.pins files to be run by pintosym.pl
      to make Makefiles work as expected, there needs to be a
      <file>.sym file for every <file>.pins file
.inc  files designed to be included from .pins files

<mcu family>.pins is the main pins file for that family
<mcu family>.inc  contains common data for that family

 the convention I use is:
<prefix>_comm_uart.inc	serial ports like rs232
<prefix>_comm_i2c.inc	i2c bus ports
<prefix>_comm_can.inc	can bus ports
<prefix>_comm_lin.inc	lin bus port
<prefix>_comm_mii.inc	ethernet  mii interface
<prefix>_comm_rmii.inc	ethernet rmii interface

In contrast to that I use a subsheet for mcu general power and one for
the jtag if since that is expected to stay the same over a few
designs. For the power you can use ic_power.sym and for the jtag/debug
if. use source.sym.