DellEMC S6100 CPLD upgrade support (#3834)

* DelllEMC S6100 CPLD upgrade support

* Typo: CPLD

device/dell/x86_64-dell_s6100_c2538-r0/platform_reboot

@@ -0,0 +1,32 @@
+#!/usr/bin/python
+import sys
+import os
+import struct
+
+PORT_RES = '/dev/port'
+POWER_CYCLE = '/tmp/powercycle'
+
+
+def portio_reg_write(resource, offset, val):
+    fd = os.open(resource, os.O_RDWR)
+    if(fd < 0):
+        print 'file open failed %s" % resource'
+        return
+    if(os.lseek(fd, offset, os.SEEK_SET) != offset):
+        print 'lseek failed on %s' % resource
+        return
+    ret = os.write(fd, struct.pack('B', val))
+    if(ret != 1):
+        print 'write failed %d' % ret
+        return
+    os.close(fd)
+
+if __name__ == "__main__":
+    
+    # power-cycle the switch
+    if os.path.exists(POWER_CYCLE):
+        print "CPLD upgrade detected. Power-cycling the unit.."
+        os.system('io_rd_wr.py  --set --val 05 --offset 210; io_rd_wr.py  --set --val 00 --offset 211; io_rd_wr.py  --set --val 03 --offset 213')
+
+    portio_reg_write(PORT_RES, 0xcf9, 0xe)
+

platform/broadcom/sonic-platform-modules-dell/debian/platform-modules-s6100.install

@@ -4,7 +4,6 @@ common/dell_i2c_utils.sh usr/local/bin
 common/io_rd_wr.py usr/local/bin
 common/fstrim.timer etc/systemd/system
 common/fstrim.service etc/systemd/system
-common/platform_reboot usr/share/sonic/device/x86_64-dell_s6100_c2538-r0
 s6100/scripts/platform_sensors.py usr/local/bin
 s6100/scripts/sensors usr/bin
 s6100/systemd/platform-modules-s6100.service etc/systemd/system