Adds support for STM32L412xB, STM32L422xB. (#13383)

* Adds support for STM32L412xB, STM32L422xB.

* Add to list of supported MCUs.

* Disable SPI1 by default.

11 files changed, 467 insertions, 3 deletions

diff --git a/data/schemas/keyboard.jsonschema b/data/schemas/keyboard.jsonschema
index d6d33ce4ec..3a77b20678 100644
--- a/data/schemas/keyboard.jsonschema
+++ b/data/schemas/keyboard.jsonschema
@@ -13,7 +13,7 @@
         },
         "processor": {
             "type": "string",
-            "enum": ["cortex-m0", "cortex-m0plus", "cortex-m3", "cortex-m4", "MKL26Z64", "MK20DX128", "MK20DX256", "MK66F18", "STM32F042", "STM32F072", "STM32F103", "STM32F303", "STM32F401", "STM32F411", "STM32F446", "STM32G431", "STM32G474", "STM32L433", "STM32L443", "atmega16u2", "atmega32u2", "atmega16u4", "atmega32u4", "at90usb162", "at90usb646", "at90usb647", "at90usb1286", "at90usb1287", "atmega32a", "atmega328p", "atmega328", "attiny85", "unknown"]
+            "enum": ["cortex-m0", "cortex-m0plus", "cortex-m3", "cortex-m4", "MKL26Z64", "MK20DX128", "MK20DX256", "MK66F18", "STM32F042", "STM32F072", "STM32F103", "STM32F303", "STM32F401", "STM32F411", "STM32F446", "STM32G431", "STM32G474", "STM32L412", "STM32L422", "STM32L433", "STM32L443", "atmega16u2", "atmega32u2", "atmega16u4", "atmega32u4", "at90usb162", "at90usb646", "at90usb647", "at90usb1286", "at90usb1287", "atmega32a", "atmega328p", "atmega328", "attiny85", "unknown"]
         },
         "board": {
             "type": "string",
diff --git a/docs/compatible_microcontrollers.md b/docs/compatible_microcontrollers.md
index 0f5b140de0..865b29feec 100644
--- a/docs/compatible_microcontrollers.md
+++ b/docs/compatible_microcontrollers.md
@@ -31,6 +31,8 @@ You can also use any ARM chip with USB that [ChibiOS](https://www.chibios.org) s
  * [STM32F446](https://www.st.com/en/microcontrollers-microprocessors/stm32f446.html)
  * [STM32G431](https://www.st.com/en/microcontrollers-microprocessors/stm32g4x1.html)
  * [STM32G474](https://www.st.com/en/microcontrollers-microprocessors/stm32g4x4.html)
+ * [STM32L412](https://www.st.com/en/microcontrollers-microprocessors/stm32l4x2.html)
+ * [STM32L422](https://www.st.com/en/microcontrollers-microprocessors/stm32l4x2.html)
  * [STM32L433](https://www.st.com/en/microcontrollers-microprocessors/stm32l4x3.html)
  * [STM32L443](https://www.st.com/en/microcontrollers-microprocessors/stm32l4x3.html)
 
diff --git a/docs/ja/compatible_microcontrollers.md b/docs/ja/compatible_microcontrollers.md
index b675b038d2..761a4cda46 100644
--- a/docs/ja/compatible_microcontrollers.md
+++ b/docs/ja/compatible_microcontrollers.md
@@ -36,6 +36,8 @@ QMK は十分な容量のフラッシュメモリを備えた USB 対応 AVR ま
 * [STM32F446](https://www.st.com/en/microcontrollers-microprocessors/stm32f446.html)
 * [STM32G431](https://www.st.com/en/microcontrollers-microprocessors/stm32g4x1.html)
 * [STM32G474](https://www.st.com/en/microcontrollers-microprocessors/stm32g4x4.html)
+* [STM32L412](https://www.st.com/en/microcontrollers-microprocessors/stm32l4x2.html)
+* [STM32L422](https://www.st.com/en/microcontrollers-microprocessors/stm32l4x2.html)
