[Core] Process all changed keys in one scan loop, deprecate `QMK_KEYS_PER_SCAN` (#15292)

96 files changed, 86 insertions, 603 deletions

diff --git a/data/mappings/info_config.json b/data/mappings/info_config.json
index 3891ef6437..d03f50c51e 100644
--- a/data/mappings/info_config.json
+++ b/data/mappings/info_config.json
@@ -82,7 +82,6 @@
     "VENDOR_ID": {"info_key": "usb.vid", "value_type": "hex"},
     "QMK_ESC_OUTPUT": {"info_key": "qmk_lufa_bootloader.esc_output"},
     "QMK_ESC_INPUT": {"info_key": "qmk_lufa_bootloader.esc_input"},
-    "QMK_KEYS_PER_SCAN": {"info_key": "qmk.keys_per_scan", "value_type": "int"},
     "QMK_LED": {"info_key": "qmk_lufa_bootloader.led"},
     "QMK_SPEAKER": {"info_key": "qmk_lufa_bootloader.speaker"},
     "SECURE_UNLOCK_SEQUENCE": {"info_key": "secure.unlock_sequence", "value_type": "array.array.int", "to_json": false},
@@ -114,4 +113,5 @@
     "DEBOUNCING_DELAY": {"info_key": "_invalid.debouncing_delay", "invalid": true},
     "PREVENT_STUCK_MODIFIERS": {"info_key": "_invalid.prevent_stuck_mods", "invalid": true},
     "RGBLIGHT_ANIMATIONS": {"info_key": "rgblight.animations.all", "value_type": "bool", "deprecated": true},
+    "QMK_KEYS_PER_SCAN": {"info_key": "qmk.keys_per_scan", "value_type": "int", "deprecated": true},
 }
diff --git a/docs/config_options.md b/docs/config_options.md
index f50748b950..c0a150e405 100644
--- a/docs/config_options.md
+++ b/docs/config_options.md
@@ -182,15 +182,6 @@ If you define these options you will enable the associated feature, which may in
   * how long before oneshot times out
 * `#define ONESHOT_TAP_TOGGLE 2`
   * how many taps before oneshot toggle is triggered
-* `#define QMK_KEYS_PER_SCAN 4`
-  * Allows sending more than one key per scan. By default, only one key event gets
-    sent via `process_record()` per scan. This has little impact on most typing, but
-    if you're doing a lot of chords, or your scan rate is slow to begin with, you can
-    have some delay in processing key events. Each press and release is a separate
-    event. For a keyboard with 1ms or so scan times, even a very fast typist isn't
-    going to produce the 500 keystrokes a second needed to actually get more than a
-    few ms of delay from this. But if you're doing chording on something with 3-4ms
-    scan times? You probably want this.
 * `#define COMBO_COUNT 2`
   * Set this to the number of combos that you're using in the [Combo](feature_combo.md) feature. Or leave it undefined and programmatically set the count.
 * `#define COMBO_TERM 200`
diff --git a/docs/ja/config_options.md b/docs/ja/config_options.md
index 5236230a10..c95753bd5d 100644
--- a/docs/ja/config_options.md
+++ b/docs/ja/config_options.md
@@ -181,8 +181,6 @@ QMK での全ての利用可能な設定にはデフォルトがあります。�
   * ワンショットがタイムアウトするまでの時間
 * `#define ONESHOT_TAP_TOGGLE 2`
   * ワンショットトグルが引き起こされるまでのタップ数
-* `#define QMK_KEYS_PER_SCAN 4`
-  * 走査ごとに1つ以上のキーを送信できるようにします。デフォルトでは、走査ごとに `process_record()` 経由で1つのキーイベントのみが送信されます。これはほとんどのタイピングにほとんど影響しませんが、多くのコードを入力しているか、走査レートが最初から遅い場合、キーイベントの処理に多少の遅延が生じる可能性があります。それぞれのプレスとリリースは別のイベントです。スキャン時間が 1ms 程度のキーボードの場合、とても高速なタイピストでさえ、実際にキーボードから数 ms 以上の遅延を発生させるのに必要な 500 キーストロークを1秒間に生成することはないでしょう。しかし、3～4ms の走査時間でコードを入力している場合はどうでしょうか？おそらくこれが必要です。
