11 files changed, 272 insertions, 24 deletions

diff --git a/docs/_summary.md b/docs/_summary.md
index 19498f6a2..8d401bb40 100644
--- a/docs/_summary.md
+++ b/docs/_summary.md
@@ -159,6 +159,7 @@
     * [Contributing to QMK](contributing.md)
     * [Translating the QMK Docs](translating.md)
     * [Config Options](config_options.md)
+    * [Data Driven Configuration](data_driven_config.md)
     * [Make Documentation](getting_started_make_guide.md)
     * [Documentation Best Practices](documentation_best_practices.md)
     * [Documentation Templates](documentation_templates.md)
diff --git a/docs/data_driven_config.md b/docs/data_driven_config.md
new file mode 100644
index 000000000..7e4f23284
--- /dev/null
+++ b/docs/data_driven_config.md
@@ -0,0 +1,59 @@
+# Data Driven Configuration
+
+This page describes how QMK's data driven JSON configuration system works. It is aimed at developers who want to work on QMK itself.
+
+## History
+
+Historically QMK has been configured through a combination of two mechanisms- `rules.mk` and `config.h`. While this worked well when QMK was only a handful of keyboards we've grown to encompass nearly 1500 supported keyboards. That extrapolates out to 6000 configuration files under `keyboards/` alone! The freeform nature of these files and the unique patterns people have used to avoid duplication have made ongoing maintenance a challenge, and a large number of our keyboards follow patterns that are outdated and sometimes harder to understand.
+
+We have also been working on bringing the power of QMK to people who aren't comformable with a CLI, and other projects such as VIA are working to make using QMK as easy as installing a program. These tools need information about how a keyboard is laid out or what pins and features are available so that users can take full advantage of QMK. We introduced `info.json` as a first step towards this. The QMK API is an effort to combine these 3 sources of information- `config.h`, `rules.mk`, and `info.json`- into a single source of truth that end-user tools can use.
+
+Now we have support for generating `rules.mk` and `config.h` values from `info.json`, allowing us to have a single source of truth. This will allow us to use automated tooling to maintain keyboards saving a lot of time and maintenance work.
+
+## Overview
+
+On the C side of things nothing really changes. When you need to create a new rule or define you follow the same process:
+
+1. Add it to `docs/config_options.md`
+1. Set a default in the appropriate core file
+1. Add your `ifdef` and/or `#ifdef` statements as needed
+
+You will then need to add support for your new configuration to `info.json`. The basic process is:
+
+1. Add it to the schema in `data/schemas/keyboards.jsonschema`
+1. Add code to extract it from `config.h`/`rules.mk` to `lib/python/qmk/info.py`
+1. Add code to generate it to one of:
+  * `lib/python/qmk/cli/generate/config_h.py`
+  * `lib/python/qmk/cli/generate/rules_mk.py`
+
+## Adding an option to info.json
+
+This section describes adding support for a `config.h`/`rules.mk` value to info.json.
+
+### Add it to the schema
+
+QMK maintains schema files in `data/schemas`. The values that go into keyboard-specific `info.json` files are kept in `keyboard.jsonschema`. Any value you want to make available to end users to edit must go in here.
+
+In some cases you can simply add a new top-level key. Some examples to follow are `keyboard_name`, `maintainer`, `processor`, and `url`. This is appropriate when your option is self-contained and not directly related to other options. In other cases you should group like options together in an `object`. This is particularly true when adding support for a feature. Some examples to follow for this are `indicators`, `matrix_pins`, and `rgblight`. If you are not sure how to integrate your new option(s) [open an issue](https://github.com/qmk/qmk_firmware/issues/new?assignees=&labels=cli%2C+python&template=other_issues.md&title=) or [join #cli on Discord](https://discord.gg/heQPAgy) and start a conversation there.
+
+### Add code to extract it
+
+Whenever QMK generates a complete `info.json` it extracts information from `config.h` and `rules.mk`. You will need to add code for your new config value to `lib/python/qmk/info.py`. Typically this means adding a new `_extract_<feature>()` function and then calling your function in either `_extract_config_h()` or `_extract_rules_mk()`.
+
+If you are not sure how to edit this file or are not comfortable with Python [open an issue](https://github.com/qmk/qmk_firmware/issues/new?assignees=&labels=cli%2C+python&template=other_issues.md&title=) or [join #cli on Discord](https://discord.gg/heQPAgy) and someone can help you with this part.
+
+### Add code to generate it
+
+The final piece of the puzzle is providing your new option to the build system. This is done by generating two files:
+
+* `.build/obj_<keyboard>/src/info_config.h`
+* `.build/obj_<keyboard>/src/rules.mk`
+
+These two files are generated by the code here:
+
+* `lib/python/qmk/cli/generate/config_h.py`
+* `lib/python/qmk/cli/generate/rules_mk.py`
+
+For `config.h` values you'll need to write a function for your rule(s) and call that function in `generate_config_h()`.
+
+If you have a new top-level `info.json` key for `rules.mk` you can simply add your keys to `info_to_rules` at the top of `lib/python/qmk/cli/generate/rules_mk.py`. Otherwise you'll need to create a new if block for your feature in `generate_rules_mk()`.
diff --git a/docs/feature_mouse_keys.md b/docs/feature_mouse_keys.md
index ffde13389..a0d02416f 100644
--- a/docs/feature_mouse_keys.md
+++ b/docs/feature_mouse_keys.md
@@ -42,6 +42,7 @@ In your keymap you can use the following keycodes to map key presses to mouse ac
 Mouse keys supports three different modes to move the cursor:
 
