linux-kernel - Re: [RESEND][PATCH] ARM: PL011: add support for extended FIFO-size of PL011-r1p5

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Date:	Sun, 21 Apr 2013 09:54:42 +0100
From:	Russell King - ARM Linux <linux@....linux.org.uk>
To:	Linus Walleij <linus.walleij@...aro.org>
Cc:	Jongsung Kim <neidhard.kim@....com>,
	Greg KH <gregkh@...uxfoundation.org>,
	Jiri Slaby <jslaby@...e.cz>,
	"linux-serial@...r.kernel.org" <linux-serial@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [RESEND][PATCH] ARM: PL011: add support for extended FIFO-size
	of PL011-r1p5

On Sat, Apr 20, 2013 at 03:31:39PM +0200, Linus Walleij wrote:
> static struct amba_id pl011_ids[] = {
>         {
>                 .id     = 0x00341011,
>                 .mask   = 0x00ffffff,
>                 .data   = &vendor_arm_deepfifo,
>         },
> (...)
> };
> 
> As you can see in amba_lookup() in
> drivers/amba/bus.c the table is traversed from the top,
> so for the new "3" variant this entry will match, while the
> next entry will match all older versions.

This isn't equivalent - this will only match variant 3, not any later
ones.  The original patch uses the deep fifo for variant 3 or larger.
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