[clkmgr] Support 0 derived clocks

Signed-off-by: Robert Schilling <[email protected]>

Author: Razer6

hw/ip_templates/clkmgr/rtl/clkmgr.sv.tpl

@@ -148,6 +148,7 @@ rg_srcs = get_rg_srcs(typed_clocks)
   );
 
 % endfor
+% if len(derived_clks) > 0:
 
   ////////////////////////////////////////////////////
   // Divided clocks
@@ -161,6 +162,7 @@ rg_srcs = get_rg_srcs(typed_clocks)
 % for src_name in derived_clks:
   logic clk_${src_name};
 % endfor
+% endif
 
 % for src in derived_clks.values():
 
@@ -261,6 +263,7 @@ rg_srcs = get_rg_srcs(typed_clocks)
       .alert_tx_o    ( alert_tx_o[i] )
     );
   end
+% if len(derived_clks) > 0:
 
   ////////////////////////////////////////////////////
   // Clock bypass request
@@ -292,6 +295,16 @@ rg_srcs = get_rg_srcs(typed_clocks)
     // divider step down controls
     .step_down_acks_i(step_down_acks)
   );
+  % else:
+  // No bypass as there are no derived clocks
+
+  // Read inputs and tie-off outputs
+  logic unused_bypass = ^{lc_clk_byp_req_i, all_clk_byp_ack_i, io_clk_byp_ack_i};
+
+  assign all_clk_byp_req_o               = prim_mubi_pkg::MuBi4False;
+  assign io_clk_byp_req_o                = prim_mubi_pkg::MuBi4False;
+  assign all_clkhi_speed_sel_o_byp_req_o = prim_mubi_pkg::MuBi4False;
+  % endif
 
   ////////////////////////////////////////////////////
   // Feed through clocks