 * [STM32L433](https://www.st.com/en/microcontrollers-microprocessors/stm32l4x3.html)
 * [STM32L443](https://www.st.com/en/microcontrollers-microprocessors/stm32l4x3.html)
 
diff --git a/lib/python/qmk/constants.py b/lib/python/qmk/constants.py
index 49e5e0eb42..be5ce5d4ed 100644
--- a/lib/python/qmk/constants.py
+++ b/lib/python/qmk/constants.py
@@ -10,7 +10,7 @@ QMK_FIRMWARE = Path.cwd()
 MAX_KEYBOARD_SUBFOLDERS = 5
 
 # Supported processor types
-CHIBIOS_PROCESSORS = 'cortex-m0', 'cortex-m0plus', 'cortex-m3', 'cortex-m4', 'MKL26Z64', 'MK20DX128', 'MK20DX256', 'MK66F18', 'STM32F042', 'STM32F072', 'STM32F103', 'STM32F303', 'STM32F401', 'STM32F411', 'STM32F446', 'STM32G431', 'STM32G474', 'STM32L433', 'STM32L443'
+CHIBIOS_PROCESSORS = 'cortex-m0', 'cortex-m0plus', 'cortex-m3', 'cortex-m4', 'MKL26Z64', 'MK20DX128', 'MK20DX256', 'MK66F18', 'STM32F042', 'STM32F072', 'STM32F103', 'STM32F303', 'STM32F401', 'STM32F411', 'STM32F446', 'STM32G431', 'STM32G474', 'STM32L412', 'STM32L422', 'STM32L433', 'STM32L443'
 LUFA_PROCESSORS = 'at90usb162', 'atmega16u2', 'atmega32u2', 'atmega16u4', 'atmega32u4', 'at90usb646', 'at90usb647', 'at90usb1286', 'at90usb1287', None
 VUSB_PROCESSORS = 'atmega32a', 'atmega328p', 'atmega328', 'attiny85'
 
diff --git a/platforms/chibios/GENERIC_STM32_L412XB/board/board.mk b/platforms/chibios/GENERIC_STM32_L412XB/board/board.mk
new file mode 100644
index 0000000000..1250385eb8
--- /dev/null
+++ b/platforms/chibios/GENERIC_STM32_L412XB/board/board.mk
@@ -0,0 +1,9 @@
+# List of all the board related files.
+BOARDSRC = $(CHIBIOS)/os/hal/boards/ST_NUCLEO32_L432KC/board.c
+
+# Required include directories
+BOARDINC = $(CHIBIOS)/os/hal/boards/ST_NUCLEO32_L432KC
+
+# Shared variables
+ALLCSRC += $(BOARDSRC)
+ALLINC  += $(BOARDINC)
diff --git a/platforms/chibios/GENERIC_STM32_L412XB/configs/board.h b/platforms/chibios/GENERIC_STM32_L412XB/configs/board.h
new file mode 100644
index 0000000000..2e37d95fe3
--- /dev/null
+++ b/platforms/chibios/GENERIC_STM32_L412XB/configs/board.h
@@ -0,0 +1,24 @@
+/* Copyright 2018-2021 Harrison Chan (@Xelus)
+ *
+ *  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 3 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 <https://www.gnu.org/licenses/>.
+ */
+#pragma once
+
+#include_next "board.h"
+
+#undef STM32L432xx
+
+// Pretend that we're an L443xx as the ChibiOS definitions for L4x2/L4x3 mistakenly don't enable GPIOH, I2C2, or SPI2.
+// Until ChibiOS upstream is fixed, this should be kept at L443, as nothing in QMK currently utilises the crypto peripheral on the L443.
+#define STM32L443xx
diff --git a/platforms/chibios/GENERIC_STM32_L412XB/configs/config.h b/platforms/chibios/GENERIC_STM32_L412XB/configs/config.h
new file mode 100644
index 0000000000..c27c61b19a
--- /dev/null
+++ b/platforms/chibios/GENERIC_STM32_L412XB/configs/config.h
@@ -0,0 +1,26 @@
+/* Copyright 2018-2021 Harrison Chan (@Xelus)
+ *
+ * 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/>.
+ */
+
+/* Address for jumping to bootloader on STM32 chips. */
+/* It is chip dependent, the correct number can be looked up by checking against ST's application note AN2606.
