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