2020 November 28 Breaking Changes Update (#11053)

* Branch point for 2020 November 28 Breaking Change                                                

* Remove matrix_col_t to allow MATRIX_ROWS > 32 (#10183)                                           

* Add support for soft serial to ATmega32U2 (#10204)                                               

* Change MIDI velocity implementation to allow direct control of velocity value (#9940)            

* Add ability to build a subset of all keyboards based on platform.                                

* Actually use eeprom_driver_init().                                                               

* Make bootloader_jump weak for ChibiOS. (#10417)                                                  

* Joystick 16-bit support (#10439)                                                                 

* Per-encoder resolutions (#10259)                                                                 

* Share button state from mousekey to pointing_device (#10179)                                     

* Add hotfix for chibios keyboards not wake (#10088)                                               

* Add advanced/efficient RGB Matrix Indicators (#8564)                                             

* Naming change.                                                                                   

* Support for STM32 GPIOF,G,H,I,J,K (#10206)                                                       

* Add milc as a dependency and remove the installed milc (#10563)                                  

* ChibiOS upgrade: early init conversions (#10214)                                                 

* ChibiOS upgrade: configuration file migrator (#9952)                                             

* Haptic and solenoid cleanup (#9700)                                                              

* XD75 cleanup (#10524)                                                                            

* OLED display update interval support (#10388)                                                    

* Add definition based on currently-selected serial driver. (#10716)                               

* New feature: Retro Tapping per key (#10622)                                                      

* Allow for modification of output RGB values when using rgblight/rgb_matrix. (#10638)             

* Add housekeeping task callbacks so that keyboards/keymaps are capable of executing code for each main loop iteration. (#10530)

* Rescale both ChibiOS and AVR backlighting.                                                       

* Reduce Helix keyboard build variation (#8669)                                                    

* Minor change to behavior allowing display updates to continue between task ticks (#10750)        

* Some GPIO manipulations in matrix.c change to atomic. (#10491)                                   

* qmk cformat (#10767)                                                                             

* [Keyboard] Update the Speedo firmware for v3.0 (#10657)                                          

* Maartenwut/Maarten namechange to evyd13/Evy (#10274)                                             

* [quantum] combine repeated lines of code (#10837)                                                

* Add step sequencer feature (#9703)                                                               

* aeboards/ext65 refactor (#10820)                                                                 

* Refactor xelus/dawn60 for Rev2 later (#10584)                                                    

* add DEBUG_MATRIX_SCAN_RATE_ENABLE to common_features.mk (#10824)                                 

* [Core] Added `add_oneshot_mods` & `del_oneshot_mods` (#10549)                                    

* update chibios os usb for the otg driver (#8893)                                                 

* Remove HD44780 References, Part 4 (#10735)                                                       

* [Keyboard] Add Valor FRL TKL (+refactor) (#10512)                                                

* Fix cursor position bug in oled_write_raw functions (#10800)                                     

* Fixup version.h writing when using SKIP_VERSION=yes (#10972)                                     

* Allow for certain code in the codebase assuming length of string. (#10974)                       

* Add AT90USB support for serial.c (#10706)                                                        

* Auto shift: support repeats and early registration (#9826)                                       

* Rename ledmatrix.h to match .c file (#7949)                                                      

* Split RGB_MATRIX_ENABLE into _ENABLE and _DRIVER (#10231)                                        

* Split LED_MATRIX_ENABLE into _ENABLE and _DRIVER (#10840)                                        

