tree c4a8ffdb1e0f2c23f4899078ba1a7153b537a16f
parent cbfef6e40a030a7e99c8bba49482ac53f05b803b
author Tom Tsou <tom.tsou@ettus.com> 1468808948 -0700
committer Tom Tsou <tom.tsou@ettus.com> 1468809262 -0700

uhd: Add command line option for GPS reference

Unlike earlier versions of UHD, the current release (3.9.2)
does not automatically select on-board GPSDO as the reference
source. Modify the command line settings to allow explicit
selection of GPS in addition to the external setting.

Simultaneous GPS and external reference settingis disallowed.

Signed-off-by: Tom Tsou <tom.tsou@ettus.com>