help with lcd backlight 6577

hi guys
me need help with create LCD backlight file cust_leds.c for 6577 kk at this phone
its tinno77_s7505 (fly iq430 or wiko cink+)
phone scheme - https://yadi.sk/i/rOxK8nXRdBfpL
i know only about leds
{"red", MT65XX_LED_MODE_PWM, PWM2,{0}}
{"green", MT65XX_LED_MODE_PWM, PWM3,{0}}
but dont understand how works lcd backlight
may be someone can help me?
sorry i am fROM russia, and can talk with u only in english

I  didn't  do some  devlopment works on MT6577,but i should be the same on other platform of MTK.
You  should find out the EN pin of backlight chip in you scheme, and configure it  into PWM mode with the DrvGen.exe tools in your project source code.
then you can add the backlight parameter  in cust_leds.c like below,
{"lcd-backlight",     MT65XX_LED_MODE_PWM, PWM1,{1,1,2,2,0}},
as the param you should configure it correctly according to the datasheet  of the backlight chip.
you can have a try.

Please include your attachments