+ */
+#define STM32_BOOTLOADER_ADDRESS 0x1FFF0000
+
+#define PAL_STM32_OSPEED_HIGHEST PAL_STM32_OSPEED_HIGH
+
+#ifndef EARLY_INIT_PERFORM_BOOTLOADER_JUMP
+#    define EARLY_INIT_PERFORM_BOOTLOADER_JUMP TRUE
+#endif
diff --git a/platforms/chibios/GENERIC_STM32_L412XB/configs/mcuconf.h b/platforms/chibios/GENERIC_STM32_L412XB/configs/mcuconf.h
new file mode 100644
index 0000000000..8ad5a8da21
--- /dev/null
+++ b/platforms/chibios/GENERIC_STM32_L412XB/configs/mcuconf.h
@@ -0,0 +1,282 @@
+/*
+    ChibiOS - Copyright (C) 2006..2018 Giovanni Di Sirio
+
+    Licensed under the Apache License, Version 2.0 (the "License");
+    you may not use this file except in compliance with the License.
+    You may obtain a copy of the License at
+
+        http://www.apache.org/licenses/LICENSE-2.0
+
+    Unless required by applicable law or agreed to in writing, software
+    distributed under the License is distributed on an "AS IS" BASIS,
+    WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+    See the License for the specific language governing permissions and
+    limitations under the License.
+*/
+
+/*
+ * STM32L4xx drivers configuration.
+ * The following settings override the default settings present in
+ * the various device driver implementation headers.
+ * Note that the settings for each driver only have effect if the whole
+ * driver is enabled in halconf.h.
+ *
+ * IRQ priorities:
+ * 15...0       Lowest...Highest.
+ *
+ * DMA priorities:
+ * 0...3        Lowest...Highest.
+ */
+
+#ifndef MCUCONF_H
+#define MCUCONF_H
+
+#define STM32L4xx_MCUCONF
+#define STM32L412_MCUCONF
+#define STM32L422_MCUCONF
+#define STM32L432_MCUCONF
+#define STM32L433_MCUCONF
+#define STM32L442_MCUCONF
+#define STM32L443_MCUCONF
+
+/*
+ * HAL driver system settings.
+ */
+#define STM32_NO_INIT                       FALSE
+#define STM32_VOS                           STM32_VOS_RANGE1
+#define STM32_PVD_ENABLE                    FALSE
+#define STM32_PLS                           STM32_PLS_LEV0
+#define STM32_HSI16_ENABLED                 TRUE
+#define STM32_HSI48_ENABLED                 TRUE
+#define STM32_LSI_ENABLED                   FALSE
+#define STM32_HSE_ENABLED                   FALSE
+#define STM32_LSE_ENABLED                   FALSE
+#define STM32_MSIPLL_ENABLED                FALSE
+#define STM32_ADC_CLOCK_ENABLED             TRUE
+#define STM32_USB_CLOCK_ENABLED             TRUE
+#define STM32_SAI1_CLOCK_ENABLED            TRUE
+#define STM32_SAI2_CLOCK_ENABLED            TRUE
+#define STM32_MSIRANGE                      STM32_MSIRANGE_4M
+#define STM32_MSISRANGE                     STM32_MSISRANGE_4M
+#define STM32_SW                            STM32_SW_PLL
+#define STM32_PLLSRC                        STM32_PLLSRC_HSI16
+#define STM32_PLLM_VALUE                    4
+#define STM32_PLLN_VALUE                    80
+#define STM32_PLLP_VALUE                    7
+#define STM32_PLLQ_VALUE                    4
+#define STM32_PLLR_VALUE                    4
+#define STM32_HPRE                          STM32_HPRE_DIV1
+#define STM32_PPRE1                         STM32_PPRE1_DIV1
+#define STM32_PPRE2                         STM32_PPRE2_DIV1
+#define STM32_STOPWUCK                      STM32_STOPWUCK_MSI
+#define STM32_MCOSEL                        STM32_MCOSEL_NOCLOCK
+#define STM32_MCOPRE                        STM32_MCOPRE_DIV1
+#define STM32_LSCOSEL                       STM32_LSCOSEL_NOCLOCK
+#define STM32_PLLSAI1N_VALUE                72
+#define STM32_PLLSAI1P_VALUE                7
+#define STM32_PLLSAI1Q_VALUE                6
+#define STM32_PLLSAI1R_VALUE                6
+#define STM32_PLLSAI2N_VALUE                72
+#define STM32_PLLSAI2P_VALUE                7
+#define STM32_PLLSAI2R_VALUE                6
+
+/*
+ * Peripherals clock sources.