 * `#define COMBO_COUNT 2`
   * [コンボ](ja/feature_combo.md)機能で使っているコンボの数にこれを設定します。
 * `#define COMBO_TERM 200`
diff --git a/keyboards/40percentclub/gherkin/keymaps/stevexyz/config.h b/keyboards/40percentclub/gherkin/keymaps/stevexyz/config.h
index c708babf16..d837be8ba1 100644
--- a/keyboards/40percentclub/gherkin/keymaps/stevexyz/config.h
+++ b/keyboards/40percentclub/gherkin/keymaps/stevexyz/config.h
@@ -39,8 +39,6 @@
         // how long before oneshot times out
     #define ONESHOT_TAP_TOGGLE 2
         // how many taps before oneshot toggle is triggered
-    #define QMK_KEYS_PER_SCAN 4
-        // Allows sending more than one key per scan. By default, only one key event gets sent via process_record() per scan. This has little impact on most typing, but if you're doing a lot of chords, or your scan rate is slow to begin with, you can have some delay in processing key events. Each press and release is a separate event. For a keyboard with 1ms or so scan times, even a very fast typist isn't going to produce the 500 keystrokes a second needed to actually get more than a few ms of delay from this. But if you're doing chording on something with 3-4ms scan times? You probably want this.
     #define COMBO_COUNT 2
         // Set this to the number of combos that you're using in the Combo feature.
     #define COMBO_TERM 200
diff --git a/keyboards/ai03/jp60/keymaps/default/config.h b/keyboards/ai03/jp60/keymaps/default/config.h
deleted file mode 100644
index 9e0623524a..0000000000
--- a/keyboards/ai03/jp60/keymaps/default/config.h
+++ /dev/null
@@ -1,20 +0,0 @@
-/* Copyright 2021 ai03
- *
- * This program is free software: you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation, either version 2 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program.  If not, see <http://www.gnu.org/licenses/>.
- */
-
-#pragma once
-
-/* Increase scan quantity for improved performance */
-#define QMK_KEYS_PER_SCAN 12
diff --git a/keyboards/ai03/jp60/keymaps/via/config.h b/keyboards/ai03/jp60/keymaps/via/config.h
deleted file mode 100644
index 9e0623524a..0000000000
--- a/keyboards/ai03/jp60/keymaps/via/config.h
+++ /dev/null
@@ -1,20 +0,0 @@
-/* Copyright 2021 ai03
- *
- * This program is free software: you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation, either version 2 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program.  If not, see <http://www.gnu.org/licenses/>.
- */
-
-#pragma once
-
-/* Increase scan quantity for improved performance */
-#define QMK_KEYS_PER_SCAN 12
diff --git a/keyboards/bioi/morgan65/config.h b/keyboards/bioi/morgan65/config.h
index e4ad58c3a7..2ce3c7a56b 100644
--- a/keyboards/bioi/morgan65/config.h
+++ b/keyboards/bioi/morgan65/config.h
@@ -37,8 +37,6 @@ along with this program. If not, see <http://www.gnu.org/licenses/>.
 #define MATRIX_ROW_PINS { E6, C6, F4, B2, D4 }
 #define MATRIX_COL_PINS { F5, F6, F7, C7, B0, B7, B5, D5, B4, D7, D6, D1, D0, B3 }
 
