bcftools selest sites with FILTER “PASS” or “.”

Trying to get site that have a FILTER value of "PASS" or "."

I know of:

bcftools view -f PASS filename.vcf.gz

and

bcftools view -f . filename.vcf.gz

I tried:

bcftools view -f 'PASS | .' filename.vcf.gz

but no dice.

Is it possible to get what I am looking for or do I have to filter separately then concat?