From mboxrd@z Thu Jan  1 00:00:00 1970
From: David Miller <davem@davemloft.net>
Subject: Re: [balbi-usb:xceiv 3/3] drivers/usb/phy/rcar-phy.c:75:3: error:
 implicit declaration of function 'iowrite32'
Date: Thu, 01 Nov 2012 11:07:29 -0400 (EDT)
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From: Max Filippov <jcmvbkbc@gmail.com>
Date: Thu, 1 Nov 2012 16:47:14 +0300

> Strange, AFAICS architectures that use asm-generic/io.h (blackfin, openrisc,
> score, unicore32 and xtensa) also provide those functions.

They define HAVE_IOMEM, s390 does not, therefore you must protect
the driver Kconfig with HAVE_IOMEM.