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

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Message-ID: <CAE2855tGOq2jjqaZUnWJKL953iM6+9JCgkCAEXhKLkkLRdgUBg@mail.gmail.com>
Date:   Mon, 26 Mar 2018 20:56:45 -0600
From:   Aaron Durbin <adurbin@...omium.org>
To:     Alan Cox <gnomes@...rguk.ukuu.org.uk>
Cc:     Aaron Durbin <adurbin@...omium.org>,
        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, 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.

-Aaron