default or selected kernelversion does not have config value CONFIG_DRM_OMAP_PANEL_TPO_TD028TTEC1.
Result is shown for kernelversion 6.9.9

TPO TD028TTEC1 LCD Panel

modulename: panel-tpo-td028ttec1.ko

configname: CONFIG_DRM_OMAP_PANEL_TPO_TD028TTEC1

Linux Kernel Configuration
└─>Device Drivers
└─>Graphics support
└─>OMAPDRM External Display Device Drivers
└─>SPI support
└─>TPO TD028TTEC1 LCD Panel
In linux kernel since version 4.1 (release Date: 2015-06-21)  
LCD panel used in Openmoko.

source code: