This patch adds a function to query UART settings in an unintrusive way. It can be used using a uart index or a devpath and it strives to just read out the settings without affecting the state of the UART. Signed-off-by: Tapani Utriainen <tapani@technexion.com> Signed-off-by: Brendan Le Foll <brendan.le.foll@intel.com>