mirror of
https://github.com/brain-hackers/u-boot-brain
synced 2024-07-13 14:46:21 +09:00
dddccd6913
Instead of using the internal 'tx_clk' clock source, it is also
possible to use the pixel clock signal from the parallel LCD
interface ('pclk') as the reference clock for PLL.
The 'tx_clk' clock speed may be different on different boards/devices
(the allowed range is 8MHz - 30MHz). Which is not very convenient,
especially considering the need to know the exact 'tx_clk' clock
speed. This clock speed may be difficult to identify without having
device schematics and/or accurate documentation/sources every time.
Using 'pclk' is free from all these problems.
Signed-off-by: Siarhei Siamashka <siarhei.siamashka@gmail.com>
Acked-by: Anatolij Gustschin <agust@denx.de>
Acked-by: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: Hans de Goede <hdegoede@redhat.com>
81 lines
3.1 KiB
Plaintext
81 lines
3.1 KiB
Plaintext
config VIDEO_X86
|
|
bool "Enable x86 video driver support"
|
|
depends on X86
|
|
default n
|
|
help
|
|
Turn on this option to enable a very simple driver which uses vesa
|
|
to discover the video mode and then provides a frame buffer for use
|
|
by U-Boot.
|
|
|
|
config VIDEO_LCD_SSD2828
|
|
bool "SSD2828 bridge chip"
|
|
default n
|
|
---help---
|
|
Support for the SSD2828 bridge chip, which can take pixel data coming
|
|
from a parallel LCD interface and translate it on the fly into MIPI DSI
|
|
interface for driving a MIPI compatible LCD panel. It uses SPI for
|
|
configuration.
|
|
|
|
config VIDEO_LCD_SSD2828_TX_CLK
|
|
int "SSD2828 TX_CLK frequency (in MHz)"
|
|
depends on VIDEO_LCD_SSD2828
|
|
default 0
|
|
---help---
|
|
The frequency of the crystal, which is clocking SSD2828. It may be
|
|
anything in the 8MHz-30MHz range and the exact value should be
|
|
retrieved from the board schematics. Or in the case of Allwinner
|
|
hardware, it can be usually found as 'lcd_xtal_freq' variable in
|
|
FEX files. It can be also set to 0 for selecting PCLK from the
|
|
parallel LCD interface instead of TX_CLK as the PLL clock source.
|
|
|
|
config VIDEO_LCD_SSD2828_RESET
|
|
string "RESET pin of SSD2828"
|
|
depends on VIDEO_LCD_SSD2828
|
|
default ""
|
|
---help---
|
|
The reset pin of SSD2828 chip. This takes a string in the format
|
|
understood by 'name_to_gpio' function, e.g. PH1 for pin 1 of port H.
|
|
|
|
config VIDEO_LCD_SPI_CS
|
|
string "SPI CS pin for LCD related config job"
|
|
depends on VIDEO_LCD_SSD2828
|
|
default ""
|
|
---help---
|
|
This is one of the SPI communication pins, involved in setting up a
|
|
working LCD configuration. The exact role of SPI may differ for
|
|
different hardware setups. The option takes a string in the format
|
|
understood by 'name_to_gpio' function, e.g. PH1 for pin 1 of port H.
|
|
|
|
config VIDEO_LCD_SPI_SCLK
|
|
string "SPI SCLK pin for LCD related config job"
|
|
depends on VIDEO_LCD_SSD2828
|
|
default ""
|
|
---help---
|
|
This is one of the SPI communication pins, involved in setting up a
|
|
working LCD configuration. The exact role of SPI may differ for
|
|
different hardware setups. The option takes a string in the format
|
|
understood by 'name_to_gpio' function, e.g. PH1 for pin 1 of port H.
|
|
|
|
config VIDEO_LCD_SPI_MOSI
|
|
string "SPI MOSI pin for LCD related config job"
|
|
depends on VIDEO_LCD_SSD2828
|
|
default ""
|
|
---help---
|
|
This is one of the SPI communication pins, involved in setting up a
|
|
working LCD configuration. The exact role of SPI may differ for
|
|
different hardware setups. The option takes a string in the format
|
|
understood by 'name_to_gpio' function, e.g. PH1 for pin 1 of port H.
|
|
|
|
config VIDEO_LCD_SPI_MISO
|
|
string "SPI MISO pin for LCD related config job (optional)"
|
|
depends on VIDEO_LCD_SSD2828
|
|
default ""
|
|
---help---
|
|
This is one of the SPI communication pins, involved in setting up a
|
|
working LCD configuration. The exact role of SPI may differ for
|
|
different hardware setups. If wired up, this pin may provide additional
|
|
useful functionality. Such as bi-directional communication with the
|
|
hardware and LCD panel id retrieval (if the panel can report it). The
|
|
option takes a string in the format understood by 'name_to_gpio'
|
|
function, e.g. PH1 for pin 1 of port H.
|