Fixed value registers should still contain the fields in its struct.

[trembel]

Look at example below. Problem: you can not compare to Version::default(), although it exists :S

/// `VERSION` Register
///
/// Address: 0x7F
///
/// Reset Value: 0x41
///
/// Holds the version number of the IC, currently 0x41.
///
/// Fixed bits:
/// - `[7:0]` = 0b1000001
#[derive(Debug, PartialEq)]
pub struct Version {
}

/// Register Properties
impl Register<1, u8> for Version {
    const ADDRESS: u8 = 0x7F;
    const RESET_VAL: Option<ResetVal<1>> = Some(ResetVal::LittleEndian([0x41]));
}

/// Reset Value
impl Default for Version {
    fn default() -> Self {
        Self {
        }
    }
}

[trembel]

The biggest IMO with the current solution, is that it's unclear what default does; Although somehow I expect it to populate the struct with the default values - which does not really exist.