* Merge point for 2020 Nov 28 Breaking Change                                                      

18 files changed, 385 insertions, 58 deletions

diff --git a/docs/ChangeLog/20201128.md b/docs/ChangeLog/20201128.md
new file mode 100644
index 0000000000..86abd384df
--- /dev/null
+++ b/docs/ChangeLog/20201128.md
@@ -0,0 +1,150 @@
+# QMK Breaking Change - 2020 Nov 28 Changelog
+
+Four times a year QMK runs a process for merging Breaking Changes. A Breaking Change is any change which modifies how QMK behaves in a way that is incompatible or potentially dangerous. We limit these changes to 4 times per year so that users can have confidence that updating their QMK tree will not break their keymaps.
+
+
+## Changes Requiring User Action :id=changes-requiring-user-action
+
+### Relocated Keyboards :id-relocated-keyboards
+
+#### Reduce Helix keyboard build variation ([#8669](https://github.com/qmk/qmk_firmware/pull/8669))
+
+The build commands for the Helix keyboard are:
+
+```
+make <helix_build_name>:<keymap_name>
+```
+
+For `<helix_build_name>`, specify the one in the rightmost column of the table below, such as `helix`,` helix/pico`.
+
+| before Oct 17 2019   |  Oct 17 2019            | Mar 10 2020             | Nov 28 2020             |
+| ---------------------|-------------------------|-------------------------| ------------------------|
+| helix/rev1           | helix/rev1              | helix/rev1              | helix/rev1              |
+| helix/pico           | helix/pico              | helix/pico              | helix/pico              |
+|                      | helix/pico/back         | helix/pico/back         | helix/pico/back         |
+|                      | helix/pico/under        | helix/pico/under        | helix/pico/under        |
+|                      |                         | helix/pico/sc           | --                      |
+|                      |                         | helix/pico/sc/back      | helix/pico/sc           |
+|                      |                         | helix/pico/sc/under     | --                      |
+| helix/rev2 (=helix)  | helix/rev2 (=helix)     | helix/rev2 (=helix)     | --                      |
+|                      | helix/rev2/back         | helix/rev2/back         | --                      |
+|                      | helix/rev2/back/oled    | helix/rev2/back/oled    | ( --> helix/rev2/back)  |
+|                      | helix/rev2/oled         | helix/rev2/oled         | helix/rev2　(=helix)     |
+|                      | helix/rev2/oled/back    | helix/rev2/oled/back    | helix/rev2/back         |
+|                      | helix/rev2/oled/under   | helix/rev2/oled/under   | helix/rev2/under        |
+|                      |                         | helix/rev2/sc           | --                      |
+|                      |                         | helix/rev2/sc/back      | --                      |
+|                      |                         | helix/rev2/sc/oled      | --                      |
+|                      |                         | helix/rev2/sc/oledback  | helix/rev2/sc           |
+|                      |                         | helix/rev2/sc/oledunder | --                      |
+|                      |                         | helix/rev2/sc/under     | --                      |
+|                      | helix/rev2/under        | helix/rev2/under        | --                      |
+|                      | helix/rev2/under/oled   | helix/rev2/under/oled   | ( --> helix/rev2/under) |
+
+#### Update the Speedo firmware for v3.0 ([#10657](https://github.com/qmk/qmk_firmware/pull/10657))
+
+The Speedo keyboard has moved to `cozykeys/speedo/v2` as the designer prepares to release the Speedo v3.0.
+
+| Previous Name | New Name                   |
+| :------------ | :------------------------- |
+| speedo        | cozykeys/speedo/v2         |
+| --            | cozykeys/speedo/v3 **new** |
+
+#### Maartenwut/Maarten name change to evyd13/Evy ([#10274](https://github.com/qmk/qmk_firmware/pull/10274))
+
+Maartenwut has rebranded as @evyd13, and all released Maartenwut boards have moved.
+
+| Previous Name          | New Name           |
+| :--------------------- | :----------------- |
+| maartenwut/atom47/rev2 | evyd13/atom47/rev2 |
+| maartenwut/atom47/rev3 | evyd13/atom47/rev3 |
+| maartenwut/eon40       | evyd13/eon40       |
+| maartenwut/eon65       | evyd13/eon65       |
+| maartenwut/eon75       | evyd13/eon75       |
+| maartenwut/eon87       | evyd13/eon87       |
+| maartenwut/eon95       | evyd13/eon95       |
+| maartenwut/gh80_1800   | evyd13/gh80_1800   |
+| maartenwut/gh80_3700   | evyd13/gh80_3700   |
+| maartenwut/minitomic   | evyd13/minitomic   |
+| maartenwut/mx5160      | evyd13/mx5160      |
+| maartenwut/nt660       | evyd13/nt660       |
+| maartenwut/omrontkl    | evyd13/omrontkl    |
+| maartenwut/plain60     | evyd13/plain60     |
+| maartenwut/pockettype  | evyd13/pockettype  |
+| maartenwut/quackfire   | evyd13/quackfire   |
+| maartenwut/solheim68   | evyd13/solheim68   |
+| maartenwut/ta65        | evyd13/ta65        |
+| maartenwut/wasdat      | evyd13/wasdat      |
+| maartenwut/wasdat_code | evyd13/wasdat_code |
+| maartenwut/wonderland  | evyd13/wonderland  |
+
+#### Xelus Valor and Dawn60 Refactors ([#10512](https://github.com/qmk/qmk_firmware/pull/10512), [#10584](https://github.com/qmk/qmk_firmware/pull/10584))
+
+The Valor and Dawn60 keyboards by Xelus22 both now require their revisions to be specified when compiling.
+
+| Previous Name | New Name          |
+| :------------ | :---------------- |
+| xelus/dawn60  | xelus/dawn60/rev1 |
+| xelus/valor   | xelus/valor/rev1  |
+
+
+### Updated Keyboard Codebases :id=keyboard-updates
