Handling System MMUs with an identifier is not flexible to manage
System MMU platform devices because of the following reasons:
1. A device driver which needs to handle System MMU must know the ID.
2. A System MMU may not present in some implementations of Exynos family.
3. Handling System MMU with IOMMU API does not require an ID.

This patch is the result of removing ID of System MMUs.
Instead, a device driver that needs to handle its System MMU must
use IOMMU API while its descriptor of platform device is given.

This patch also includes the following enhancements:
- A System MMU device becomes a child if its power domain device.
- clkdev
Signed-off-by: NKyongHo Cho <pullip.cho@samsung.com>
Signed-off-by: NKukjin Kim <kgene.kim@samsung.com>

This patch changes prefix of the clk register from S5P_ to
EXYNOS4_ for new EXYNOS SoCs such as EXYNOS5 and adds prefix
exynos4_ on clk declarations.
Signed-off-by: NKukjin Kim <kgene.kim@samsung.com>

This patch uses static declaration struct which is not
used in other file and re-arrange with group in header
file.
Signed-off-by: NKukjin Kim <kgene.kim@samsung.com>

This patch changes the name of clock.c to clock-exynos4.c for other
EXYNOS series such as EXYNOS5. And since the header file of clock
is used only in arch/arm/mach-exynos, moves it in the local directory.
Signed-off-by: NKukjin Kim <kgene.kim@samsung.com>

The arch/arm/mach-exynos4 directory (CONFIG_ARCH_EXYNOS4) has
made for plaforms based on EXYNOS4 SoCs. But since upcoming
Samsung's SoCs such as EXYNOS5 (ARM Cortex A15) can reuse most
codes in current mach-exynos4, one mach-exynos directory will
be used for them.

This patch changes to CONFIG_ARCH_EXYNOS (arch/arm/mach-exynos)
but keeps original CONFIG_ARCH_EXYNOS4 in mach-exynos/Kconfig to
avoid changing in driver side.

Cc: Arnd Bergmann <arnd@arndb.de>
Cc: Russell King <rmk+kernel@arm.linux.org.uk>
Signed-off-by: NKukjin Kim <kgene.kim@samsung.com>

This patch splits EXYNOS4 clock code to EXYNOS4 common,
EXYNOS4210 and EXYNOS4212 for supporting new EXYNOS4212
SoC with one kernel image. Of course, this patch adds
some clock codes for EXYNOS4212 SoC.
Signed-off-by: NKukjin Kim <kgene.kim@samsung.com>