diff --git a/esp-hal/src/gpio/lp_io.rs b/esp-hal/src/gpio/lp_io.rs
index a48deb6dc53..d9d887b9a09 100644
--- a/esp-hal/src/gpio/lp_io.rs
+++ b/esp-hal/src/gpio/lp_io.rs
@@ -248,6 +248,10 @@ macro_rules! lp_gpio {
                         });
                     }
                 }
+
+                fn functions(&self, _: crate::private::Internal) -> &'static [$crate::gpio::RtcFunction] {
+                    &[$crate::gpio::RtcFunction::_0, $crate::gpio::RtcFunction::_1, /* macros hard :'( */]
+                }
             }
 
             #[cfg_attr(docsrs, doc(cfg(feature = "unstable")))]
diff --git a/esp-hal/src/gpio/mod.rs b/esp-hal/src/gpio/mod.rs
index 3f423181bc2..6a8b9f989b0 100644
--- a/esp-hal/src/gpio/mod.rs
+++ b/esp-hal/src/gpio/mod.rs
@@ -353,13 +353,24 @@ impl TryFrom<usize> for AlternateFunction {
 #[cfg_attr(feature = "defmt", derive(defmt::Format))]
 #[cfg(not(esp32h2))]
 pub enum RtcFunction {
+    /// Rtc function 0.
+    _0 = 0,
+    /// Rtc function 1.
+    _1 = 1,
+    /// Rtc function 2.
+    _2 = 2,
+    /// Rtc function 3.
+    _3 = 3,
+}
+
+#[cfg(not(esp32h2))]
+impl RtcFunction {
     /// RTC mode.
-    Rtc     = 0,
+    pub const RTC: Self = Self::_0;
+
+    #[allow(unused)]
     /// Digital mode.
-    Digital = 1,
-    /// RTC_I2C mode.
-    #[cfg(soc_has_rtc_i2c)]
-    I2c     = 3,
+    pub const DIGITAL: Self = Self::_1;
 }
 
 /// Trait implemented by RTC pins
@@ -379,6 +390,10 @@ pub trait RtcPin: Pin {
     #[doc(hidden)]
     fn rtcio_pad_hold(&self, enable: bool);
 
+    #[cfg(any(xtensa, esp32c6))]
+    #[doc(hidden)]
+    fn functions(&self, _: private::Internal) -> &'static [RtcFunction];
+
     /// # Safety
     ///
     /// The `level` argument needs to be a valid setting for the
@@ -2283,6 +2298,13 @@ impl RtcPin for AnyPin<'_> {
         }
     }
 
+    #[cfg(any(xtensa, esp32c6))]
+    fn functions(&self, i: private::Internal) -> &'static [RtcFunction] {
+        for_each_rtcio_pin! {
+            (self, target) => { RtcPin::functions(&target, i) };
+        }
+    }
+
     #[cfg(any(esp32c2, esp32c3, esp32c6))]
     unsafe fn apply_wakeup(&self, wakeup: bool, level: u8) {
         for_each_rtcio_pin! {
diff --git a/esp-hal/src/gpio/rtc_io.rs b/esp-hal/src/gpio/rtc_io.rs
index 084f5236a5b..dca74876547 100644
--- a/esp-hal/src/gpio/rtc_io.rs
+++ b/esp-hal/src/gpio/rtc_io.rs
@@ -48,7 +48,7 @@ impl<'d, const PIN: u8> LowPowerOutput<'d, PIN> {
     where
         P: OutputPin + RtcPin + 'd,
     {
-        pin.rtc_set_config(false, true, RtcFunction::Rtc);
+        pin.rtc_set_config(false, true, RtcFunction::RTC);
 
         let this = Self {
             phantom: PhantomData,
@@ -84,7 +84,7 @@ impl<'d, const PIN: u8> LowPowerInput<'d, PIN> {
     where
         P: InputPin + RtcPin + 'd,
     {
-        pin.rtc_set_config(true, true, RtcFunction::Rtc);
+        pin.rtc_set_config(true, true, RtcFunction::RTC);
 
         let this = Self {
             phantom: PhantomData,
@@ -128,7 +128,7 @@ impl<'d, const PIN: u8> LowPowerOutputOpenDrain<'d, PIN> {
     where
         P: InputPin + OutputPin + RtcPin + 'd,
     {
-        pin.rtc_set_config(true, true, RtcFunction::Rtc);
+        pin.rtc_set_config(true, true, RtcFunction::RTC);
 