+
+#### AEboards EXT65 Refactor ([#10820](https://github.com/qmk/qmk_firmware/pull/10820))
+
+The EXT65 codebase has been reworked so keymaps can be used with either revision.
+
+
+## Core Changes :id=core-changes
+
+### Fixes :id=core-fixes
+
+* Reconnect the USB if users wake up a computer from the keyboard to restore the USB state ([#10088](https://github.com/qmk/qmk_firmware/pull/10088))
+* Fix cursor position bug in oled_write_raw functions ([#10800](https://github.com/qmk/qmk_firmware/pull/10800))
+
+### Additions and Enhancements :id=core-additions
+
+* Allow MATRIX_ROWS to be greater than 32 ([#10183](https://github.com/qmk/qmk_firmware/pull/10183))
+* Add support for soft serial to ATmega32U2 ([#10204](https://github.com/qmk/qmk_firmware/pull/10204))
+* Allow direct control of MIDI velocity value ([#9940](https://github.com/qmk/qmk_firmware/pull/9940))
+* Joystick 16-bit support ([#10439](https://github.com/qmk/qmk_firmware/pull/10439))
+* Allow encoder resolutions to be set per encoder ([#10259](https://github.com/qmk/qmk_firmware/pull/10259))
+* Share button state from mousekey to pointing_device ([#10179](https://github.com/qmk/qmk_firmware/pull/10179))
+* Add advanced/efficient RGB Matrix Indicators ([#8564](https://github.com/qmk/qmk_firmware/pull/8564))
+* OLED display update interval support ([#10388](https://github.com/qmk/qmk_firmware/pull/10388))
+* Per-Key Retro Tapping ([#10622](https://github.com/qmk/qmk_firmware/pull/10622))
+* Allow backlight duty cycle limit ([#10260](https://github.com/qmk/qmk_firmware/pull/10260))
+* Add step sequencer feature ([#9703](https://github.com/qmk/qmk_firmware/pull/9703))
+* Added `add_oneshot_mods` & `del_oneshot_mods` ([#10549](https://github.com/qmk/qmk_firmware/pull/10549))
+* Add AT90USB support for serial.c ([#10706](https://github.com/qmk/qmk_firmware/pull/10706))
+* Auto shift: support repeats and early registration (#9826)
+
+### Clean-ups and Optimizations :id=core-optimizations
+
+* Haptic and solenoid cleanup ([#9700](https://github.com/qmk/qmk_firmware/pull/9700))
+* XD75 cleanup ([#10524](https://github.com/qmk/qmk_firmware/pull/10524))
+* Minor change to behavior allowing display updates to continue between task ticks ([#10750](https://github.com/qmk/qmk_firmware/pull/10750))
+* Change some GPIO manipulations in matrix.c to be atomic ([#10491](https://github.com/qmk/qmk_firmware/pull/10491))
+* combine repeated lines of code for ATmega32U2, ATmega16U2, ATmega328 and ATmega328P ([#10837](https://github.com/qmk/qmk_firmware/pull/10837))
+* Remove references to HD44780 ([#10735](https://github.com/qmk/qmk_firmware/pull/10735))
+
+
+## QMK Infrastructure and Internals :id=qmk-internals
+
+* Add ability to build a subset of all keyboards based on platform. ([#10420](https://github.com/qmk/qmk_firmware/pull/10420))
+* Initialise EEPROM drivers at startup, instead of upon first execution ([#10438](https://github.com/qmk/qmk_firmware/pull/10438))
+* Make bootloader_jump weak for ChibiOS ([#10417](https://github.com/qmk/qmk_firmware/pull/10417))
+* Support for STM32 GPIOF,G,H,I,J,K ([#10206](https://github.com/qmk/qmk_firmware/pull/10206))
+* Add milc as a dependency and remove the installed milc ([#10563](https://github.com/qmk/qmk_firmware/pull/10563))
+* ChibiOS upgrade: early init conversions ([#10214](https://github.com/qmk/qmk_firmware/pull/10214))
+* ChibiOS upgrade: configuration file migrator ([#9952](https://github.com/qmk/qmk_firmware/pull/9952))
+* Add definition based on currently-selected serial driver. ([#10716](https://github.com/qmk/qmk_firmware/pull/10716))
+* Allow for modification of output RGB values when using rgblight/rgb_matrix. ([#10638](https://github.com/qmk/qmk_firmware/pull/10638))
+* Allow keyboards/keymaps to execute code at each main loop iteration ([#10530](https://github.com/qmk/qmk_firmware/pull/10530))
+* qmk cformat ([#10767](https://github.com/qmk/qmk_firmware/pull/10767))
+* Add a Make variable to easily enable DEBUG_MATRIX_SCAN_RATE on the command line ([#10824](https://github.com/qmk/qmk_firmware/pull/10824))
+* update Chibios OS USB for the OTG driver ([#8893](https://github.com/qmk/qmk_firmware/pull/8893))
+* Fixup version.h writing when using `SKIP_VERSION=yes` ([#10972](https://github.com/qmk/qmk_firmware/pull/10972), [#10974](https://github.com/qmk/qmk_firmware/pull/10974))
+* Rename ledmatrix.h to match .c file ([#7949](https://github.com/qmk/qmk_firmware/pull/7949))
+* Split RGB_MATRIX_ENABLE into _ENABLE and _DRIVER ([#10231](https://github.com/qmk/qmk_firmware/pull/10231))
+* Split LED_MATRIX_ENABLE into _ENABLE and _DRIVER ([#10840](https://github.com/qmk/qmk_firmware/pull/10840))
diff --git a/docs/_summary.md b/docs/_summary.md
index 44030d812d..19498f6a20 100644
--- a/docs/_summary.md
+++ b/docs/_summary.md
@@ -80,6 +80,7 @@
     * [One Shot Keys](one_shot_keys.md)
     * [Pointing Device](feature_pointing_device.md)
     * [Raw HID](feature_rawhid.md)
+    * [Sequencer](feature_sequencer.md)
     * [Swap Hands](feature_swap_hands.md)
     * [Tap Dance](feature_tap_dance.md)
     * [Tap-Hold Configuration](tap_hold.md)
@@ -119,6 +120,7 @@
     * [Overview](breaking_changes.md)
     * [My Pull Request Was Flagged](breaking_changes_instructions.md)
     * History
+      * [2020 Nov 28](ChangeLog/20201128.md)
       * [2020 Aug 29](ChangeLog/20200829.md)
       * [2020 May 30](ChangeLog/20200530.md)
       * [2020 Feb 29](ChangeLog/20200229.md)
diff --git a/docs/breaking_changes.md b/docs/breaking_changes.md
index abace81648..3ee14f2bfc 100644
--- a/docs/breaking_changes.md
+++ b/docs/breaking_changes.md
@@ -6,6 +6,7 @@ The breaking change period is when we will merge PR's that change QMK in dangero
 
