In response to https://github.com/terraform-providers/terraform-provider-linode/issues/7 , this gist offers a one-time static list of Linode Regions, Types, Images, and Kernels.
This list will go stale. Consider using the means discussed in that issue or use the Linode CLI to generate fresh results.
linode-cli --text regions list | tr '\t' '|' > regions.md
linode-cli --text images list | tr '\t' '|' > images.md
linode-cli --text kernels list | tr '\t' '|' > kernels.md
linode-cli --text linodes types | tr '\t' '|' > linode-types.md