         let this = Self {
             phantom: PhantomData,
diff --git a/esp-hal/src/i2c/rtc.rs b/esp-hal/src/i2c/rtc.rs
index 7fc70be52d4..be51c0f78dd 100644
--- a/esp-hal/src/i2c/rtc.rs
+++ b/esp-hal/src/i2c/rtc.rs
@@ -88,12 +88,18 @@ const RC_FAST_CLK: u32 = property!("soc.rc_fast_clk_default");
 pub trait Sda: RtcPin + OutputPin + InputPin {
     #[doc(hidden)]
     fn selector(&self) -> u8;
+
+    #[doc(hidden)]
+    fn function(&self) -> RtcFunction;
 }
 
 /// Trait representing the RTC_I2C SCL pin.
 pub trait Scl: RtcPin + OutputPin + InputPin {
     #[doc(hidden)]
     fn selector(&self) -> u8;
+
+    #[doc(hidden)]
+    fn function(&self) -> RtcFunction;
 }
 
 for_each_lp_function! {
@@ -102,6 +108,10 @@ for_each_lp_function! {
             fn selector(&self) -> u8 {
                 $n
             }
+
+            fn function(&self) -> RtcFunction {
+                RtcFunction::_3
+            }
         }
     };
     (($_func:ident, SAR_I2C_SDA_n, $n:literal), $gpio:ident) => {
@@ -109,6 +119,10 @@ for_each_lp_function! {
             fn selector(&self) -> u8 {
                 $n
             }
+
+            fn function(&self) -> RtcFunction {
+                RtcFunction::_3
+            }
         }
     };
 }
@@ -182,7 +196,7 @@ impl<'d> I2c<'d> {
             rtc_io
                 .rtc_gpio_enable_w1ts()
                 .write(|w| unsafe { w.rtc_gpio_enable_w1ts().bits(1 << scl.number()) });
-            scl.rtc_set_config(true, true, RtcFunction::I2c);
+            scl.rtc_set_config(true, true, scl.function());
         }
 
         {
@@ -194,7 +208,7 @@ impl<'d> I2c<'d> {
             rtc_io
                 .rtc_gpio_enable_w1ts()
                 .write(|w| unsafe { w.rtc_gpio_enable_w1ts().bits(1 << sda.number()) });
-            sda.rtc_set_config(true, true, RtcFunction::I2c);
+            sda.rtc_set_config(true, true, sda.function());
         }
 
         rtc_io.sar_i2c_io().write(|w| unsafe {
diff --git a/esp-hal/src/rtc_cntl/sleep/esp32.rs b/esp-hal/src/rtc_cntl/sleep/esp32.rs
index e696b125e67..516746984bc 100644
--- a/esp-hal/src/rtc_cntl/sleep/esp32.rs
+++ b/esp-hal/src/rtc_cntl/sleep/esp32.rs
@@ -113,7 +113,7 @@ impl<P: RtcPin> WakeSource for Ext0WakeupSource<P> {
         // set pin to RTC function
         self.pin
             .borrow_mut()
-            .rtc_set_config(true, true, RtcFunction::Rtc);
+            .rtc_set_config(true, true, RtcFunction::RTC);
 
         unsafe {
             // set pin register field
@@ -135,7 +135,7 @@ impl<P: RtcPin> Drop for Ext0WakeupSource<P> {
         // to IO_MUX)
         self.pin
             .borrow_mut()
-            .rtc_set_config(true, false, RtcFunction::Rtc);
+            .rtc_set_config(true, false, RtcFunction::RTC);
     }
 }
 
@@ -154,7 +154,7 @@ impl WakeSource for Ext1WakeupSource<'_, '_> {
         let mut pins = self.pins.borrow_mut();
         let mut bits = 0u32;
         for pin in pins.iter_mut() {
-            pin.rtc_set_config(true, true, RtcFunction::Rtc);
+            pin.rtc_set_config(true, true, RtcFunction::RTC);
             bits |= 1 << pin.rtc_number();
         }
 