 ## What has been included in past Breaking Changes?
 
+* [2020 Nov 28](ChangeLog/20201128.md)
 * [2020 Aug 29](ChangeLog/20200829.md)
 * [2020 May 30](ChangeLog/20200530.md)
 * [2020 Feb 29](ChangeLog/20200229.md)
@@ -13,16 +14,16 @@ The breaking change period is when we will merge PR's that change QMK in dangero
 
 ## When is the next Breaking Change?
 
-The next Breaking Change is scheduled for November 28, 2020.
+The next Breaking Change is scheduled for February 27, 2021.
 
 ### Important Dates
 
-* [x] 2020 Aug 29 - `develop` is created. It will be rebased weekly.
-* [ ] 2020 Oct 31 - `develop` closed to new PR's.
-* [ ] 2020 Oct 31 - Call for testers.
-* [ ] 2020 Nov 26 - `master` is locked, no PR's merged.
-* [ ] 2020 Nov 28 - Merge `develop` to `master`.
-* [ ] 2020 Nov 28 - `master` is unlocked. PR's can be merged again.
+* [x] 2020 Nov 28 - `develop` is created. Each push to `master` is subsequently merged to `develop`
+* [ ] 2021 Jan 30 - `develop` closed to new PR's.
+* [ ] 2021 Jan 30 - Call for testers.
+* [ ] 2021 Feb 25 - `master` is locked, no PR's merged.
+* [ ] 2021 Feb 27 - Merge `develop` to `master`.
+* [ ] 2021 Feb 27 - `master` is unlocked. PR's can be merged again.
 
 ## What changes will be included?
 
@@ -39,21 +40,6 @@ Criteria for acceptance:
 
 This section documents various processes we use when running the Breaking Changes process.
 
-## Rebase `develop` from `master`
-
-This is run every Friday while `develop` is open.
-
-Process:
-
-```
-cd qmk_firmware
-git checkout master
-git pull --ff-only
-git checkout develop
-git rebase master
-git push --force
-```
-
 ## Creating the `develop` branch
 
 This happens immediately after the previous `develop` branch is merged.
diff --git a/docs/config_options.md b/docs/config_options.md
index f9b1cc6578..3a4d7c87c5 100644
--- a/docs/config_options.md
+++ b/docs/config_options.md
@@ -135,6 +135,8 @@ If you define these options you will enable the associated feature, which may in
 * `#define RETRO_TAPPING`
   * tap anyway, even after TAPPING_TERM, if there was no other key interruption between press and release
   * See [Retro Tapping](tap_hold.md#retro-tapping) for details
+* `#define RETRO_TAPPING_PER_KEY`
+  * enables handling for per key `RETRO_TAPPING` settings
 * `#define TAPPING_TOGGLE 2`
   * how many taps before triggering the toggle
 * `#define PERMISSIVE_HOLD`
diff --git a/docs/custom_quantum_functions.md b/docs/custom_quantum_functions.md
index a459042b32..694b421e79 100644
--- a/docs/custom_quantum_functions.md
+++ b/docs/custom_quantum_functions.md
@@ -185,6 +185,14 @@ This function gets called at every matrix scan, which is basically as often as t
 
 You should use this function if you need custom matrix scanning code. It can also be used for custom status output (such as LEDs or a display) or other functionality that you want to trigger regularly even when the user isn't typing.
 
+# Keyboard housekeeping
+
+* Keyboard/Revision: `void housekeeping_task_kb(void)`
+* Keymap: `void housekeeping_task_user(void)`
+
+This function gets called at the end of all QMK processing, before starting the next iteration. You can safely assume that QMK has dealt with the last matrix scan at the time that these functions are invoked -- layer states have been updated, USB reports have been sent, LEDs have been updated, and displays have been drawn.
+
+Similar to `matrix_scan_*`, these are called as often as the MCU can handle. To keep your board responsive, it's suggested to do as little as possible during these function calls, potentially throtting their behaviour if you do indeed require implementing something special.
 
 # Keyboard Idling/Wake Code
 
diff --git a/docs/feature_auto_shift.md b/docs/feature_auto_shift.md
index b21a7690d9..8e04d9dd38 100644
--- a/docs/feature_auto_shift.md
+++ b/docs/feature_auto_shift.md
@@ -15,25 +15,31 @@ problem.
 When you tap a key, it stays depressed for a short period of time before it is
 then released. This depressed time is a different length for everyone. Auto Shift
 defines a constant `AUTO_SHIFT_TIMEOUT` which is typically set to twice your
-normal pressed state time. When you press a key, a timer starts and then stops
-when you release the key. If the time depressed is greater than or equal to the
-`AUTO_SHIFT_TIMEOUT`, then a shifted version of the key is emitted. If the time
-is less than the `AUTO_SHIFT_TIMEOUT` time, then the normal state is emitted.
+normal pressed state time. When you press a key, a timer starts, and if you
+have not released the key after the `AUTO_SHIFT_TIMEOUT` period, then a shifted
+version of the key is emitted. If the time is less than the `AUTO_SHIFT_TIMEOUT`
+time, or you press another key, then the normal state is emitted.
+
+If `AUTO_SHIFT_REPEAT` is defined, there is keyrepeat support. Holding the key
+down will repeat the shifted key, though this can be disabled with
+`AUTO_SHIFT_NO_AUTO_REPEAT`. If you want to repeat the normal key, then tap it
+once then immediately (within `TAPPING_TERM`) hold it down again (this works
+with the shifted value as well if auto-repeat is disabled).
 
 ## Are There Limitations to Auto Shift?
 
 Yes, unfortunately.
 
-1. Key repeat will cease to work. For example, before if you wanted 20 'a'
-   characters, you could press and hold the 'a' key for a second or two. This no
-   longer works with Auto Shift because it is timing your depressed time instead
-   of emitting a depressed key state to your operating system.
-2. You will have characters that are shifted when you did not intend on shifting, and
-   other characters you wanted shifted, but were not. This simply comes down to
-   practice. As we get in a hurry, we think we have hit the key long enough
-   for a shifted version, but we did not. On the other hand, we may think we are
-   tapping the keys, but really we have held it for a little longer than
-   anticipated.
+You will have characters that are shifted when you did not intend on shifting, and
+other characters you wanted shifted, but were not. This simply comes down to
+practice. As we get in a hurry, we think we have hit the key long enough for a
+shifted version, but we did not. On the other hand, we may think we are tapping
+the keys, but really we have held it for a little longer than anticipated.
+
+Additionally, with keyrepeat the desired shift state can get mixed up. It will
+always 'belong' to the last key pressed. For example, keyrepeating a capital
+and then tapping something lowercase (whether or not it's an Auto Shift key)
+will result in the capital's *key* still being held, but shift not.
 