 * **Accelerated (default):** Holding movement keys accelerates the cursor until it reaches its maximum speed.
+* **Kinetic:** Holding movement keys accelerates the cursor with its speed following a quadratic curve until it reaches its maximum speed.
 * **Constant:** Holding movement keys moves the cursor at constant speeds.
 * **Combined:** Holding movement keys accelerates the cursor until it reaches its maximum speed, but holding acceleration and movement keys simultaneously moves the cursor at constant speeds.
 
@@ -56,7 +57,8 @@ This is the default mode. You can adjust the cursor and scrolling acceleration u
 |Define                      |Default|Description                                              |
 |----------------------------|-------|---------------------------------------------------------|
 |`MOUSEKEY_DELAY`            |300    |Delay between pressing a movement key and cursor movement|
-|`MOUSEKEY_INTERVAL`         |50     |Time between cursor movements                            |
+|`MOUSEKEY_INTERVAL`         |50     |Time between cursor movements in milliseconds            |
+|`MOUSEKEY_MOVE_DELTA`       |5      |Step size                                                |
 |`MOUSEKEY_MAX_SPEED`        |10     |Maximum cursor speed at which acceleration stops         |
 |`MOUSEKEY_TIME_TO_MAX`      |20     |Time until maximum cursor speed is reached               |
 |`MOUSEKEY_WHEEL_DELAY`      |300    |Delay between pressing a wheel key and wheel movement    |
@@ -73,6 +75,30 @@ Tips:
 
 Cursor acceleration uses the same algorithm as the X Window System MouseKeysAccel feature. You can read more about it [on Wikipedia](https://en.wikipedia.org/wiki/Mouse_keys).
 
