zephyr: gpio/flash: Allow constructor to be unused

Prevents a warning on boards where there are no gpios or flash
controllers are defined.

Signed-off-by: David Brown <[email protected]>

Author: d3zd3z

zephyr/src/device/flash.rs

@@ -16,6 +16,7 @@ pub struct FlashController {
 
 impl FlashController {
     /// Constructor, intended to be called by devicetree generated code.
+    #[allow(dead_code)]
     pub(crate) unsafe fn new(unique: &Unique, device: *const raw::device) -> Option<FlashController> {
         if !unique.once() {
             return None;
@@ -40,6 +41,7 @@ pub struct FlashPartition {
 
 impl FlashPartition {
     /// Constructor, intended to be called by devicetree generated code.
+    #[allow(dead_code)]
     pub(crate) unsafe fn new(unique: &Unique, device: *const raw::device, offset: u32, size: u32) -> Option<FlashPartition> {
         if !unique.once() {
             return None;

zephyr/src/device/gpio.rs

@@ -72,8 +72,7 @@ pub struct GpioPin {
 
 impl GpioPin {
     /// Constructor, used by the devicetree generated code.
-    ///
-    /// TODO: Guarantee single instancing.
+    #[allow(dead_code)]
     pub(crate) unsafe fn new(unique: &Unique, device: *const raw::device, pin: u32, dt_flags: u32) -> Option<GpioPin> {
         if !unique.once() {
             return None;