 ## How Do I Enable Auto Shift?
 
@@ -103,6 +109,14 @@ Do not Auto Shift numeric keys, zero through nine.
 
 Do not Auto Shift alpha characters, which include A through Z.
 
+### AUTO_SHIFT_REPEAT (simple define)
+
+Enables keyrepeat.
+
+### AUTO_SHIFT_NO_AUTO_REPEAT (simple define)
+
+Disables automatically keyrepeating when `AUTO_SHIFT_TIMEOUT` is exceeded.
+
 ## Using Auto Shift Setup
 
 This will enable you to define three keys temporarily to increase, decrease and report your `AUTO_SHIFT_TIMEOUT`.
diff --git a/docs/feature_backlight.md b/docs/feature_backlight.md
index 6bb2bbed84..a558af64e1 100644
--- a/docs/feature_backlight.md
+++ b/docs/feature_backlight.md
@@ -62,14 +62,15 @@ Valid driver values are `pwm`, `software`, `custom` or `no`. See below for help
 
 To configure the backlighting, `#define` these in your `config.h`:
 
-|Define               |Default      |Description                                                                          |
-|---------------------|-------------|-------------------------------------------------------------------------------------|
-|`BACKLIGHT_PIN`      |*Not defined*|The pin that controls the LED(s)                                                     |
-|`BACKLIGHT_LEVELS`   |`3`          |The number of brightness levels (maximum 31 excluding off)                           |
-|`BACKLIGHT_CAPS_LOCK`|*Not defined*|Enable Caps Lock indicator using backlight (for keyboards without dedicated LED)     |
-|`BACKLIGHT_BREATHING`|*Not defined*|Enable backlight breathing, if supported                                             |
-|`BREATHING_PERIOD`   |`6`          |The length of one backlight "breath" in seconds                                      |
-|`BACKLIGHT_ON_STATE` |`1`          |The state of the backlight pin when the backlight is "on" - `1` for high, `0` for low|
+| Define                 | Default       | Description                                                                                                       |
+|------------------------|---------------|-------------------------------------------------------------------------------------------------------------------|
+| `BACKLIGHT_PIN`        | *Not defined* | The pin that controls the LED(s)                                                                                  |
+| `BACKLIGHT_LEVELS`     | `3`           | The number of brightness levels (maximum 31 excluding off)                                                        |
+| `BACKLIGHT_CAPS_LOCK`  | *Not defined* | Enable Caps Lock indicator using backlight (for keyboards without dedicated LED)                                  |
+| `BACKLIGHT_BREATHING`  | *Not defined* | Enable backlight breathing, if supported                                                                          |
+| `BREATHING_PERIOD`     | `6`           | The length of one backlight "breath" in seconds                                                                   |
+| `BACKLIGHT_ON_STATE`   | `1`           | The state of the backlight pin when the backlight is "on" - `1` for high, `0` for low                             |
+| `BACKLIGHT_LIMIT_VAL ` | `255`         | The maximum duty cycle of the backlight -- `255` allows for full brightness, any lower will decrease the maximum. |
 
 Unless you are designing your own keyboard, you generally should not need to change the `BACKLIGHT_PIN` or `BACKLIGHT_ON_STATE`.
 
diff --git a/docs/feature_encoders.md b/docs/feature_encoders.md
index 8f9ba1a80a..e2cafdac48 100644
--- a/docs/feature_encoders.md
+++ b/docs/feature_encoders.md
@@ -32,13 +32,20 @@ Additionally, the resolution, which defines how many pulses the encoder register
 #define ENCODER_RESOLUTION 4
 ```
 
+It can also be defined per-encoder, by instead defining:
+
+```c
+#define ENCODER_RESOLUTIONS { 4, 2 }
+```
+
 ## Split Keyboards
 
-If you are using different pinouts for the encoders on each half of a split keyboard, you can define the pinout for the right half like this:
+If you are using different pinouts for the encoders on each half of a split keyboard, you can define the pinout (and optionally, resolutions) for the right half like this:
 
