zephyr-build: Simplify dt-yaml syntax

The Serde "tag" rules was being used for enums, which results in enums
being generated in a somewhat awkward format.  Remove this, and change
the syntax of the dt-rust.yaml file to match.  This typically results in
changes like:

    - type: instance
      value:
        raw:
	  type: myself

to be simplified to just:

    - !Instance
      raw: !Myself

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

Author: d3zd3z

dt-rust.yaml

@@ -7,13 +7,10 @@
 # few instances were we can actually just match on a property.
 - name: gpio-controller
   rules:
-  - type: has_prop
-    value: gpio-controller
+    - !HasProp gpio-controller
   actions:
-  - type: instance
-    value:
-      raw:
-        type: myself
+    - !Instance
+      raw: !Myself
       device: crate::device::gpio::Gpio
       static_type: crate::device::gpio::GpioStatic
 
@@ -22,101 +19,79 @@
 # with each gpio.
 - name: gpio-leds
   rules:
-  - type: compatible
-    value:
-      names:
-      - gpio-leds
+    - !Compatible
+      names: [gpio-leds]
       level: 1
   actions:
-  - type: instance
-    value:
-      raw:
-        type: phandle
-        value: gpios
+    - !Instance
+      raw: !Phandle gpios
       device: crate::device::gpio::GpioPin
 
 # Hook up the gpio-keys as gpio pins as well
 - name: gpio-keys
   rules:
-  - type: compatible
-    value:
+    - !Compatible
       names:
-      - gpio-keys
+        - gpio-keys
       level: 1
   actions:
-  - type: instance
-    value:
-      raw:
-        type: phandle
-        value: gpios
+    - !Instance
+      raw: !Phandle gpios
       device: crate::device::gpio::GpioPin
 
 # Flash controllers don't have any particular property to identify them, so we need a list of
 # compatible values that should match.
 - name: flash-controller
   rules:
-  - type: compatible
-    value:
+    - !Compatible
       names:
-      - "nordic,nrf52-flash-controller"
-      - "nordic,nrf51-flash-controller"
-      - "raspberrypi,pico-flash-controller"
-      - "st,stm32g4-flash-controller"
-      - "st,stm32l5-flash-controller"
-      - "zephyr,sim-flash"
+        - "nordic,nrf52-flash-controller"
+        - "nordic,nrf51-flash-controller"
+        - "raspberrypi,pico-flash-controller"
+        - "st,stm32g4-flash-controller"
+        - "st,stm32l5-flash-controller"
+        - "zephyr,sim-flash"
       level: 0
   actions:
-  - type: instance
-    value:
-      raw:
-        type: myself
+    - !Instance
+      raw: !Myself
       device: crate::device::flash::FlashController
 
 # Flash partitions exist as children of a node compatible with "soc-nv-flash" that itself is a child
 # of the controller itself.
 # TODO: Get the write and erase property from the DT if present.
 - name: flash-partition
   rules:
-  - type: compatible
-    value:
+    - !Compatible
       names:
-      - "fixed-partitions"
+        - "fixed-partitions"
       level: 1
-  - type: compatible
-    value:
+    - !Compatible
       names:
-      - "soc-nv-flash"
+        - "soc-nv-flash"
       level: 2
   actions:
-  - type: instance
-    value:
-      raw:
-        type: parent
-        value:
-          level: 3
-          args:
-          - type: reg
+    - !Instance
+      raw: !Parent
+        level: 3
+        args:
+          - !Reg
       device: "crate::device::flash::FlashPartition"
 
 # I2C.
 - name: i2c
   rules:
-    - type: compatible
-      value:
-        names:
-          - "snps,designware-i2c"
-        level: 0
+    - !Compatible
+      names:
+        - "snps,designware-i2c"
+      level: 0
   actions:
-    - type: instance
-      value:
-        raw:
-          type: myself
-        device: crate::device::i2c::I2C
+    - !Instance
+      raw: !Myself
+      device: crate::device::i2c::I2C
 
 # Generate a pseudo node that matches all of the labels across the tree with their nodes.
 - name: labels
-  rules:
-    - type: root
+  rules: !Root
   actions:
-  - type: labels
-
+    - !Labels

zephyr-build/src/devicetree/augment.rs

@@ -81,7 +81,6 @@ impl Augment for Augmentation {
 
 /// A matching rule.
 #[derive(Debug, Serialize, Deserialize)]
-#[serde(tag = "type", rename_all = "snake_case", content = "value")]
 pub enum Rule {
     /// A set of "or" matches.
     Or(Vec<Rule>),
@@ -127,7 +126,6 @@ fn parent_compatible(node: &Node, names: &[String], level: usize) -> bool {
 
 /// An action to perform
 #[derive(Debug, Serialize, Deserialize)]
-#[serde(tag = "type", rename_all = "snake_case", content = "value")]
 pub enum Action {
     /// Generate an "instance" with a specific device name.
     Instance {
@@ -177,7 +175,6 @@ impl Action {
 }
 
 #[derive(Debug, Serialize, Deserialize)]
-#[serde(tag = "type", rename_all = "snake_case", content = "value")]
 pub enum RawInfo {
     /// Get the raw device directly from this node.
     Myself,
@@ -276,7 +273,6 @@ impl RawInfo {
 ///
 /// At this point, we assume these all come from the current node.
 #[derive(Debug, Serialize, Deserialize)]
-#[serde(tag = "type", rename_all = "snake_case", content = "value")]
 pub enum ArgInfo {
     /// The arguments come from a 'reg' property.
     Reg,