I am working on a POV fidget spinner. I plan to use apa102-2020 micro LEDs. They will be controlled by a atiny84a for its small size, which I thought had Hardware SPI, but the compiler claims it is bit-banging the output, and I can’t drive the LEDs near POV speeds. I have data wired to MOSI and clock wired to SCK.
In this list the ATtiny is not mentioned: https://github.com/FastLED/FastLED/wiki/SPI-Hardware-or-Bit-banging
I´d go for a more powerful controller - mainly because of the very limited RAM a 84a has.