Well, as long as it doesn't modify existing files, yes. But if it modifies (=patches) existing files, then you need to download the patch and apply it normally as a patch. Something like "patch -p 1 -i FILENAME" from the buildroot directory.
Your patch seems to actually add support for a specific Huawei modem, right?
What is your ultimate goal? What do you actually want to do?
Looking at your messages in several thread,s it looks like you seeking for a driver for a certain USB modem, right?
I want to have NCM support in LuCI, with the help of the community, it's OK now
And now, I would like to have NCM status in LuCI homepage like this:
It is my last goal
I succeeded set up NCM protocol in LEDE with my Huawei E3372, connection is OK even if sometimes NCM connection stop working suddenly, whereas interface is OK. I will create maybe a topic for that