systemd files to enable SPI on startup on a C.H.I.P.

enable_spi.service

# Contributed to public domain by Marc-Antoine Ruel. No rights reserved.

[Unit]
Description=Enable SPI on C.H.I.P.

[Service]
Type=oneshot
ExecStart=/bin/sh -c 'mkdir -p /sys/kernel/config/device-tree/overlays/spi; cat /lib/firmware/nextthingco/chip/sample-spi.dtbo > /sys/kernel/config/device-tree/overlays/spi/dtbo'

enable_spi.timer

# Contributed to public domain by Marc-Antoine Ruel. No rights reserved.

[Unit]
Description=Enable SPI on C.H.I.P. upon boot

[Timer]
OnBootSec=1s
AccuracySec=1s

[Install]
WantedBy=timers.target

Instructions

- Create the two files enable_spi.service and enable_spi.timer in /etc/systemd/system/
- Run the following:

sudo systemctl daemon-reload
sudo systemctl enable enable_spi.timer
sudo systemctl start enable_spi

/dev/spidev32766.0 should now be visible.