 ```c
 #define ENCODERS_PAD_A_RIGHT { encoder1a, encoder2a }
 #define ENCODERS_PAD_B_RIGHT { encoder1b, encoder2b }
+#define ENCODER_RESOLUTIONS_RIGHT { 2, 4 }
 ```
 
 ## Callbacks
diff --git a/docs/feature_haptic_feedback.md b/docs/feature_haptic_feedback.md
index ff7337a51a..64b66310b6 100644
--- a/docs/feature_haptic_feedback.md
+++ b/docs/feature_haptic_feedback.md
@@ -42,14 +42,21 @@ First you will need a build a circuit to drive the solenoid through a mosfet as
 [Wiring diagram provided by Adafruit](https://playground.arduino.cc/uploads/Learning/solenoid_driver.pdf)
 
 
-| Settings                 | Default       | Description                                           |
-|--------------------------|---------------|-------------------------------------------------------|
-|`SOLENOID_PIN`            | *Not defined* |Configures the pin that the Solenoid is connected to.  |
-|`SOLENOID_DEFAULT_DWELL`  | `12` ms       |Configures the default dwell time for the solenoid.    |
-|`SOLENOID_MIN_DWELL`      | `4` ms        |Sets the lower limit for the dwell.                    |
-|`SOLENOID_MAX_DWELL`      | `100` ms      |Sets the upper limit for the dwell.                    |
-
-?> Dwell time is how long the "plunger" stays activated.  The dwell time changes how the solenoid sounds.
+| Settings                   | Default              | Description                                           |
+|----------------------------|----------------------|-------------------------------------------------------|
+|`SOLENOID_PIN`              | *Not defined*        |Configures the pin that the Solenoid is connected to.  |
+|`SOLENOID_DEFAULT_DWELL`    | `12` ms              |Configures the default dwell time for the solenoid.    |
+|`SOLENOID_MIN_DWELL`        | `4` ms               |Sets the lower limit for the dwell.                    |
+|`SOLENOID_MAX_DWELL`        | `100` ms             |Sets the upper limit for the dwell.                    |
+|`SOLENOID_DWELL_STEP_SIZE`  | `1` ms               |The step size to use when `HPT_DWL*` keycodes are sent |
+|`SOLENOID_DEFAULT_BUZZ`     | `0` (disabled)       |On HPT_RST buzz is set "on" if this is "1"             |
+|`SOLENOID_BUZZ_ACTUATED`    | `SOLENOID_MIN_DWELL` |Actuated-time when the solenoid is in buzz mode        |
+|`SOLENOID_BUZZ_NONACTUATED` | `SOLENOID_MIN_DWELL` |Non-Actuated-time when the solenoid is in buzz mode    |
+
+* If solenoid buzz is off, then dwell time is how long the "plunger" stays activated. The dwell time changes how the solenoid sounds.
+* If solenoid buzz is on, then dwell time sets the length of the buzz, while `SOLENOID_BUZZ_ACTUATED` and `SOLENOID_BUZZ_NONACTUATED` set the (non-)actuation times withing the buzz period.
+* With the current implementation, for any of the above time settings, the precision of these settings may be affected by how fast the keyboard is able to scan the matrix.
+  Therefore, if the keyboards scanning routine is slow, it may be preferable to set `SOLENOID_DWELL_STEP_SIZE` to a value slightly smaller than the time it takes to scan the keyboard.
 
 Beware that some pins may be powered during bootloader (ie. A13 on the STM32F303 chip) and will result in the solenoid kept in the on state through the whole flashing process. This may overheat and damage the solenoid. If you find that the pin the solenoid is connected to is triggering the solenoid during bootloader/DFU, select another pin.
 
diff --git a/docs/feature_joystick.md b/docs/feature_joystick.md
index be3c781f6c..12bbf5b35e 100644
--- a/docs/feature_joystick.md
+++ b/docs/feature_joystick.md
@@ -141,6 +141,12 @@ bool process_record_user(uint16_t keycode, keyrecord_t *record) {
 }
 ```
 
+### Axis Resolution
+
+By default, the resolution of each axis is 8 bit, giving a range of -127 to +127. If you need higher precision, you can increase it by defining eg. `JOYSTICK_AXES_RESOLUTION 12` in your `config.h`. The resolution must be between 8 and 16.
+
+Note that the supported AVR MCUs have a 10-bit ADC, and 12-bit for most STM32 MCUs.
+
 ### Triggering Joystick Buttons
 
 Joystick buttons are normal Quantum keycodes, defined as `JS_BUTTON0` to `JS_BUTTON31`, depending on the number of buttons you have configured.
diff --git a/docs/feature_led_matrix.md b/docs/feature_led_matrix.md
index 372407b90c..a4e9d7eb83 100644
--- a/docs/feature_led_matrix.md
+++ b/docs/feature_led_matrix.md
@@ -10,7 +10,8 @@ If you want to use RGB LED's you should use the [RGB Matrix Subsystem](feature_r
 
 There is basic support for addressable LED matrix lighting with the I2C IS31FL3731 RGB controller. To enable it, add this to your `rules.mk`:
 
-    LED_MATRIX_ENABLE = IS31FL3731
+    LED_MATRIX_ENABLE = yes
+    LED_MATRIX_DRIVER = IS31FL3731
     
 You can use between 1 and 4 IS31FL3731 IC's. Do not specify `LED_DRIVER_ADDR_<N>` defines for IC's that are not present on your keyboard. You can define the following items in `config.h`:
 
diff --git a/docs/feature_mouse_keys.md b/docs/feature_mouse_keys.md
index a6b46bc151..ffde133892 100644
--- a/docs/feature_mouse_keys.md
+++ b/docs/feature_mouse_keys.md
@@ -140,3 +140,7 @@ To use constant speed mode, you must at least define `MK_COMBINED` in your keyma
 ```c
 #define MK_COMBINED
 ```
+
+## Use with PS/2 Mouse and Pointing Device
+
+Mouse keys button state is shared with [PS/2 mouse](feature_ps2_mouse.md) and [pointing device](feature_pointing_device.md) so mouse keys button presses can be used for clicks and drags.
diff --git a/docs/feature_oled_driver.md b/docs/feature_oled_driver.md
index 9f0ef1664b..44202487f1 100644
--- a/docs/feature_oled_driver.md
+++ b/docs/feature_oled_driver.md
@@ -150,6 +150,7 @@ void oled_task_user(void) {
 |`OLED_IC`                  |`OLED_IC_SSD1306`|Set to `OLED_IC_SH1106` if you're using the SH1106 OLED controller.                                                       |
 |`OLED_COLUMN_OFFSET`       |`0`              |(SH1106 only.) Shift output to the right this many pixels.<br />Useful for 128x64 displays centered on a 132x64 SH1106 IC.|
 |`OLED_BRIGHTNESS`          |`255`            |The default brightness level of the OLED, from 0 to 255.                                                                  |
+|`OLED_UPDATE_INTERVAL`     |`0`              |Set the time interval for updating the OLED display in ms. This will improve the matrix scan rate.                        |
 