+ */
+#define STM32_USART1SEL                     STM32_USART1SEL_SYSCLK
+#define STM32_USART2SEL                     STM32_USART2SEL_SYSCLK
+#define STM32_USART3SEL                     STM32_USART3SEL_SYSCLK
+#define STM32_UART4SEL                      STM32_UART4SEL_SYSCLK
+#define STM32_UART5SEL                      STM32_UART5SEL_SYSCLK
+#define STM32_LPUART1SEL                    STM32_LPUART1SEL_SYSCLK
+#define STM32_I2C1SEL                       STM32_I2C1SEL_SYSCLK
+#define STM32_I2C2SEL                       STM32_I2C2SEL_SYSCLK
+#define STM32_I2C3SEL                       STM32_I2C3SEL_SYSCLK
+#define STM32_LPTIM1SEL                     STM32_LPTIM1SEL_PCLK1
+#define STM32_LPTIM2SEL                     STM32_LPTIM2SEL_PCLK1
+#define STM32_SAI1SEL                       STM32_SAI1SEL_OFF
+#define STM32_SAI2SEL                       STM32_SAI2SEL_OFF
+#define STM32_CLK48SEL                      STM32_CLK48SEL_HSI48
+#define STM32_ADCSEL                        STM32_ADCSEL_SYSCLK
+#define STM32_SWPMI1SEL                     STM32_SWPMI1SEL_PCLK1
+#define STM32_RTCSEL                        STM32_RTCSEL_LSI
+
+/*
+ * IRQ system settings.
+ */
+#define STM32_IRQ_EXTI0_PRIORITY            6
+#define STM32_IRQ_EXTI1_PRIORITY            6
+#define STM32_IRQ_EXTI2_PRIORITY            6
+#define STM32_IRQ_EXTI3_PRIORITY            6
+#define STM32_IRQ_EXTI4_PRIORITY            6
+#define STM32_IRQ_EXTI5_9_PRIORITY          6
+#define STM32_IRQ_EXTI10_15_PRIORITY        6
+#define STM32_IRQ_EXTI1635_38_PRIORITY      6
+#define STM32_IRQ_EXTI18_PRIORITY           6
+#define STM32_IRQ_EXTI19_PRIORITY           6
+#define STM32_IRQ_EXTI20_PRIORITY           6
+#define STM32_IRQ_EXTI21_22_PRIORITY        15
+
+#define STM32_IRQ_TIM1_BRK_TIM15_PRIORITY   7
+#define STM32_IRQ_TIM1_UP_TIM16_PRIORITY    7
+#define STM32_IRQ_TIM1_TRGCO_TIM17_PRIORITY 7
+#define STM32_IRQ_TIM1_CC_PRIORITY          7
+#define STM32_IRQ_TIM2_PRIORITY             7
+#define STM32_IRQ_TIM6_PRIORITY             7
+#define STM32_IRQ_TIM7_PRIORITY             7
+
+#define STM32_IRQ_USART1_PRIORITY           12
+#define STM32_IRQ_USART2_PRIORITY           12
+#define STM32_IRQ_USART3_PRIORITY           12
+#define STM32_IRQ_LPUART1_PRIORITY          12
+
+/*
+ * ADC driver system settings.
+ */
+#define STM32_ADC_COMPACT_SAMPLES           FALSE
+#define STM32_ADC_USE_ADC1                  FALSE
+#define STM32_ADC_ADC1_DMA_STREAM           STM32_DMA_STREAM_ID(1, 1)
+#define STM32_ADC_ADC1_DMA_PRIORITY         2
+#define STM32_ADC_ADC12_IRQ_PRIORITY        5
+#define STM32_ADC_ADC1_DMA_IRQ_PRIORITY     5
+#define STM32_ADC_ADC123_CLOCK_MODE         ADC_CCR_CKMODE_AHB_DIV1
+#define STM32_ADC_ADC123_PRESC              ADC_CCR_PRESC_DIV2
+
+/*
+ * CAN driver system settings.