+### Kinetic Mode
+
+This is an extension of the accelerated mode. The kinetic mode uses a quadratic curve on the cursor speed which allows precise movements at the beginning and allows to cover large distances by increasing cursor speed quickly thereafter.  You can adjust the cursor and scrolling acceleration using the following settings in your keymap’s `config.h` file:
+
+|Define                                |Default  |Description                                                    |
+|--------------------------------------|---------|---------------------------------------------------------------|
+|`MK_KINETIC_SPEED`                    |undefined|Enable kinetic mode                                            |
+|`MOUSEKEY_DELAY`                      |8        |Delay between pressing a movement key and cursor movement      |
+|`MOUSEKEY_INTERVAL`                   |8        |Time between cursor movements in milliseconds                  |
+|`MOUSEKEY_MOVE_DELTA`                 |25       |Step size for accelerating from initial to base speed          |
+|`MOUSEKEY_INITIAL_SPEED`              |100      |Initial speed of the cursor in pixel per second                |
+|`MOUSEKEY_BASE_SPEED`                 |1000     |Maximum cursor speed at which acceleration stops               |
+|`MOUSEKEY_DECELERATED_SPEED`          |400      |Decelerated cursor speed                                       |
+|`MOUSEKEY_ACCELERATED_SPEED`          |3000     |Accelerated cursor speed                                       |
+|`MOUSEKEY_WHEEL_INITIAL_MOVEMENTS`    |16       |Initial number of movements of the mouse wheel                 |
+|`MOUSEKEY_WHEEL_BASE_MOVEMENTS`       |32       |Maximum number of movements at which acceleration stops        |
+|`MOUSEKEY_WHEEL_ACCELERATED_MOVEMENTS`|48       |Accelerated wheel movements                                    |
+|`MOUSEKEY_WHEEL_DECELERATED_MOVEMENTS`|8        |Decelerated wheel movements                                    |
+
+Tips:
+
+* The smoothness of the cursor movement depends on the `MOUSEKEY_INTERVAL` setting. The shorter the interval is set the smoother the movement will be.  Setting the value too low makes the cursor unresponsive.  Lower settings are possible if the micro processor is fast enough. For example: At an interval of `8` milliseconds, `125` movements per second will be initiated.  With a base speed of `1000` each movement will move the cursor by `8` pixels.
+* Mouse wheel movements are implemented differently from cursor movements. While it's okay for the cursor to move multiple pixels at once for the mouse wheel this would lead to jerky movements. Instead, the mouse wheel operates at step size `1`. Setting mouse wheel speed is done by adjusting the number of wheel movements per second.
+
 ### Constant mode
 
 In this mode you can define multiple different speeds for both the cursor and the mouse wheel. There is no acceleration. `KC_ACL0`, `KC_ACL1` and `KC_ACL2` change the cursor and scroll speed to their respective setting.
diff --git a/docs/feature_rgb_matrix.md b/docs/feature_rgb_matrix.md
index a9e711c9f..bb0acba3b 100644
--- a/docs/feature_rgb_matrix.md
+++ b/docs/feature_rgb_matrix.md
@@ -129,6 +129,28 @@ Configure the hardware via your `config.h`:
 
 ---
 
+### APA102 :id=apa102
+
+There is basic support for APA102 based addressable LED strands. To enable it, add this to your `rules.mk`:
+
+```makefile
+RGB_MATRIX_ENABLE = yes
+RGB_MATRIX_DRIVER = APA102
+```
+
+Configure the hardware via your `config.h`:
+
+```c
+// The pin connected to the data pin of the LEDs
+#define RGB_DI_PIN D7
+// The pin connected to the clock pin of the LEDs
+#define RGB_CI_PIN D6
+// The number of LEDs connected
+#define DRIVER_LED_TOTAL 70
+```
+
+---
+
 From this point forward the configuration is the same for all the drivers. The `led_config_t` struct provides a key electrical matrix to led index lookup table, what the physical position of each LED is on the board, and what type of key or usage the LED if the LED represents. Here is a brief example:
 
 ```c
diff --git a/docs/feature_rgblight.md b/docs/feature_rgblight.md
index 844e3e6d7..24a13a112 100644
--- a/docs/feature_rgblight.md
+++ b/docs/feature_rgblight.md
@@ -10,6 +10,7 @@ Currently QMK supports the following addressable LEDs (however, the white LED in
 
  * WS2811, WS2812, WS2812B, WS2812C, etc.
  * SK6812, SK6812MINI, SK6805
+ * APA102
 
 These LEDs are called "addressable" because instead of using a wire per color, each LED contains a small microchip that understands a special protocol sent over a single wire. The chip passes on the remaining data to the next LED, allowing them to be chained together. In this way, you can easily control the color of the individual LEDs.
 
@@ -21,11 +22,19 @@ On keyboards with onboard RGB LEDs, it is usually enabled by default. If it is n
 RGBLIGHT_ENABLE = yes
 ```
 
