From mboxrd@z Thu Jan  1 00:00:00 1970
From: Tony Lindgren <tony@atomide.com>
Subject: Re: [PATCH v1 0/3] console, serial8250: Disable PM and DMA ops
Date: Thu, 17 May 2018 06:56:21 -0700
Message-ID: <20180517135621.GJ98604@atomide.com>
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To: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Cc: Sebastian Andrzej Siewior <bigeasy@linutronix.de>, Andy Shevchenko <andy.shevchenko@gmail.com>, Petr Mladek <pmladek@suse.com>, Sergey Senozhatsky <sergey.senozhatsky@gmail.com>, Steven Rostedt <rostedt@goodmis.org>, Linux Kernel Mailing List <linux-kernel@vger.kernel.org>, Greg Kroah-Hartman <gregkh@linuxfoundation.org>, Jiri Slaby <jslaby@suse.com>, "open list:SERIAL DRIVERS" <linux-serial@vger.kernel.org>, Arnd Bergmann <arnd@arndb.de>
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* Andy Shevchenko <andriy.shevchenko@linux.intel.com> [180516 13:12]:
> On Wed, 2018-05-16 at 12:47 +0200, Sebastian Andrzej Siewior wrote:
> > But since I am on it. You have to enable runtime-PM for the UART. So
> > what is the problem if you simply don't enable it for the UART which
> > used as the kernel console?
> 
> How do I know at the ->probe() time that device in question is going to
> be kernel console? Maybe I missed simple way of it.

Hmm parse the kernel cmdline maybe? :)

BTW, kernel already has earlycon doing exactly what you're trying to do.

Regards,

Tony