+ */
+#define STM32_CAN_USE_CAN1                  FALSE
+#define STM32_CAN_CAN1_IRQ_PRIORITY         11
+
+/*
+ * DAC driver system settings.
+ */
+#define STM32_DAC_DUAL_MODE                 FALSE
+#define STM32_DAC_USE_DAC1_CH1              FALSE
+#define STM32_DAC_USE_DAC1_CH2              FALSE
+#define STM32_DAC_DAC1_CH1_IRQ_PRIORITY     10
+#define STM32_DAC_DAC1_CH2_IRQ_PRIORITY     10
+#define STM32_DAC_DAC1_CH1_DMA_PRIORITY     2
+#define STM32_DAC_DAC1_CH2_DMA_PRIORITY     2
+#define STM32_DAC_DAC1_CH1_DMA_STREAM       STM32_DMA_STREAM_ID(2, 4)
+#define STM32_DAC_DAC1_CH2_DMA_STREAM       STM32_DMA_STREAM_ID(1, 4)
+
+/*
+ * GPT driver system settings.
+ */
+#define STM32_GPT_USE_TIM1                  FALSE
+#define STM32_GPT_USE_TIM2                  FALSE
+#define STM32_GPT_USE_TIM6                  FALSE
+#define STM32_GPT_USE_TIM7                  FALSE
+#define STM32_GPT_USE_TIM15                 FALSE
+#define STM32_GPT_USE_TIM16                 FALSE
+
+/*
+ * I2C driver system settings.
+ */
+#define STM32_I2C_USE_I2C1                  FALSE
+#define STM32_I2C_USE_I2C3                  FALSE
+#define STM32_I2C_BUSY_TIMEOUT              50
+#define STM32_I2C_I2C1_RX_DMA_STREAM        STM32_DMA_STREAM_ID(1, 7)
+#define STM32_I2C_I2C1_TX_DMA_STREAM        STM32_DMA_STREAM_ID(1, 6)
+#define STM32_I2C_I2C3_RX_DMA_STREAM        STM32_DMA_STREAM_ID(1, 3)
+#define STM32_I2C_I2C3_TX_DMA_STREAM        STM32_DMA_STREAM_ID(1, 2)
+#define STM32_I2C_I2C1_IRQ_PRIORITY         5
+#define STM32_I2C_I2C3_IRQ_PRIORITY         5
+#define STM32_I2C_I2C1_DMA_PRIORITY         3
+#define STM32_I2C_I2C3_DMA_PRIORITY         3
+#define STM32_I2C_DMA_ERROR_HOOK(i2cp)      osalSysHalt("DMA failure")
+
+/*
+ * ICU driver system settings.
+ */
+#define STM32_ICU_USE_TIM1                  FALSE
+#define STM32_ICU_USE_TIM2                  FALSE
+#define STM32_ICU_USE_TIM15                 FALSE
+#define STM32_ICU_USE_TIM16                 FALSE
+
+/*
+ * PWM driver system settings.
+ */
+#define STM32_PWM_USE_ADVANCED              FALSE
+#define STM32_PWM_USE_TIM1                  FALSE
+#define STM32_PWM_USE_TIM2                  FALSE
+#define STM32_PWM_USE_TIM15                 FALSE
+#define STM32_PWM_USE_TIM16                 FALSE
+
+/*
+ * RTC driver system settings.
+ */
+#define STM32_RTC_PRESA_VALUE               32
+#define STM32_RTC_PRESS_VALUE               1024
+#define STM32_RTC_CR_INIT                   0
+#define STM32_RTC_TAMPCR_INIT               0
+
+/*
+ * SERIAL driver system settings.
+ */
+#define STM32_SERIAL_USE_USART1             FALSE
+#define STM32_SERIAL_USE_USART2             FALSE
+#define STM32_SERIAL_USE_LPUART1            FALSE
+#define STM32_SERIAL_USART1_PRIORITY        12
+#define STM32_SERIAL_USART2_PRIORITY        12
+#define STM32_SERIAL_LPUART1_PRIORITY       12
+
+/*
+ * SPI driver system settings.
