pdn: add check_only flag

Signed-off-by: Peter Gadfort <[email protected]>

Author: gadfort

src/pdn/README.md

@@ -21,6 +21,7 @@ Build a power grid in accordance with the information specified.
 
 ```tcl
 pdngen
+    [-check_only]
     [-dont_add_pins]
     [-failed_via_report file]
     [-report_only]
@@ -36,6 +37,7 @@ pdngen
 | `[-dont_add_pins]` | Prevent the creation of block pins. |
 | `[-failed_via_report]` | Generate a report file which can be viewed in the DRC viewer for all the failed vias (ie. those that did not get built or were removed). |
 | `[-report_only]` | Print the current specifications. |
+| `[-check_only]` | Check the current setup for errors. |
 | `[-reset]` | Reset the grid and domain specifications. |
 | `[-ripup]` | Ripup the existing power grid, as specified by the voltage domains. |
 | `[-skip_trim]` | Skip the metal trim step, which attempts to remove metal stubs. |

src/pdn/src/pdn.tcl

@@ -6,13 +6,15 @@ sta::define_cmd_args "pdngen" {[-skip_trim] \
                                [-reset] \
                                [-ripup] \
                                [-report_only] \
+                               [-check_only] \
                                [-failed_via_report file] \
                                [-verbose]
 } ;#checker off
 
 proc pdngen { args } {
   sta::parse_key_args "pdngen" args \
-    keys {-failed_via_report} flags {-skip_trim -dont_add_pins -reset -ripup -report_only -verbose}
+    keys {-failed_via_report} \
+    flags {-skip_trim -dont_add_pins -reset -ripup -report_only -verbose -check_only}
 
   sta::check_argc_eq0 "pdngen" $args
 
@@ -43,6 +45,13 @@ proc pdngen { args } {
     pdn::report
     return
   }
+  if { [info exists flags(-check_only)] } {
+    if { [array size flags] != 1 } {
+      utl::error PDN 1040 "-check_only flag is mutually exclusive to all other flags"
+    }
+    pdn::check_setup
+    return
+  }
 
   set trim [expr [info exists flags(-skip_trim)] == 0]
   set add_pins [expr [info exists flags(-dont_add_pins)] == 0]