Blink LED in STM32MP257f using yacto layer

[rishiWimate]

I have started working on STM32MP257f board. I have installed open st linux distribution package on my board. Now I want to blink led on my board using my own yacto customized layer. Can anyone please help me with the steps. I have executed simple helloworld program using my own yacto layer, now I want to access gpio periheral using A-35 core.