@@ -182,7 +182,7 @@ impl Drop for Ext1WakeupSource<'_, '_> {
         // to IO_MUX)
         let mut pins = self.pins.borrow_mut();
         for pin in pins.iter_mut() {
-            pin.rtc_set_config(true, false, RtcFunction::Rtc);
+            pin.rtc_set_config(true, false, RtcFunction::RTC);
         }
     }
 }
diff --git a/esp-hal/src/rtc_cntl/sleep/esp32c2.rs b/esp-hal/src/rtc_cntl/sleep/esp32c2.rs
index 602a88bb248..2df4af312f0 100644
--- a/esp-hal/src/rtc_cntl/sleep/esp32c2.rs
+++ b/esp-hal/src/rtc_cntl/sleep/esp32c2.rs
@@ -179,7 +179,7 @@ fn isolate_digital_gpio() {
             // make pad work as gpio (otherwise, deep_sleep bottom current will rise)
             io_mux
                 .gpio(pin_num)
-                .modify(|_, w| unsafe { w.mcu_sel().bits(RtcFunction::Digital as u8) });
+                .modify(|_, w| unsafe { w.mcu_sel().bits(RtcFunction::DIGITAL as u8) });
         }
     }
 }
@@ -249,7 +249,7 @@ impl WakeSource for RtcioWakeupSource<'_, '_> {
 // to IO_MUX)
 // let mut pins = self.pins.borrow_mut();
 // for (pin, _level) in pins.iter_mut() {
-// pin.rtc_set_config(true, false, RtcFunction::Rtc);
+// pin.rtc_set_config(true, false, RtcFunction::RTC);
 // }
 // }
 // }
diff --git a/esp-hal/src/rtc_cntl/sleep/esp32c3.rs b/esp-hal/src/rtc_cntl/sleep/esp32c3.rs
index 4d3f0dbf4ee..e6e4c248b5f 100644
--- a/esp-hal/src/rtc_cntl/sleep/esp32c3.rs
+++ b/esp-hal/src/rtc_cntl/sleep/esp32c3.rs
@@ -180,7 +180,7 @@ fn isolate_digital_gpio() {
             // make pad work as gpio (otherwise, deep_sleep bottom current will rise)
             io_mux
                 .gpio(pin_num)
-                .modify(|_, w| unsafe { w.mcu_sel().bits(RtcFunction::Digital as u8) });
+                .modify(|_, w| unsafe { w.mcu_sel().bits(RtcFunction::DIGITAL as u8) });
         }
     }
 }
@@ -250,7 +250,7 @@ impl WakeSource for RtcioWakeupSource<'_, '_> {
 // to IO_MUX)
 // let mut pins = self.pins.borrow_mut();
 // for (pin, _level) in pins.iter_mut() {
-// pin.rtc_set_config(true, false, RtcFunction::Rtc);
+// pin.rtc_set_config(true, false, RtcFunction::RTC);
 // }
 // }
 // }
diff --git a/esp-hal/src/rtc_cntl/sleep/esp32c6.rs b/esp-hal/src/rtc_cntl/sleep/esp32c6.rs
index b5873212475..39285c91093 100644
--- a/esp-hal/src/rtc_cntl/sleep/esp32c6.rs
+++ b/esp-hal/src/rtc_cntl/sleep/esp32c6.rs
@@ -77,7 +77,7 @@ impl Ext1WakeupSource<'_, '_> {
         fn uninit_pin(pin: impl RtcPin, wakeup_pins: u8) {
             if wakeup_pins & (1 << pin.number()) != 0 {
                 pin.rtcio_pad_hold(false);
-                pin.rtc_set_config(false, false, RtcFunction::Rtc);
+                pin.rtc_set_config(false, false, RtcFunction::RTC);
             }
         }
 
@@ -114,7 +114,7 @@ impl WakeSource for Ext1WakeupSource<'_, '_> {
                 WakeupLevel::Low => 0,
             };
 
-            pin.rtc_set_config(true, true, RtcFunction::Rtc);
+            pin.rtc_set_config(true, true, RtcFunction::RTC);
             pin.rtcio_pad_hold(true);
         }
 
