linux-kernel - Re: [PATCH v7 7/7] Documentation: kernel-parameters: Add DEVNAME:0.0 format for serial ports

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Message-ID: <20240328060506.zhd7xctahudscoao@dhruva>
Date: Thu, 28 Mar 2024 11:35:06 +0530
From: Dhruva Gole <d-gole@...com>
To: Tony Lindgren <tony@...mide.com>
CC: Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Jiri Slaby
	<jirislaby@...nel.org>, Jonathan Corbet <corbet@....net>,
        Petr Mladek
	<pmladek@...e.com>, Steven Rostedt <rostedt@...dmis.org>,
        John Ogness
	<john.ogness@...utronix.de>,
        Sergey Senozhatsky <senozhatsky@...omium.org>,
        "David S . Miller" <davem@...emloft.net>,
        Andy Shevchenko
	<andriy.shevchenko@...ux.intel.com>,
        Ilpo Järvinen
	<ilpo.jarvinen@...ux.intel.com>,
        Johan Hovold <johan@...nel.org>,
        Sebastian
 Andrzej Siewior <bigeasy@...utronix.de>,
        Vignesh Raghavendra
	<vigneshr@...com>, <linux-kernel@...r.kernel.org>,
        <linux-serial@...r.kernel.org>, Sebastian Reichel <sre@...nel.org>,
        <linux-doc@...r.kernel.org>
Subject: Re: [PATCH v7 7/7] Documentation: kernel-parameters: Add DEVNAME:0.0
 format for serial ports

Hi Tony,

On Mar 27, 2024 at 12:59:41 +0200, Tony Lindgren wrote:
> Document the console option for DEVNAME:0.0 style addressing for serial
> ports.

Thanks, this will really add in more context for people unaware.

> 
> Suggested-by: Sebastian Reichel <sre@...nel.org>
> Signed-off-by: Tony Lindgren <tony@...mide.com>
> ---
>  .../admin-guide/kernel-parameters.txt         | 19 +++++++++++++++++++
>  1 file changed, 19 insertions(+)
> 
> diff --git a/Documentation/admin-guide/kernel-parameters.txt b/Documentation/admin-guide/kernel-parameters.txt
> --- a/Documentation/admin-guide/kernel-parameters.txt
> +++ b/Documentation/admin-guide/kernel-parameters.txt
> @@ -785,6 +785,25 @@
>  			Documentation/networking/netconsole.rst for an
>  			alternative.
>  
> +		<DEVNAME>:<n>.<n>[,options]
> +			Use the specified serial port on the serial core bus.
> +			The addressing uses DEVNAME of the physical serial port
> +			device, followed by the serial core controller instance,
> +			and the serial port instance. The options are the same
> +			as documented for the ttyS addressing above.
> +
> +			The mapping of the serial ports to the tty instances
> +			can be viewed with:
> +
> +			$ ls -d /sys/bus/serial-base/devices/*:*.*/tty/*
> +			/sys/bus/serial-base/devices/00:04:0.0/tty/ttyS0
> +
> +			In the above example, the console can be addressed with
> +			console=00:04:0.0. Note that a console addressed this
> +			way will only get added when the related device driver
> +			is ready. The use of an earlycon parameter in addition to
> +			the console may be desired for console output early on.

Reviewed-by: Dhruva Gole <d-gole@...com>

-- 
Best regards,
Dhruva