feat(behaviors): Add `&bootloader` behavior.

* Allow reset behavior to have a type property.
* Add `bootloader` node that triggers DFU UF2
  bootloader mode using the AdaFruit nrf52
  bootloader.

app/dts/behaviors/reset.dtsi

@@ -1,3 +1,5 @@
+#include <dt-bindings/zmk/reset.h>
+
 / {
 	behaviors {
 		reset: behavior_reset {
@@ -5,5 +7,12 @@
 			label = "RESET";
 			#binding-cells = <0>;
 		};
+
+		bootloader: behavior_reset_dfu {
+			compatible = "zmk,behavior-reset";
+			label = "BOOTLOADER_RESET";
+			type = <RST_UF2>;
+			#binding-cells = <0>;
+		};
 	};
 };

app/dts/bindings/behaviors/zmk,behavior-reset.yaml

@@ -6,3 +6,8 @@ description: Keyboard Reset Behavior
 compatible: "zmk,behavior-reset"
 
 include: zero_param.yaml
+
+properties:
+  type:
+    type: int
+    default: 0

app/include/dt-bindings/zmk/reset.h

@@ -0,0 +1,12 @@
+/*
+ * Copyright (c) 2020 Peter Johanson <peter@peterjohanson.com>
+ *
+ * SPDX-License-Identifier: MIT
+ */
+
+#define RST_WARM        0x00
+#define RST_COLD        0x01
+
+// AdaFruit nrf52 Bootloader Specific. See https://github.com/adafruit/Adafruit_nRF52_Bootloader/blob/d6b28e66053eea467166f44875e3c7ec741cb471/src/main.c#L107
+
+#define RST_UF2     0x57

app/src/behaviors/behavior_reset.c

@@ -13,8 +13,9 @@
 
 LOG_MODULE_DECLARE(zmk, CONFIG_ZMK_LOG_LEVEL);
 
-struct behavior_reset_config { };
-struct behavior_reset_data { };
+struct behavior_reset_config {
+  int type;
+};
 
 static int behavior_reset_init(struct device *dev)
 {
@@ -23,9 +24,11 @@ static int behavior_reset_init(struct device *dev)
 
 static int on_keymap_binding_pressed(struct device *dev, u32_t position, u32_t _param1, u32_t _param2)
 {
+  const struct behavior_reset_config *cfg = dev->config_info;
+
   // TODO: Correct magic code for going into DFU?
   // See https://github.com/adafruit/Adafruit_nRF52_Bootloader/blob/d6b28e66053eea467166f44875e3c7ec741cb471/src/main.c#L107
-  sys_reboot(0);
+  sys_reboot(cfg->type);
   return 0;
 }
 
@@ -34,12 +37,14 @@ static const struct behavior_driver_api behavior_reset_driver_api = {
 };
 
 
-static const struct behavior_reset_config behavior_reset_config = {};
-
-static struct behavior_reset_data behavior_reset_data;
-
-DEVICE_AND_API_INIT(behavior_reset, DT_INST_LABEL(0), behavior_reset_init,
-                    &behavior_reset_data,
-                    &behavior_reset_config,
-                    APPLICATION, CONFIG_KERNEL_INIT_PRIORITY_DEFAULT,
-                    &behavior_reset_driver_api);
+#define RST_INST(n) \
+  static const struct behavior_reset_config behavior_reset_config_##n = { \
+    .type = DT_INST_PROP(n, type) \
+  }; \
+  DEVICE_AND_API_INIT(behavior_reset_##n, DT_INST_LABEL(n), behavior_reset_init, \
+                    NULL, \
+                    &behavior_reset_config_##n, \
+                    APPLICATION, CONFIG_KERNEL_INIT_PRIORITY_DEFAULT, \
+                    &behavior_reset_driver_api);
+  
+DT_INST_FOREACH_STATUS_OKAY(RST_INST)

docs/docs/behavior/reset.md

@@ -0,0 +1,43 @@
+---
+title: Reset Behaviors
+sidebar_label: Reset
+---
+
+## Summary
+
+There are two available behaviors that can be used to trigger a reset of the keyboard.
+The first is a soft reset, that will simply reset and re-run the currently flashed
+firmware; the second when triggered will reset into the bootloader, allowing you to
+flash a new firmware to the keyboard.
+
+## Reset
+
+The basic reset behavior will reset the keyboard and re-run the firmware flashed
+to the device
+
+### Behavior Binding
+
+- Reference: `&reset`
+- Parameters: None
+
+Example:
+
+```
+&reset
+```
+
+## Bootloader Reset
+
+The bootloader reset behavior will reset the keyboard and put it into bootloader mode, allowing
+you to flash a new firmware.
+
+### Behavior Binding
+
+- Reference: `&bootloader`
+- Parameters: None
+
+Example:
+
+```
+&bootloader
+```

docs/sidebars.js

@@ -12,6 +12,7 @@ module.exports = {
       "behavior/layers",
       "behavior/misc",
       "behavior/mod-tap",
+      "behavior/reset",
       "behavior/lighting",
     ],
     Development: [