Adds the reset field to a Register

Registers commonly have reset values and it can be useful to know what
these are when generating code for them. In the case of the wm8960 I
actually inspect the IR and generate a default array (as the device has
no ability to read back register over i2c) that is stored in memory.

It's entirely optional and unused currently by generators (but certainly
could be!)

Author: SpinFast

src/ir.rs

@@ -123,7 +123,10 @@ pub struct Register {
     pub bit_size: u32,
     #[serde(default, skip_serializing_if = "Option::is_none")]
     pub fieldset: Option<String>,
+    #[serde(default, skip_serializing_if = "is_0")]
+    pub reset: u32,
 }
+
 #[derive(Clone, Debug, PartialEq, Serialize, Deserialize)]
 pub struct BlockItemBlock {
     pub block: String,
@@ -184,7 +187,9 @@ fn default_32() -> u32 {
 fn is_32(x: &u32) -> bool {
     *x == 32
 }
-
+fn is_0(x: &u32) -> bool {
+    *x == 0
+}
 fn default_readwrite() -> Access {
     Access::ReadWrite
 }

src/svd2ir.rs

@@ -214,6 +214,7 @@ pub fn convert_peripheral(ir: &mut IR, p: &svd::Peripheral) -> anyhow::Result<()
                             access, // todo
                             bit_size: r.properties.size.unwrap_or(32),
                             fieldset: fieldset_name.clone(),
+                            reset: 0,
                         }),
                     };