linux-kernel - Re: [PATCH v1 0/3] console, serial8250: Disable PM and DMA ops

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Message-ID: <20180517135621.GJ98604@atomide.com>
Date:   Thu, 17 May 2018 06:56:21 -0700
From:   Tony Lindgren <tony@...mide.com>
To:     Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
Cc:     Sebastian Andrzej Siewior <bigeasy@...utronix.de>,
        Andy Shevchenko <andy.shevchenko@...il.com>,
        Petr Mladek <pmladek@...e.com>,
        Sergey Senozhatsky <sergey.senozhatsky@...il.com>,
        Steven Rostedt <rostedt@...dmis.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Jiri Slaby <jslaby@...e.com>,
        "open list:SERIAL DRIVERS" <linux-serial@...r.kernel.org>,
        Arnd Bergmann <arnd@...db.de>
Subject: Re: [PATCH v1 0/3] console, serial8250: Disable PM and DMA ops

* Andy Shevchenko <andriy.shevchenko@...ux.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