I am looking for how to add a gpio expander PCA9555 in the kernel of my bbb.
If I understand correctly, you must add a module to my PCA9555.
The module in question is called gpio-pca953x, and we must build.
I try to compile the file gpio-pca953x.c to a module but I do not.
If someone can guide me on how to proceed, it would be nice.