linux-kernel - Re: [PATCH 0/5] serial: 8250: omap: Add am62 wakeup support

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Message-ID: <20240523190724.GA31756@francesco-nb>
Date: Thu, 23 May 2024 21:07:24 +0200
From: Francesco Dolcini <francesco@...cini.it>
To: Markus Schneider-Pargmann <msp@...libre.com>
Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Jiri Slaby <jirislaby@...nel.org>, Rob Herring <robh@...nel.org>,
	Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
	Conor Dooley <conor+dt@...nel.org>,
	Tony Lindgren <tony@...mide.com>,
	John Ogness <john.ogness@...utronix.de>,
	Uwe Kleine-König <u.kleine-koenig@...gutronix.de>,
	Ronald Wahl <ronald.wahl@...itan.com>,
	Thomas Richard <thomas.richard@...tlin.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
	Arnd Bergmann <arnd@...db.de>,
	Vignesh Raghavendra <vigneshr@...com>,
	Vibhore Vardhan <vibhore@...com>,
	Kevin Hilman <khilman@...libre.com>, Dhruva Gole <d-gole@...com>,
	linux-kernel@...r.kernel.org, linux-serial@...r.kernel.org,
	devicetree@...r.kernel.org
Subject: Re: [PATCH 0/5] serial: 8250: omap: Add am62 wakeup support

Hello Markus,

On Thu, May 23, 2024 at 09:58:14AM +0200, Markus Schneider-Pargmann wrote:
> Hi,
> 
> to support wakeup from Partial-IO using serial pins of mcu_uart0 and
> wkup_uart0, this series adds a new pinctrl state 'wakeup' in which
> specific wakeup flags are set on these pins. Partial-IO is a poweroff
> state of the SoC in which only a few pingroups are partly powered.
> 
> If the user enabled wakeup from the serial port, the pinctrl state is
> selected on shutdown. For another deep sleep state, which is comparable
> with suspend to memory, the same pinctrl state is selected on suspend as
> well.
> 

..

> 
> After enabling Wake-on-LAN the system can be powered off and will enter
> the Partial-IO state in which it can be woken up by activity on the
> specific pins:
>     ethtool -s can0 wol p
>     ethtool -s can1 wol p
>     poweroff

Confused ... Why the CAN? This is about the UART.

Francesco