+ */
+#define STM32_SPI_USE_SPI1                  FALSE
+#define STM32_SPI_USE_SPI3                  FALSE
+#define STM32_SPI_SPI1_RX_DMA_STREAM        STM32_DMA_STREAM_ID(2, 3)
+#define STM32_SPI_SPI1_TX_DMA_STREAM        STM32_DMA_STREAM_ID(2, 4)
+#define STM32_SPI_SPI3_RX_DMA_STREAM        STM32_DMA_STREAM_ID(2, 1)
+#define STM32_SPI_SPI3_TX_DMA_STREAM        STM32_DMA_STREAM_ID(2, 2)
+#define STM32_SPI_SPI1_DMA_PRIORITY         1
+#define STM32_SPI_SPI3_DMA_PRIORITY         1
+#define STM32_SPI_SPI1_IRQ_PRIORITY         10
+#define STM32_SPI_SPI3_IRQ_PRIORITY         10
+#define STM32_SPI_DMA_ERROR_HOOK(spip)      osalSysHalt("DMA failure")
+
+/*
+ * ST driver system settings.
+ */
+#define STM32_ST_IRQ_PRIORITY               8
+#define STM32_ST_USE_TIMER                  2
+
+/*
+ * TRNG driver system settings.
+ */
+#define STM32_TRNG_USE_RNG1                 FALSE
+
+/*
+ * UART driver system settings.
+ */
+#define STM32_UART_USE_USART1               FALSE
+#define STM32_UART_USE_USART2               FALSE
+#define STM32_UART_USART1_RX_DMA_STREAM     STM32_DMA_STREAM_ID(2, 7)
+#define STM32_UART_USART1_TX_DMA_STREAM     STM32_DMA_STREAM_ID(2, 6)
+#define STM32_UART_USART2_RX_DMA_STREAM     STM32_DMA_STREAM_ID(1, 6)
+#define STM32_UART_USART2_TX_DMA_STREAM     STM32_DMA_STREAM_ID(1, 7)
+#define STM32_UART_DMA_ERROR_HOOK(uartp)    osalSysHalt("DMA failure")
+
+/*
+ * USB driver system settings.
+ */
+#define STM32_USB_USE_USB1                  TRUE
+#define STM32_USB_LOW_POWER_ON_SUSPEND      FALSE
+#define STM32_USB_USB1_HP_IRQ_PRIORITY      13
+#define STM32_USB_USB1_LP_IRQ_PRIORITY      14
+
+/*
+ * WDG driver system settings.
+ */
+#define STM32_WDG_USE_IWDG                  FALSE
+
+/*
+ * WSPI driver system settings.
+ */
+#define STM32_WSPI_USE_QUADSPI1             FALSE
+#define STM32_WSPI_QUADSPI1_DMA_STREAM      STM32_DMA_STREAM_ID(2, 7)
+#define STM32_WSPI_QUADSPI1_PRESCALER_VALUE 1
+
+#endif /* MCUCONF_H */
diff --git a/platforms/chibios/GENERIC_STM32_L433XC/configs/board.h b/platforms/chibios/GENERIC_STM32_L433XC/configs/board.h
index 51f9724f94..2e37d95fe3 100644
--- a/platforms/chibios/GENERIC_STM32_L433XC/configs/board.h
+++ b/platforms/chibios/GENERIC_STM32_L433XC/configs/board.h
@@ -19,6 +19,6 @@
 
 #undef STM32L432xx
 
-// Pretend that we're an L443xx as the ChibiOS definitions for L432/L433 mistakenly don't enable GPIOH, I2C2, or SPI2.
+// Pretend that we're an L443xx as the ChibiOS definitions for L4x2/L4x3 mistakenly don't enable GPIOH, I2C2, or SPI2.
 // Until ChibiOS upstream is fixed, this should be kept at L443, as nothing in QMK currently utilises the crypto peripheral on the L443.
 #define STM32L443xx
diff --git a/platforms/chibios/common/ld/STM32L412xB.ld b/platforms/chibios/common/ld/STM32L412xB.ld
new file mode 100644
index 0000000000..5718d6bc71
--- /dev/null
+++ b/platforms/chibios/common/ld/STM32L412xB.ld
@@ -0,0 +1,85 @@
+/*
+    ChibiOS - Copyright (C) 2006..2016 Giovanni Di Sirio
+
+    Licensed under the Apache License, Version 2.0 (the "License");
+    you may not use this file except in compliance with the License.