@@ -142,7 +142,7 @@ impl Drop for Ext1WakeupSource<'_, '_> {
         // to IO_MUX)
         let mut pins = self.pins.borrow_mut();
         for (pin, _level) in pins.iter_mut() {
-            pin.rtc_set_config(true, false, RtcFunction::Rtc);
+            pin.rtc_set_config(true, false, RtcFunction::RTC);
         }
     }
 }
diff --git a/esp-hal/src/rtc_cntl/sleep/esp32s2.rs b/esp-hal/src/rtc_cntl/sleep/esp32s2.rs
index e721d2780c4..a220510c0c5 100644
--- a/esp-hal/src/rtc_cntl/sleep/esp32s2.rs
+++ b/esp-hal/src/rtc_cntl/sleep/esp32s2.rs
@@ -125,7 +125,7 @@ impl<P: RtcPin> WakeSource for Ext0WakeupSource<P> {
         // set pin to RTC function
         self.pin
             .borrow_mut()
-            .rtc_set_config(true, true, RtcFunction::Rtc);
+            .rtc_set_config(true, true, RtcFunction::RTC);
 
         // rtcio_hal_ext0_set_wakeup_pin
         unsafe {
@@ -150,7 +150,7 @@ impl<P: RtcPin> Drop for Ext0WakeupSource<P> {
         // to IO_MUX)
         self.pin
             .borrow_mut()
-            .rtc_set_config(true, false, RtcFunction::Rtc);
+            .rtc_set_config(true, false, RtcFunction::RTC);
     }
 }
 
@@ -172,7 +172,7 @@ impl WakeSource for Ext1WakeupSource<'_, '_> {
         let mut pins = self.pins.borrow_mut();
         let mut bits = 0u32;
         for pin in pins.iter_mut() {
-            pin.rtc_set_config(true, true, RtcFunction::Rtc);
+            pin.rtc_set_config(true, true, RtcFunction::RTC);
             pin.rtcio_pad_hold(true);
             bits |= 1 << pin.rtc_number();
         }
@@ -200,7 +200,7 @@ impl Drop for Ext1WakeupSource<'_, '_> {
         // to IO_MUX)
         let mut pins = self.pins.borrow_mut();
         for pin in pins.iter_mut() {
-            pin.rtc_set_config(true, false, RtcFunction::Rtc);
+            pin.rtc_set_config(true, false, RtcFunction::RTC);
         }
     }
 }
@@ -209,7 +209,7 @@ impl RtcioWakeupSource<'_, '_> {
     fn apply_pin(&self, pin: &mut dyn RtcPin, level: WakeupLevel) {
         let rtcio = RTC_IO::regs();
 
-        pin.rtc_set_config(true, true, RtcFunction::Rtc);
+        pin.rtc_set_config(true, true, RtcFunction::RTC);
 
         rtcio.pin(pin.number() as usize).modify(|_, w| unsafe {
             w.gpio_pin_wakeup_enable().set_bit();
@@ -258,7 +258,7 @@ impl Drop for RtcioWakeupSource<'_, '_> {
         // to IO_MUX)
         let mut pins = self.pins.borrow_mut();
         for (pin, _level) in pins.iter_mut() {
-            pin.rtc_set_config(true, false, RtcFunction::Rtc);
+            pin.rtc_set_config(true, false, RtcFunction::RTC);
         }
     }
 }
diff --git a/esp-hal/src/rtc_cntl/sleep/esp32s3.rs b/esp-hal/src/rtc_cntl/sleep/esp32s3.rs
index 294078027ff..b4a7b2cacb4 100644
--- a/esp-hal/src/rtc_cntl/sleep/esp32s3.rs
+++ b/esp-hal/src/rtc_cntl/sleep/esp32s3.rs
@@ -129,7 +129,7 @@ impl<P: RtcPin> WakeSource for Ext0WakeupSource<P> {
         // set pin to RTC function
         self.pin
             .borrow_mut()
-            .rtc_set_config(true, true, RtcFunction::Rtc);
+            .rtc_set_config(true, true, RtcFunction::RTC);
 
         unsafe {
             let rtc_io = RTC_IO::regs();
@@ -153,7 +153,7 @@ impl<P: RtcPin> Drop for Ext0WakeupSource<P> {
         // to IO_MUX)
         self.pin
             .borrow_mut()
-            .rtc_set_config(true, false, RtcFunction::Rtc);
+            .rtc_set_config(true, false, RtcFunction::RTC);
     }
 }
 
