I am using imx287 processor based board for one of my Infotainment project. In this product lcd panel backlight is controlling by PWM4. I tried to enable the CONFIG_BACKLIGHT_PWM and HAVE_PWM options, but those are not available in my ltib setup. I tried to build these options by modifying the corresponding make files (drivers/video/backlight/Makefile and arch/arm/plat-mxc) and ended up with build erros. Please let me know whether I am following wrong approach?