diff --git a/src/transform/add_peripherals.rs b/src/transform/add_peripherals.rs
new file mode 100644
index 0000000..9aeece6
--- /dev/null
+++ b/src/transform/add_peripherals.rs
@@ -0,0 +1,20 @@
+use serde::{Deserialize, Serialize};
+
+use super::common::*;
+use crate::ir::*;
+
+#[derive(Debug, Serialize, Deserialize)]
+pub struct AddPeripherals {
+    pub devices: RegexSet,
+    pub peripherals: Vec<Peripheral>,
+}
+
+impl AddPeripherals {
+    pub fn run(&self, ir: &mut IR) -> anyhow::Result<()> {
+        for id in match_all(ir.devices.keys().cloned(), &self.devices) {
+            let d = ir.devices.get_mut(&id).unwrap();
+            d.peripherals.extend(self.peripherals.clone());
+        }
+        Ok(())
+    }
+}
diff --git a/src/transform/mod.rs b/src/transform/mod.rs
index e616fcf..7b5f19c 100644
--- a/src/transform/mod.rs
+++ b/src/transform/mod.rs
@@ -241,6 +241,7 @@ transforms!(
     add_fields::AddFields,
     add_registers::AddRegisters,
     add_interrupts::AddInterrupts,
+    add_peripherals::AddPeripherals,
     delete::Delete,
     delete_enum_variants::DeleteEnumVariants,
     delete_enums::DeleteEnums,