant on those out-of-tree stuff, there's no need for me to take
> this now, please submit this all together properly.

This patch has no dependencies on the listed series. I listed them so 
that there was a full picture of the feature implementation. The 
"pmdomain: ti_sci: handle wakeup constraint for out-of-band wakeup" 
patch has been merged already [1]. The "arm64: dts: ti: k3-am62: Support 
Main UART wakeup" series is posted [2] and has a dependency on this 
patch. Sorry for the confusion with the GitHub links, in the future I 
either won't add them or will add lore links instead.

[1] https://lore.kernel.org/all/20251230-pmdomain-v1-1-3a009d1ff72e@ti.com/
[2] 
https://lore.kernel.org/all/20260106-b4-uart-daisy-chain-dts-v3-0-398a66258f2c@ti.com/

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

> 
> thanks,
> 
> greg k-h