linux-kernel - Re: [PATCH] earlycon: rework common framework for earlycon declarations

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Date:	Fri, 12 Feb 2016 11:05:55 +0100
From:	Arnd Bergmann <arnd@...db.de>
To:	Masahiro Yamada <yamada.masahiro@...ionext.com>
Cc:	linux-serial@...r.kernel.org, devicetree@...r.kernel.org,
	Rob Herring <robh@...nel.org>,
	Peter Hurley <peter@...leysoftware.com>,
	Greg KH <gregkh@...uxfoundation.org>,
	linux-arm-kernel@...ts.infradead.org, linux-arch@...r.kernel.org,
	Jiri Slaby <jslaby@...e.com>, linux-kernel@...r.kernel.org,
	Grant Likely <grant.likely@...aro.org>,
	Rob Herring <robh+dt@...nel.org>,
	Frank Rowand <frowand.list@...il.com>
Subject: Re: [PATCH] earlycon: rework common framework for earlycon declarations

On Friday 12 February 2016 18:28:16 Masahiro Yamada wrote:
> Commit 71f50c6d9a22 ("of: drop symbols declared by _OF_DECLARE() from
> modules") fixed the link error introduced by commit b8d20e06eaad
> ("serial: 8250_uniphier: add earlycon support").
> 
> After commit 2eaa790989e0 ("earlycon: Use common framework for
> earlycon declarations") was applied, the link error came back
> because the commit reworked OF_EARLYCON_DECLARE() to not use
> _OF_DECLARE().
> 
> This commit reworks OF_EARLYCON_DECLARE() again based on
> _OF_DECLARE().  My motivations are:
> 
>  - Fix the link error in a generic way (without patching
>    drivers/tty/serial/8250/8250_uniphier.c)
> 
>  - Delete struct earlycon_id.  This struct is re-inventing the wheel;
>    the fields "name", "compatible", "setup" can be implemented in
>    struct of_device_id as other framework do.
> 
> The difference between OF_EARLYCON_DECLARE() and other users of
> _OF_DECLARE is that OF_EARLYCON_DECLARE() needs to fill the "name"
> field of struct of_device_id.  To make it easier, a new macro
> _OF_DECLARE_WITH_NAME() has been added.  It fills the name field
> with the given argument.  On the other hand, _OF_DECLARE() sets the
> "name" field to a null string; this is the same behavior as before.
> 
> Fixes: 2eaa790989e0 ("earlycon: Use common framework for earlycon declarations")
> Signed-off-by: Masahiro Yamada <yamada.masahiro@...ionext.com>
> ---
> 
> I confirmed this patch can apply onto "next-20160212" tag of linux-next.
> 
> In order to apply it onto the "tty-next" branch of TTY subsytem,
> Grag will have to pull v4.5-rc3 in.

I think this is the right approach, and I can include it in my 8250
series when I resend it, and rebase the other patches on top of it
to simplify them.

Peter, since you did the change "earlycon: Use common framework for
earlycon declarations", are you ok with the new version?

	Arnd