linux-kernel - Re: [PATCH 1/3] serial: 8250_early: Add earlycon support for AMD Carrizo / Stoneyridge

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Date:   Thu, 29 Mar 2018 14:34:00 +0100
From:   Alan Cox <gnomes@...rguk.ukuu.org.uk>
To:     Aaron Durbin <adurbin@...omium.org>
Cc:     Andy Shevchenko <andy.shevchenko@...il.com>,
        Daniel Kurtz <djkurtz@...omium.org>,
        Ricardo Ribalda Delgado <ricardo.ribalda@...il.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Jiri Slaby <jslaby@...e.com>,
        Marc Gonzalez <marc_gonzalez@...madesigns.com>,
        Doug Anderson <dianders@...omium.org>,
        Matt Redfearn <matt.redfearn@...s.com>,
        Jeffy <jeffy.chen@...k-chips.com>,
        "open list:SERIAL DRIVERS" <linux-serial@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 1/3] serial: 8250_early: Add earlycon support for AMD
 Carrizo / Stoneyridge

On Mon, 26 Mar 2018 20:56:45 -0600
Aaron Durbin <adurbin@...omium.org> wrote:

> On Mon, Mar 26, 2018 at 12:24 PM, Alan Cox <gnomes@...rguk.ukuu.org.uk> wrote:
> >> Sadly, this situation
> >> is not unique to this hardware. There is hardware all over that does
> >> not meet the current assumptions being made in the early uart drivers
> >> within the kernel.  
> >
> > Is there any fundamental reason you can't just embed dt entries in the
> > ACPI table to describe the other features you need. I appreciate it
> > doesn't solve the generic PC case but it ought to help for anything where
> > the firmware cares about Linux ?  
> 
> What's the method for doing that? Using _DSD methods? Or have a
> pointer to examples? Sorry, I haven't spelunked into the current state
> of bridging ACPI and devicetree in a while.

ACPI 5.1 adds an _DSD method UUID for device properties.

The kernel device_property_* interface will pick them up just as if they
came from DT tables etc.

Alan