doc: update README.devices for conn=sn=<serno> (driver specific)

Mention the optional availability of the conn=sn=<serno> format to
select one of several connected devices.

diff --git a/README.devices b/README.devices
index f72b29e7e94a061e69f0fd4b9aceb8fae21d5e32..3e9b631f75f9936708f5505e23499a47eeec0fe9 100644 (file)
--- a/README.devices
+++ b/README.devices
@@ -211,6 +211,12 @@ or VXI communication parameters. See these examples:
  $ sigrok-cli --driver <somedriver>:conn=vxi/<ipaddr> ...
  $ sigrok-cli --driver <somedriver>:conn=usbtmc/<bus>.<addr> ...
 
+Individual device drivers _may_ implement additional semantics for the
+conn= specification, which would not apply to other drivers, yet can be
+rather useful for a given type of device.
+
+ $ sigrok-cli --driver <somedriver>:conn=sn=<serno>
+
 
 Specifying serial port parameters
 ---------------------------------