-//#define QMK_KEYS_PER_SCAN 4
-
 /* Backlight Setup */
 #define BACKLIGHT_PIN B6
 #define BACKLIGHT_LEVELS 12
diff --git a/keyboards/doio/kb16/config.h b/keyboards/doio/kb16/config.h
index 043a492006..911ba9d3d5 100644
--- a/keyboards/doio/kb16/config.h
+++ b/keyboards/doio/kb16/config.h
@@ -39,9 +39,6 @@
 /* Forcing to use NKRO instead 6KRO */
 #define FORCE_NKRO
 
-/* Larger keys per scan */
-#define QMK_KEYS_PER_SCAN 12
-
 /* Use the custom font */
 #define OLED_FONT_H "lib/glcdfont.c"
 
diff --git a/keyboards/dztech/dz60rgb/keymaps/kgreulich/config.h b/keyboards/dztech/dz60rgb/keymaps/kgreulich/config.h
index fc836b5ebb..e3250acef1 100644
--- a/keyboards/dztech/dz60rgb/keymaps/kgreulich/config.h
+++ b/keyboards/dztech/dz60rgb/keymaps/kgreulich/config.h
@@ -7,8 +7,6 @@
 #define TAP_HOLD_CAPS_DELAY 0
 #define USB_POLLING_INTERVAL_MS 1
 
-#define QMK_KEYS_PER_SCAN 4
-
 // some speed shit
 #define NO_ACTION_MACRO
 #define NO_ACTION_FUNCTION
diff --git a/keyboards/dztech/dz60rgb/keymaps/matthewrobo/config.h b/keyboards/dztech/dz60rgb/keymaps/matthewrobo/config.h
index c2b14f5284..ca64eeb69b 100644
--- a/keyboards/dztech/dz60rgb/keymaps/matthewrobo/config.h
+++ b/keyboards/dztech/dz60rgb/keymaps/matthewrobo/config.h
@@ -51,8 +51,6 @@
 // #undef ENABLE_RGB_MATRIX_SOLID_SPLASH
 // #undef ENABLE_RGB_MATRIX_SOLID_MULTISPLASH
 
-#define QMK_KEYS_PER_SCAN 4
-
 // #define RGB_MATRIX_KEYRELEASES
 
 // some speed shit
diff --git a/keyboards/dztech/dz60rgb/keymaps/xunz/config.h b/keyboards/dztech/dz60rgb/keymaps/xunz/config.h
index cfeba003bd..2fdb3e5f4c 100644
--- a/keyboards/dztech/dz60rgb/keymaps/xunz/config.h
+++ b/keyboards/dztech/dz60rgb/keymaps/xunz/config.h
@@ -46,8 +46,6 @@
 // #undef ENABLE_RGB_MATRIX_SOLID_SPLASH
 // #undef ENABLE_RGB_MATRIX_SOLID_MULTISPLASH
 
-#define QMK_KEYS_PER_SCAN 4
-
 // #define RGB_MATRIX_KEYRELEASES
 
 #define NO_ACTION_ONESHOT
diff --git a/keyboards/dztech/dz65rgb/keymaps/matthewrobo/config.h b/keyboards/dztech/dz65rgb/keymaps/matthewrobo/config.h
index 586e5765aa..25842ac186 100644
--- a/keyboards/dztech/dz65rgb/keymaps/matthewrobo/config.h
+++ b/keyboards/dztech/dz65rgb/keymaps/matthewrobo/config.h
@@ -47,8 +47,6 @@
 // #undef ENABLE_RGB_MATRIX_SOLID_SPLASH
 // #undef ENABLE_RGB_MATRIX_SOLID_MULTISPLASH
 
-#define QMK_KEYS_PER_SCAN 4
-
 // #define RGB_MATRIX_KEYRELEASES
 
 // some speed shit
diff --git a/keyboards/dztech/dz65rgb/keymaps/yuannan/config.h b/keyboards/dztech/dz65rgb/keymaps/yuannan/config.h
index 0a005cbca3..ef5023f8c6 100644
--- a/keyboards/dztech/dz65rgb/keymaps/yuannan/config.h
+++ b/keyboards/dztech/dz65rgb/keymaps/yuannan/config.h
@@ -30,8 +30,6 @@
 #define RGB_MATRIX_VAL_STEP 8
 #define RGB_MATRIX_SPD_STEP 8
 
-//#define QMK_KEYS_PER_SCAN 12nn
-