video: Support for SSD2828 (parallel LCD to MIPI bridge)

This is the v2 of

    http://lists.denx.de/pipermail/u-boot/2015-January/200807.html

It addresses the review comments.

One other change is the introduction of CONFIG_VIDEO_LCD_SSD2828_TX_CLK option. The Allwinner A20 reference tablet schematics suggests the use of 12MHz for 'tx_clk'. But the MSI Primo81 tablet has it as 27MHz. So it can be indeed different in different devices and deserves a config option. The patch "video: sunxi: Switch from 'tx_clk' to 'pclk' for SSD2828" had been dropped, because the Kconfig option makes it unnecessary.

Other than MSI Primo81, there is at least one more tablet with SSD2828:
http://linux-sunxi.org/ICOU_Fatty_I
Inspecting Android kernel sources indicates that two more GPIO pins are needed to support it. These changes can be submitted as a separate patchset later.

Siarhei Siamashka (7):
sunxi: axp221: Add ELDO[1-3] support
include: Add header file with MIPI DSI constants from linux 3.18
video: Add support for SSD2828 (parallel LCD to MIPI bridge)
video: sunxi: Hook up SSD2828 with the sunxi video driver
sun6i: Add LCD display support for MSI Primo81 tablet
video: ssd2828: Allow using 'pclk' as the PLL clock source
video: ssd2828: Use MIPI DCS commands to retrieve the LCD panel id

 board/sunxi/Kconfig           |   7 +
 board/sunxi/board.c           |   1 +
 configs/MSI_Primo81_defconfig |  10 +
 drivers/power/Kconfig         |  10 +
 drivers/power/axp221.c        |  33 +++
 drivers/video/Kconfig         |  72 ++++++
 drivers/video/Makefile        |   1 +
 drivers/video/ssd2828.c       | 578 ++++++++++++++++++++++++++++++++++++++++++
 drivers/video/ssd2828.h       | 128 ++++++++++
 drivers/video/sunxi_display.c |  38 +++
 include/axp221.h              |   7 +
 include/mipi_display.h        | 130 ++++++++++
 12 files changed, 1015 insertions(+)
 create mode 100644 drivers/video/ssd2828.c
 create mode 100644 drivers/video/ssd2828.h
 create mode 100644 include/mipi_display.h

2.0.5