I have some problems on a Pine64 Plus to get the IR working.
Did you enable it in DT file? Anything that it isn't soldered on the board it's not enabled by default. Currently you have to decompile DT file, search for IR node, change status = "disabled"; to status = "okay"; and compile it. Note that change will be lost if you update your image.
Better solution exists (DT overlay), where you would change just one line in config file (similarly to RaspberryPi) and it would be persistent through updates, but it needs more work in LibreELEC build system.