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

[Tony Lindgren]

* Andy Shevchenko <andriy.shevchenko@xxxxxxxxxxxxxxx> [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