-At minimum you must define the data pin your LED strip is connected to, and the number of LEDs in the strip, in your `config.h`. If your keyboard has onboard RGB LEDs, and you are simply creating a keymap, you usually won't need to modify these.
+For APA102 LEDs, add the following to your `rules.mk`:
+
+```make
+RGBLIGHT_ENABLE = yes
+RGBLIGHT_DRIVER = APA102
+```
+
+At minimum you must define the data pin your LED strip is connected to, and the number of LEDs in the strip, in your `config.h`. For APA102 LEDs, you must also define the clock pin. If your keyboard has onboard RGB LEDs, and you are simply creating a keymap, you usually won't need to modify these.
 
 |Define         |Description                                                                                              |
 |---------------|---------------------------------------------------------------------------------------------------------|
 |`RGB_DI_PIN`   |The pin connected to the data pin of the LEDs                                                            |
+|`RGB_CI_PIN`   |The pin connected to the clock pin of the LEDs (APA102 only)                                             |
 |`RGBLED_NUM`   |The number of LEDs connected                                                                             |
 |`RGBLED_SPLIT` |(Optional) For split keyboards, the number of LEDs connected on each half directly wired to `RGB_DI_PIN` |
 
@@ -139,7 +148,7 @@ The following options are used to tweak the various animations:
 |`RGBLIGHT_EFFECT_KNIGHT_OFFSET`     |`0`          |The number of LEDs to start the "Knight" animation from the start of the strip by              |
 |`RGBLIGHT_RAINBOW_SWIRL_RANGE`      |`255`        |Range adjustment for the rainbow swirl effect to get different swirls                          |
 |`RGBLIGHT_EFFECT_SNAKE_LENGTH`      |`4`          |The number of LEDs to light up for the "Snake" animation                                       |
-|`RGBLIGHT_EFFECT_TWINKLE_LIFE`      |`75`         |Adjusts how quickly each LED brightens and dims when twinkling (in animation steps)            |
+|`RGBLIGHT_EFFECT_TWINKLE_LIFE`      |`200`        |Adjusts how quickly each LED brightens and dims when twinkling (in animation steps)            |
 |`RGBLIGHT_EFFECT_TWINKLE_PROBABILITY`|`1/127`     |Adjusts how likely each LED is to twinkle (on each animation step)                             |
 
 ### Example Usage to Reduce Memory Footprint
diff --git a/docs/feature_split_keyboard.md b/docs/feature_split_keyboard.md
index b23411420..c285e353d 100644
--- a/docs/feature_split_keyboard.md
+++ b/docs/feature_split_keyboard.md
@@ -181,6 +181,16 @@ If you're having issues with serial communication, you can change this value, as
 * **`4`**: about 26kbps
 * **`5`**: about 20kbps
 
+```c
+#define SPLIT_MODS_ENABLE
+```
+
+This enables transmitting modifier state (normal, weak and oneshot) to the non
+primary side of the split keyboard.  This adds a few bytes of data to the split
+communication protocol and may impact the matrix scan speed when enabled.
+The purpose of this feature is to support cosmetic use of modifer state (e.g.
+displaying status on an OLED screen).
+
 ###  Hardware Configuration Options
 
 There are some settings that you may need to configure, based on how the hardware is set up. 
diff --git a/docs/ja/proton_c_conversion.md b/docs/ja/proton_c_conversion.md
index 6e4f7dcb6..e7c07413c 100644
--- a/docs/ja/proton_c_conversion.md
+++ b/docs/ja/proton_c_conversion.md
@@ -51,6 +51,7 @@ Proton C には1つのオンボード LED(C13)しかなく、デフォルトで�
 
 ```
 MCU = STM32F303
+BOARD = QMK_PROTON_C
 ```
 
 次の変数が存在する場合は削除します。
diff --git a/docs/proton_c_conversion.md b/docs/proton_c_conversion.md
index 1b5e496e7..47511e1b1 100644
--- a/docs/proton_c_conversion.md
+++ b/docs/proton_c_conversion.md
@@ -44,6 +44,7 @@ To use the Proton C natively, without having to specify `CTPC=yes`, you need to
 
 ```
 MCU = STM32F303
+BOARD = QMK_PROTON_C
 ```
 
