mmc: code cleanup and support DDR mode

If card and host are supported DDR mode, then it can be used the DDR mode. This patch-set has dependency about beomho's patch-set. (Based-on u-boot-samsung repository)

http://patchwork.ozlabs.org/patch/331986/
http://patchwork.ozlabs.org/patch/331987/
http://patchwork.ozlabs.org/patch/331989/
http://patchwork.ozlabs.org/patch/331988/

It's result for loading uImage.

sdhci controller ->5260488 bytes read in 259 ms (19.4 MiB/s) dwmmc controller without DDR mode -> 5260488 bytes read in 202 ms (24.8 MiB/s) dwmmc controller with DDR mode -> 5260488 bytes read in 118 ms (42.5 MiB/s)

Jaehoon Chung (9):
mmc: s5p_sdhci: add the s5p_sdhci_core_init function
ARM: exynos: board: change the mmc/sd init sequence
ARM: exynos: clock: modify the set_mmc_clk for exynos4
mmc: exynos_dw_mmc: restore the property into host
mmc: remove the unnecessary define and fix the wrong bit control
mmc: support the DDR mode for eMMC
mmc: dw_mmc: support the DDR mode
ARM: dts: exnyos: enable dw-mmc controller
mmc: exynos_dw_mmc: enable the DDR mode

 arch/arm/cpu/armv7/exynos/clock.c  |   16 ++-
 arch/arm/dts/exynos4412-trats2.dts |    6 +-
 board/samsung/common/board.c       |   13 +--
 drivers/mmc/dw_mmc.c               |   10 +-
 drivers/mmc/exynos_dw_mmc.c        |  215 ++++++++++++++++++++++--------------
 drivers/mmc/mmc.c                  |   15 ++-
 drivers/mmc/s5p_sdhci.c            |   43 +++-----
 include/dwmmc.h                    |    2 +
 include/mmc.h                      |   25 +++--
 10 files changed, 214 insertions(+), 134 deletions(-)

1.7.9.5