  ## 128x64 & Custom sized OLED Displays
 
diff --git a/docs/feature_rgb_matrix.md b/docs/feature_rgb_matrix.md
index b70a5fcba0..f8b0653551 100644
--- a/docs/feature_rgb_matrix.md
+++ b/docs/feature_rgb_matrix.md
@@ -11,7 +11,8 @@ If you want to use single color LED's you should use the [LED Matrix Subsystem](
 There is basic support for addressable RGB matrix lighting with the I2C IS31FL3731 RGB controller. To enable it, add this to your `rules.mk`:
 
 ```makefile
-RGB_MATRIX_ENABLE = IS31FL3731
+RGB_MATRIX_ENABLE = yes
+RGB_MATRIX_DRIVER = IS31FL3731
 ```
 
 Configure the hardware via your `config.h`:
@@ -62,7 +63,8 @@ Where `Cx_y` is the location of the LED in the matrix defined by [the datasheet]
 There is basic support for addressable RGB matrix lighting with the I2C IS31FL3733 RGB controller. To enable it, add this to your `rules.mk`:
 
 ```makefile
-RGB_MATRIX_ENABLE = IS31FL3733
+RGB_MATRIX_ENABLE = yes
+RGB_MATRIX_DRIVER = IS31FL3733
 ```
 
 Configure the hardware via your `config.h`:
@@ -112,7 +114,8 @@ Where `X_Y` is the location of the LED in the matrix defined by [the datasheet](
 There is basic support for addressable RGB matrix lighting with a WS2811/WS2812{a,b,c} addressable LED strand. To enable it, add this to your `rules.mk`:
 
 ```makefile
-RGB_MATRIX_ENABLE = WS2812
+RGB_MATRIX_ENABLE = yes
+RGB_MATRIX_DRIVER = WS2812
 ```
 
