drivers/i2c/ptn3460: Add early init option

Create Kconfig options and boot state machine callback in ramstage for
an early initialization of the PTN3460 DP-to-LVDS bridge. This allows
showing the bootsplash screen on mainboards utilizing this chip during
the PCI device enumeration.

BUG=none
TEST=Select PTN3460_EARLY_INIT config switch in mainboard Kconfig and
check the log for "Attempting PTN3460 early init" message. If the
board (e.g. siemens/mc_apl7 in this case) is also configured for
showing the bootsplash logo, it should be now visible.

Change-Id: I5424d062b3fb63c78cfced3971376353be11c504
Signed-off-by: Jan Samek <jan.samek@siemens.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/67681
Reviewed-by: Angel Pons <th3fanbus@gmail.com>
Reviewed-by: Uwe Poeche <uwe.poeche@siemens.com>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>

0 files changed, 0 insertions, 0 deletions