diff --git a/doc/guides/dts/macros.bnf b/doc/guides/dts/macros.bnf
index 2af99c062b1..2b9e1dd9106 100644
--- a/doc/guides/dts/macros.bnf
+++ b/doc/guides/dts/macros.bnf
@@ -27,12 +27,14 @@ node-macro =/ %s"DT_N" path-id %s"_EXISTS"
 node-macro =/ %s"DT_N" path-id %s"_BUS" ["_" dt-name]
 ; The reg property is special and has its own macros.
 node-macro =/ %s"DT_N" path-id %s"_REG_NUM"
+node-macro =/ %s"DT_N" path-id %s"_REG_IDX_" DIGIT "_EXISTS"
 node-macro =/ %s"DT_N" path-id %s"_REG_IDX_" DIGIT
               %s"_VAL_" ( %s"ADDRESS" / %s"SIZE")
 node-macro =/ %s"DT_N" path-id %s"_REG_NAME_" dt-name
               %s"_VAL_" ( %s"ADDRESS" / %s"SIZE")
 ; The interrupts property is also special.
 node-macro =/ %s"DT_N" path-id %s"_IRQ_NUM"
+node-macro =/ %s"DT_N" path-id %s"_IRQ_IDX_" DIGIT "_EXISTS"
 node-macro =/ %s"DT_N" path-id %s"_IRQ_IDX_" DIGIT
               %s"_VAL_" dt-name [ %s"_EXISTS" ]
 node-macro =/ %s"DT_N" path-id %s"_IRQ_NAME_" dt-name
diff --git a/scripts/dts/gen_defines.py b/scripts/dts/gen_defines.py
index bc544c6f9c8..a5ef1f3d21e 100755
--- a/scripts/dts/gen_defines.py
+++ b/scripts/dts/gen_defines.py
@@ -239,6 +239,7 @@ def write_regs(node):
         idx_vals.append((f"{path_id}_REG_NUM", len(node.regs)))
 
     for i, reg in enumerate(node.regs):
+        idx_vals.append((f"{path_id}_REG_IDX_{i}_EXISTS", 1))
         if reg.addr is not None:
             idx_macro = f"{path_id}_REG_IDX_{i}_VAL_ADDRESS"
             idx_vals.append((idx_macro,
@@ -312,6 +313,7 @@ def write_interrupts(node):
                     cell_value = map_arm_gic_irq_type(irq, cell_value)
                 cell_value = encode_zephyr_multi_level_irq(irq, cell_value)
 
+            idx_vals.append((f"{path_id}_IRQ_IDX_{i}_EXISTS", 1))
             idx_macro = f"{path_id}_IRQ_IDX_{i}_VAL_{name}"
             idx_vals.append((idx_macro, cell_value))
             idx_vals.append((idx_macro + "_EXISTS", 1))