@@ -172,7 +172,7 @@ impl WakeSource for Ext1WakeupSource<'_, '_> {
         let mut pins = self.pins.borrow_mut();
         let mut bits = 0u32;
         for pin in pins.iter_mut() {
-            pin.rtc_set_config(true, true, RtcFunction::Rtc);
+            pin.rtc_set_config(true, true, RtcFunction::RTC);
             bits |= 1 << pin.rtc_number();
         }
 
@@ -201,7 +201,7 @@ impl Drop for Ext1WakeupSource<'_, '_> {
         // to IO_MUX)
         let mut pins = self.pins.borrow_mut();
         for pin in pins.iter_mut() {
-            pin.rtc_set_config(true, false, RtcFunction::Rtc);
+            pin.rtc_set_config(true, false, RtcFunction::RTC);
         }
     }
 }
@@ -210,7 +210,7 @@ impl RtcioWakeupSource<'_, '_> {
     fn apply_pin(&self, pin: &mut dyn RtcPin, level: WakeupLevel) {
         let rtcio = RTC_IO::regs();
 
-        pin.rtc_set_config(true, true, RtcFunction::Rtc);
+        pin.rtc_set_config(true, true, RtcFunction::RTC);
 
         rtcio.pin(pin.number() as usize).modify(|_, w| unsafe {
             w.wakeup_enable().set_bit().int_type().bits(match level {
@@ -258,7 +258,7 @@ impl Drop for RtcioWakeupSource<'_, '_> {
         // to IO_MUX)
         let mut pins = self.pins.borrow_mut();
         for (pin, _level) in pins.iter_mut() {
-            pin.rtc_set_config(true, false, RtcFunction::Rtc);
+            pin.rtc_set_config(true, false, RtcFunction::RTC);
         }
     }
 }
diff --git a/esp-hal/src/soc/esp32/gpio.rs b/esp-hal/src/soc/esp32/gpio.rs
index 3c0d51a2449..d41e397c1b7 100644
--- a/esp-hal/src/soc/esp32/gpio.rs
+++ b/esp-hal/src/soc/esp32/gpio.rs
@@ -54,6 +54,10 @@ macro_rules! rtcio_analog {
                         .hold_force()
                         .modify(|_, w| w.$hold().bit(enable));
                 }
+
+                fn functions(&self, _: crate::private::Internal) -> &'static [$crate::gpio::RtcFunction] {
+                    &[$crate::gpio::RtcFunction::_0, $crate::gpio::RtcFunction::_1, /* macros hard :'( */]
+                }
             }
 
             for_each_gpio! {
diff --git a/esp-hal/src/soc/esp32s2/gpio.rs b/esp-hal/src/soc/esp32s2/gpio.rs
index 410d468a9f7..42ef661de21 100644
--- a/esp-hal/src/soc/esp32s2/gpio.rs
+++ b/esp-hal/src/soc/esp32s2/gpio.rs
@@ -114,6 +114,10 @@ for_each_lp_function! {
                     .pad_hold()
                     .modify(|_, w| hold_field!(w, $gpio).bit(enable));
             }
+
+            fn functions(&self, _: crate::private::Internal) -> &'static [$crate::gpio::RtcFunction] {
+                &[$crate::gpio::RtcFunction::_0, $crate::gpio::RtcFunction::_1, /* macros hard :'( */]
+            }
         }
 
         #[cfg_attr(docsrs, doc(cfg(feature = "unstable")))]
diff --git a/esp-hal/src/soc/esp32s3/gpio.rs b/esp-hal/src/soc/esp32s3/gpio.rs
index 75b24996317..1cafa78ea9b 100644
--- a/esp-hal/src/soc/esp32s3/gpio.rs
+++ b/esp-hal/src/soc/esp32s3/gpio.rs
@@ -55,6 +55,10 @@ macro_rules! rtcio_analog {
                         .pad_hold()
                         .modify(|_, w| w.$hold().bit(enable));
                 }
+
+                fn functions(&self, _: crate::private::Internal) -> &'static [$crate::gpio::RtcFunction] {
+                    &[$crate::gpio::RtcFunction::_0, $crate::gpio::RtcFunction::_1, /* macros hard :'( */]
+                }
             }
 
             #[cfg_attr(docsrs, doc(cfg(feature = "unstable")))]