 Remove these variables if they exist:
diff --git a/docs/reference_info_json.md b/docs/reference_info_json.md
index 3ca62c719..c9864ea2d 100644
--- a/docs/reference_info_json.md
+++ b/docs/reference_info_json.md
@@ -19,8 +19,20 @@ The `info.json` file is a JSON formatted dictionary with the following keys avai
   * Width of the board in Key Units
 * `height`
   * Height of the board in Key Units
+* `debounce`
+  * How many milliseconds (ms) to wait for debounce to happen. (Default: 5)
+* `diode_direction`
+  * The direction diodes face. See [`DIRECT_PINS` in the hardware configuration](https://docs.qmk.fm/#/config_options?id=hardware-options) for more details.
+* `layout_aliases`
+  * A dictionary containing layout aliases. The key is the alias and the value is a layout in `layouts` it maps to.
 * `layouts`
-  * Physical Layout representations. See the next section for more detail.
+  * Physical Layout representations. See the [Layout Format](#layout_format) section for more detail.
+* `matrix_pins`
+  * Configure the pins corresponding to columns and rows, or direct pins. See [Matrix Pins](#matrix_pins) for more detail.
+* `rgblight`
+  * Configure the [RGB Lighting feature](feature_rgblight.md). See the [RGB Lighting](#rgb_lighting) section for more detail.
+* `usb`
+  * Configure USB VID, PID, and other parameters. See [USB](#USB) for more detail.
 
