default or selected kernelversion does not have config value CONFIG_LEDS_LP8864.
Result is shown for kernelversion 6.6.78

LED support for the TI LP8864/LP8866 4/6 channel LED drivers

modulename: leds-lp8864.ko

configname: CONFIG_LEDS_LP8864

Linux Kernel Configuration
└─>Device Drivers
└─>LED Support
└─>Device Tree and Open Firmware support
└─>LED support for the TI LP8864/LP8866 4/6 channel LED drivers
In linux kernel since version 6.6.78 (release Date: 2025-02-17)  
If you say yes here you get support for the TI LP8864-Q1,
LP8864S-Q1, LP8866-Q1, LP8866S-Q1 4/6 channel LED backlight
drivers with I2C interface.

To compile this driver as a module, choose M here: the
module will be called leds-lp8864.

source code: