Powering Pro Trinket with Raspberry Pi Zero W Pins

[trecneps]

I am using a Pro Trinket (the 5V 16MHz version) with a Raspberry Pi Zero W for a project. Can I just solder the 5V and GND pins on the Pi to those pins on the Trinket for power?
The reason I am using them together is so I can control 7 RGBW NeoPixels. All the Trinket will be doing is changing the NeoPixels' colors according to commands it gets from the Pi though the serial.

[adafruit_support_carter]

This should be doable. The 5V pin on the Pi is basically the same as the 5V input power. They are not directly tied together, it goes through a fuse and protection diode first. The max current output varies amongst the Pi models, but is something like 2.5A for the Pi 3. What model Pi are you using?

Also, the power supply itself must be able to produce the required current for everything, and the USB cable needs to be good enough quality to deliver the current.