 Configure the hardware via your `config.h`:
@@ -482,6 +485,14 @@ void rgb_matrix_indicators_kb(void) {
 }
 ```
 
+In addition, there are the advanced indicator functions.  These are aimed at those with heavily customized displays, where rendering every LED per cycle is expensive.  Such as some of the "drashna" layouts.  This includes a special macro to help make this easier to use: `RGB_MATRIX_INDICATOR_SET_COLOR(i, r, g, b)`.
+
+```c
+void rgb_matrix_indicators_advanced_user(uint8_t led_min, uint8_t led_max) {
+    RGB_MATRIX_INDICATOR_SET_COLOR(index, red, green, blue);
+}
+```
+
 ### Suspended state :id=suspended-state
 To use the suspend feature, make sure that `#define RGB_DISABLE_WHEN_USB_SUSPENDED true` is added to the `config.h` file. 
 
diff --git a/docs/feature_sequencer.md b/docs/feature_sequencer.md
new file mode 100644
index 0000000000..8c8587a9b8
--- /dev/null
+++ b/docs/feature_sequencer.md
@@ -0,0 +1,88 @@
+# Sequencer
+
+Since QMK has experimental support for MIDI, you can now turn your keyboard into a [step sequencer](https://en.wikipedia.org/wiki/Music_sequencer#Step_sequencers)!
+
+!> **IMPORTANT:** This feature is highly experimental, it has only been tested on a Planck EZ so far. Also, the scope will be limited to support the drum machine use-case to start with.
+
+## Enable the step sequencer
+
+Add the following line to your `rules.mk`:
+
+```make
+SEQUENCER_ENABLE = yes
+```
+
+By default the sequencer has 16 steps, but you can override this setting in your `config.h`:
+
+```c
+#define SEQUENCER_STEPS 32
+```
+
+## Tracks
+
+You can program up to 8 independent tracks with the step sequencer. Select the tracks you want to edit, enable or disable some steps, and start the sequence!
+
+## Resolutions
+
+While the tempo defines the absolute speed at which the sequencer goes through the steps, the resolution defines the granularity of these steps (from coarser to finer).
+
+|Resolution   |Description            |
+|----------   |-----------            |
+|`SQ_RES_2`   |Every other beat       |
+|`SQ_RES_2T`  |Every 1.5 beats        |
+|`SQ_RES_4`   |Every beat             |
+|`SQ_RES_4T`  |Three times per 2 beats|
+|`SQ_RES_8`   |Twice per beat         |
+|`SQ_RES_8T`  |Three times per beat   |
+|`SQ_RES_16`  |Four times per beat    |
+|`SQ_RES_16T` |Six times per beat     |
+|`SQ_RES_32`  |Eight times per beat   |
+
+## Keycodes
+
+|Keycode  |Description                                        |
+|-------  |-----------                                        |
+|`SQ_ON`  |Start the step sequencer                           |
+|`SQ_OFF` |Stop the step sequencer                            |
+|`SQ_TOG` |Toggle the step sequencer playback                 |
+|`SQ_SALL`|Enable all the steps                               |
+|`SQ_SCLR`|Disable all the steps                              |
+|`SQ_S(n)`|Toggle the step `n`                                |
+|`SQ_TMPD`|Decrease the tempo                                 |
+|`SQ_TMPU`|Increase the tempo                                 |
+|`SQ_R(n)`|Set the resolution to n                            |
+|`SQ_RESD`|Change to the slower resolution                    |
+|`SQ_RESU`|Change to the faster resolution                    |
+|`SQ_T(n)`|Set `n` as the only active track or deactivate all |
+
+## Functions
+
+|Function                                                             |Description                                            |
+|--------                                                             |-----------                                            |
+|`bool is_sequencer_on(void);`                                        |Return whether the sequencer is playing                |
+|`void sequencer_toggle(void);`                                       |Toggle the step sequencer playback                     |
+|`void sequencer_on(void);`                                           |Start the step sequencer                               |
+|`void sequencer_off(void);`                                          |Stop the step sequencer                                |
+|`bool is_sequencer_step_on(uint8_t step);`                           |Return whether the step is currently enabled           |
+|`void sequencer_set_step(uint8_t step, bool value);`                 |Enable or disable the step                             |
+|`void sequencer_set_step_on();`                                      |Enable the step                                        |
+|`void sequencer_set_step_off();`                                     |Disable the step                                       |
+|`void sequencer_toggle_step(uint8_t step);`                          |Toggle the step                                        |
+|`void sequencer_set_all_steps(bool value);`                          |Enable or disable all the steps                        |
+|`void sequencer_set_all_steps_on();`                                 |Enable all the steps                                   |
+|`void sequencer_set_all_steps_off();`                                |Disable all the steps                                  |
+|`uint8_t sequencer_get_tempo(void);`                                 |Return the current tempo                               |
+|`void sequencer_set_tempo(uint8_t tempo);`                           |Set the tempo to `tempo` (between 1 and 255)           |
+|`void sequencer_increase_tempo(void);`                               |Increase the tempo                                     |
+|`void sequencer_decrease_tempo(void);`                               |Decrease the tempo                                     |
+|`sequencer_resolution_t sequencer_get_resolution(void);`             |Return the current resolution                          |
+|`void sequencer_set_resolution(sequencer_resolution_t resolution);`  |Set the resolution to `resolution`                     |
+|`void sequencer_increase_resolution(void);`                          |Change to the faster resolution                        |
+|`void sequencer_decrease_resolution(void);`                          |Change to the slower resolution                        |
+|`bool is_sequencer_track_active(uint8_t track);`                     |Return whether the track is active                     |
+|`void sequencer_set_track_activation(uint8_t track, bool value);`    |Activate or deactivate the `track`                     |
+|`void sequencer_toggle_track_activation(uint8_t track);`             |Toggle the `track`                                     |
+|`void sequencer_activate_track(uint8_t track);`                      |Activate the `track`                                   |
+|`void sequencer_deactivate_track(uint8_t track);`                    |Deactivate the `track`                                 |
+|`void sequencer_toggle_single_active_track(uint8_t track);`          |Set `track` as the only active track or deactivate all |
+
diff --git a/docs/internals_gpio_control.md b/docs/internals_gpio_control.md
index 48eaf8875b..7c2228949b 100644
--- a/docs/internals_gpio_control.md
+++ b/docs/internals_gpio_control.md
@@ -21,3 +21,22 @@ The following functions can provide basic control of GPIOs and are found in `qua
 ## Advanced Settings :id=advanced-settings
 
 Each microcontroller can have multiple advanced settings regarding its GPIO. This abstraction layer does not limit the use of architecture-specific functions. Advanced users should consult the datasheet of their desired device and include any needed libraries. For AVR, the standard avr/io.h library is used; for STM32, the ChibiOS [PAL library](http://chibios.sourceforge.net/docs3/hal/group___p_a_l.html) is used.
+
+## Atomic Operation
+
+The above functions are not always guaranteed to work atomically. Therefore, if you want to prevent interruptions in the middle of operations when using multiple combinations of the above functions, use the following `ATOMIC_BLOCK_FORCEON` macro.
+
+eg.
+```c
+void some_function() {
+     // some process
+     ATOMIC_BLOCK_FORCEON {
+        // Atomic Processing
+     }
+     // some process
+}
+```
+
+`ATOMIC_BLOCK_FORCEON` forces interrupts to be disabled before the block is executed, without regard to whether they are enabled or disabled. Then, after the block is executed, the interrupt is enabled.
+
+Note that `ATOMIC_BLOCK_FORCEON` can therefore be used if you know that interrupts are enabled before the execution of the block, or if you know that it is OK to enable interrupts at the completion of the block.
diff --git a/docs/ja/feature_led_matrix.md b/docs/ja/feature_led_matrix.md
index b2595f9989..e7b60f594b 100644
--- a/docs/ja/feature_led_matrix.md
+++ b/docs/ja/feature_led_matrix.md
@@ -15,7 +15,8 @@ RGB LED を使いたい場合は、代わりに [RGB マトリックスサブシ
 
 I2C IS31FL3731 RGB コントローラを使ったアドレス指定可能な LED マトリックスライトのための基本的なサポートがあります:有効にするには、`rules.mk` に以下を追加します:
 
-    LED_MATRIX_ENABLE = IS31FL3731
+    LED_MATRIX_ENABLE = yes
+    LED_MATRIX_DRIVER = IS31FL3731
 
 1から4個の IS31FL3731 IC を使うことができます。キーボード上に存在しない IC の `LED_DRIVER_ADDR_<N>` 定義を指定しないでください。`config.h` に以下の項目を定義することができます:
 
diff --git a/docs/tap_hold.md b/docs/tap_hold.md
index 9ffbfde8fc..aacff40042 100644
--- a/docs/tap_hold.md
+++ b/docs/tap_hold.md
@@ -179,6 +179,25 @@ Holding and releasing a dual function key without pressing another key will resu
 
 For instance, holding and releasing `LT(2, KC_SPACE)` without hitting another key will result in nothing happening. With this enabled, it will send `KC_SPACE` instead.
 
+For more granular control of this feature, you can add the following to your `config.h`:
+
+```c
+#define RETRO_TAPPING_PER_KEY
+```
+
+You can then add the following function to your keymap:
+
+```c
+bool get_retro_tapping(uint16_t keycode, keyrecord_t *record) {
+    switch (keycode) {
+        case LT(2, KC_SPACE):
+            return true;
+        default:
+            return false;
+    }
+}
+```
+
 ## Why do we include the key record for the per key functions?
 
 One thing that you may notice is that we include the key record for all of the "per key" functions, and may be wondering why we do that.