Re: [PATCH v2 2/4] rust: nvmem: Add an abstraction for nvmem providers

+impl Device {
+    /// Register a managed nvmem provider on the given device.
+    pub fn nvmem_register<T>(&self, mut config: NvmemConfig<T>, priv_: &T::Priv)
+    where
+        T: NvmemProvider + Default,
+    {
+        // FIXME: The last cast to mut indicates some unsoundness here.
+        config.inner.priv_ = core::ptr::from_ref(priv_).cast::<c_void>().cast_mut();
+        config.inner.dev = self.as_raw();
+        config.inner.reg_read = Some(NvmemConfig::<T>::reg_read);
+        config.inner.reg_write = Some(NvmemConfig::<T>::reg_write);
+        // SAFETY: Both self and config can’t be null here, and should have the correct type.
+        unsafe { bindings::devm_nvmem_register(self.as_raw(), &config.inner) };
+    }
+}