diff --git a/src/enumeration.rs b/src/enumeration.rs
index c5e48c0..e3b59ba 100644
--- a/src/enumeration.rs
+++ b/src/enumeration.rs
@@ -465,20 +465,9 @@ impl UsbControllerType {
             _ => None,
         }
     }
-
-    #[allow(dead_code)] // not used on all platforms
-    pub(crate) fn from_bcd(bcd: u16) -> Option<Self> {
-        match bcd & 0xF00 {
-            0x300 => Some(UsbControllerType::XHCI),
-            0x200 => Some(UsbControllerType::EHCI),
-            // assume open version
-            0x100 => Some(UsbControllerType::OHCI),
-            _ => None,
-        }
-    }
 }
 
-/// Information about a system USB bus. Aims to be a more useful and portable version of the Linux root hub device.
+/// Information about a system USB bus.
 ///
 /// Platform-specific fields:
 /// * Linux: `path`, `parent_path`, `busnum`, `root_hub`
diff --git a/src/platform/macos_iokit/enumeration.rs b/src/platform/macos_iokit/enumeration.rs
index 4fe7919..1f9f850 100644
--- a/src/platform/macos_iokit/enumeration.rs
+++ b/src/platform/macos_iokit/enumeration.rs
@@ -218,11 +218,6 @@ fn get_integer_property(device: &IoService, property: &'static str) -> Option<i6
     })
 }
 
-fn get_byte_array_property(device: &IoService, property: &'static str) -> Option<Vec<u8>> {
-    let d = get_property::<CFData>(device, property)?;
-    Some(d.bytes().to_vec())
-}
-
 fn get_ascii_array_property(device: &IoService, property: &'static str) -> Option<String> {
     let d = get_property::<CFData>(device, property)?;
     Some(