 ### Layout Format
 
@@ -49,25 +61,129 @@ All key positions and rotations are specified in relation to the top-left corner
   * The width of the key, in Key Units. Ignored if `ks` is provided. Default: `1`
 * `h`
   * The height of the key, in Key Units. Ignored if `ks` is provided. Default: `1`
-* `r`
-  * How many degrees clockwise to rotate the key.
-* `rx`
-  * The absolute position of the point to rotate the key around in the horizontal axis. Default: `x`
-* `ry`
-  * The absolute position of the point to rotate the key around in the vertical axis. Default: `y`
-* `ks`
-  * Key Shape: define a polygon by providing a list of points, in Key Units.
-  * **Important**: These are relative to the top-left of the key, not absolute.
-  * Example ISO Enter: `[ [0,0], [1.5,0], [1.5,2], [0.25,2], [0.25,1], [0,1], [0,0] ]`
 * `label`
   * What to name this position in the matrix.
-  * This should usually be the same name as what is silkscreened on the PCB at this location.
-
-## How is the Metadata Exposed?
-
-This metadata is primarily used in two ways:
-
-* To allow web-based configurators to dynamically generate UI
-* To support the new `make keyboard:keymap:qmk` target, which bundles this metadata up with the firmware to allow QMK Toolbox to be smarter.
-
-Configurator authors can see the [QMK Compiler](https://docs.api.qmk.fm/using-the-api) docs for more information on using the JSON API.
+  * This should usually correspond to the keycode for the first layer of the default keymap.
+* `matrix`
+  * A 2 item list describing the row and column location for this key.
+
+### Matrix Pins
+
+Currently QMK supports connecting switches either directly to GPIO pins or via a switch matrix. At this time you can not combine these, they are mutually exclusive.
+
+#### Switch Matrix
+
+Most keyboards use a switch matrix to connect keyswitches to the MCU. You can define your pin columns and rows to configure your switch matrix. When defining switch matrices you should also define your `diode_direction`.
+
+Example:
+
+```json
+{
+  "diode_direction": "COL2ROW",
+  "matrix_pins": {
+    "cols": ["F4", "E6", "B1", "D2"],
+    "rows": ["B0", "D3", "D5", "D4", "D6"]
+  }
+}
+```
+
+#### Direct Pins
+
+Direct pins are when you connect one side of the switch to GND and the other side to a GPIO pin on your MCU. No diode is required, but there is a 1:1 mapping between switches and pins.
+
+When specifying direct pins you need to arrange them in nested arrays. The outer array consists of rows, while the inner array is a text string corresponding to a pin. You can use `null` to indicate an empty spot in the matrix.
+
+Example:
+
+```json
+{
+    "matrix_pins": {
+        "direct": [
+            ["A10", "A9"],
+            ["A0", "B8"],
+            [null, "B11"],
+            ["B9", "A8"],
+            ["A7", "B1"],
+            [null, "B2"]
+        ]
+    }
+}
+```
+
+### RGB Lighting
+
+This section controls the legacy WS2812 support in QMK. This should not be confused with the RGB Matrix feature, which can be used to control both WS2812 and ISSI RGB LEDs.
+
+The following items can be set. Not every value is required.
+
+* `led_count`
+    * The number of LEDs in your strip
+* `pin`
+    * The GPIO pin that your LED strip is connected to
+* `animations`
+    * A dictionary that lists enabled and disabled animations. See [RGB Light Animations](#rgb_light_animations) below.
+* `sleep`
+    * Set to `true` to enable lighting during host sleep
+* `split`
+    * Set to `true` to enable synchronization functionality between split halves
+* `split_count`
+    * For split keyboards, the number of LEDs on each side
+* `max_brightness`
+    * (0-255) What the maxmimum brightness (value) level is
+* `hue_steps`
+    * How many steps of adjustment to have for hue
+* `saturation_steps`
+    * How many steps of adjustment to have for saturation
+* `brightness_steps`
+    * How many steps of adjustment to have for brightness (value)
+
+Example:
+
+```json
+{
+    "rgblight": {
+        "led_count": 4,
+        "pin": "F6",
+        "hue_steps": 10,
+        "saturation_steps": 17,
+        "brightness_steps": 17,
+        "animations": {
+            "all": true
+        }
+    }
+}
+```
+
+#### RGB Light Animations
+
+The following animations can be enabled:
+
+| Key | Description |
+|-----|-------------|
+| `all` | Enable all additional animation modes. |
+| `alternating` | Enable alternating animation mode. |
+| `breathing` | Enable breathing animation mode. |
+| `christmas` | Enable christmas animation mode. |
+| `knight` | Enable knight animation mode. |
+| `rainbow_mood` | Enable rainbow mood animation mode. |
+| `rainbow_swirl` | Enable rainbow swirl animation mode. |
+| `rgb_test` | Enable RGB test animation mode. |
+| `snake` | Enable snake animation mode. |
+| `static_gradient` | Enable static gradient mode. |
+| `twinkle` | Enable twinkle animation mode. |
+
+### USB
+
+Every USB keyboard needs to have its USB parmaters defined. At a minimum you need to set vid, pid, and device version.
+
+Example:
+
+```json
+{
+  "usb": {
+    "vid": "0xC1ED",
+    "pid": "0x23B0",
+    "device_ver": "0x0001"
+  }
+}
+```
diff --git a/docs/reference_keymap_extras.md b/docs/reference_keymap_extras.md
index f2abb4e59..40a195684 100644
--- a/docs/reference_keymap_extras.md
+++ b/docs/reference_keymap_extras.md
@@ -18,7 +18,9 @@ To use these, simply `#include` the corresponding [header file](https://github.c
 |Dutch (Belgium)            |`keymap_belgian.h`              |
 |English (Ireland)          |`keymap_irish.h`                |
 |English (UK)               |`keymap_uk.h`                   |
+|English (US Extended)      |`keymap_us_extended.h`          |
 |English (US International) |`keymap_us_international.h`     |
+|English (US International, Linux)|`keymap_us_international_linux.h`|
 |Estonian                   |`keymap_estonian.h`             |
 |Finnish                    |`keymap_finnish.h`              |
 |French                     |`keymap_french.h`               |
diff --git a/docs/serial_driver.md b/docs/serial_driver.md
index bc376b6dd..c98f4c117 100644
--- a/docs/serial_driver.md
+++ b/docs/serial_driver.md
@@ -60,6 +60,7 @@ Configure the hardware via your config.h:
                                    //  5: about 19200 baud
 #define SERIAL_USART_DRIVER SD1 // USART driver of TX pin. default: SD1
 #define SERIAL_USART_TX_PAL_MODE 7 // Pin "alternate function", see the respective datasheet for the appropriate values for your MCU. default: 7
+#define SERIAL_USART_TIMEOUT 100 // USART driver timeout. default 100
 ```
 
 You must also enable the ChibiOS `SERIAL` feature: