drm/exynos: fimd: Hold pointer to driver data in context struct

This patch adds pointer to driver data to fimd_context structure, to
remove the need to call drm_fimd_get_driver_data() each time access to
driver data is necessary.

Signed-off-by: Tomasz Figa <tomasz.figa@gmail.com>
drm/exynos: fimd: Add support for FIMD versions without SHADOWCON register

Some platforms that can be supported with this driver have PRTCON
register instead of SHADOWCON, which requires slightly different
handling.

This patch factors out all register shadow control code from the driver
and adds a function to control register shadowing appropriately,
depending on driver data.

Signed-off-by: Tomasz Figa <tomasz.figa@gmail.com>
drm/exynos: fimd: Add support for FIMD variants with clock selection

Some platforms that can be supported this driver has additional clock
source selection bits in VIDCON0 register that allows to select which
clock should be used to drive the pixel clock: bus clock or special
clock.

Since this driver assumes that special clock always drives the pixel
clock, this patch sets the selection bitfield to use the special clock.

Signed-off-by: Tomasz Figa <tomasz.figa@gmail.com>
drm/exynos: fimd: Add support for S3C64xx SoCs

The FIMD block present on S3C6400/S3C6410 SoCs is compatible with this
driver, so it can be supported by it as well.

This patch adds appropriate device IDs and driver data to enable this
driver for S3C64xx SoCs.

Signed-off-by: Tomasz Figa <tomasz.figa@gmail.com>
drm/exynos: fimd: Get signal polarities from device tree

This patch modifies the driver to perform two stage parsing of video
timings from device tree, to get timing information as struct videomode,
which contains more data than struct fb_videomode.

Thanks to this change, information about polarity of control signals
(VSYNC, HSYNC, VDEN, VCLK) can be retrieved, in addition to standard
video timings.

Signed-off-by: Tomasz Figa <tomasz.figa@gmail.com>
ARM: dts: s3c64xx: Add node for display controller

This patch adds device tree node for the display controller present on
S3C64xx SoCs.

Signed-off-by: Tomasz Figa <tomasz.figa@gmail.com>
ARM: dts: s3c6410-mini6410: Add support for LCD screen

This patch adds necessary device tree nodes and properties to enable LCD
screen on mini6410 board.

Signed-off-by: Tomasz Figa <tomasz.figa@gmail.com>