+    You may obtain a copy of the License at
+
+        http://www.apache.org/licenses/LICENSE-2.0
+
+    Unless required by applicable law or agreed to in writing, software
+    distributed under the License is distributed on an "AS IS" BASIS,
+    WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+    See the License for the specific language governing permissions and
+    limitations under the License.
+*/
+
+/*
+ * STM32L412xB memory setup.
+ */
+MEMORY
+{
+    flash0  : org = 0x08000000, len = 128k
+    flash1  : org = 0x00000000, len = 0
+    flash2  : org = 0x00000000, len = 0
+    flash3  : org = 0x00000000, len = 0
+    flash4  : org = 0x00000000, len = 0
+    flash5  : org = 0x00000000, len = 0
+    flash6  : org = 0x00000000, len = 0
+    flash7  : org = 0x00000000, len = 0
+    ram0    : org = 0x20000000, len = 32k
+    ram1    : org = 0x00000000, len = 0
+    ram2    : org = 0x00000000, len = 0
+    ram3    : org = 0x00000000, len = 0
+    ram4    : org = 0x00000000, len = 0
+    ram5    : org = 0x00000000, len = 0
+    ram6    : org = 0x00000000, len = 0
+    ram7    : org = 0x00000000, len = 0
+}
+
+/* For each data/text section two region are defined, a virtual region
+   and a load region (_LMA suffix).*/
+
+/* Flash region to be used for exception vectors.*/
+REGION_ALIAS("VECTORS_FLASH", flash0);
+REGION_ALIAS("VECTORS_FLASH_LMA", flash0);
+
+/* Flash region to be used for constructors and destructors.*/
+REGION_ALIAS("XTORS_FLASH", flash0);
+REGION_ALIAS("XTORS_FLASH_LMA", flash0);
+
+/* Flash region to be used for code text.*/
+REGION_ALIAS("TEXT_FLASH", flash0);
+REGION_ALIAS("TEXT_FLASH_LMA", flash0);
+
+/* Flash region to be used for read only data.*/
+REGION_ALIAS("RODATA_FLASH", flash0);
+REGION_ALIAS("RODATA_FLASH_LMA", flash0);
+
+/* Flash region to be used for various.*/
+REGION_ALIAS("VARIOUS_FLASH", flash0);
+REGION_ALIAS("VARIOUS_FLASH_LMA", flash0);
+
+/* Flash region to be used for RAM(n) initialization data.*/
+REGION_ALIAS("RAM_INIT_FLASH_LMA", flash0);
+
+/* RAM region to be used for Main stack. This stack accommodates the processing
+   of all exceptions and interrupts.*/
+REGION_ALIAS("MAIN_STACK_RAM", ram0);
+
+/* RAM region to be used for the process stack. This is the stack used by
+   the main() function.*/
+REGION_ALIAS("PROCESS_STACK_RAM", ram0);
+
+/* RAM region to be used for data segment.*/
+REGION_ALIAS("DATA_RAM", ram0);
+REGION_ALIAS("DATA_RAM_LMA", flash0);
+
+/* RAM region to be used for BSS segment.*/
+REGION_ALIAS("BSS_RAM", ram0);
+
+/* RAM region to be used for the default heap.*/
+REGION_ALIAS("HEAP_RAM", ram0);
+
+/* Generic rules inclusion.*/
+INCLUDE rules.ld
diff --git a/quantum/mcu_selection.mk b/quantum/mcu_selection.mk
index f8def7f674..ca0accd719 100644
--- a/quantum/mcu_selection.mk
+++ b/quantum/mcu_selection.mk
@@ -433,6 +433,40 @@ ifneq (,$(filter $(MCU),STM32L433 STM32L443))
   UF2_FAMILY ?= STM32L4
 endif
 
+ifneq (,$(filter $(MCU),STM32L412 STM32L422))
+  # Cortex version
+  MCU = cortex-m4
+
+  # ARM version, CORTEX-M0/M1 are 6, CORTEX-M3/M4/M7 are 7
+  ARMV = 7
+
+  ## chip/board settings
+  # - the next two should match the directories in
+  #   <chibios>/os/hal/ports/$(MCU_FAMILY)/$(MCU_SERIES)
+  MCU_FAMILY = STM32
+  MCU_SERIES = STM32L4xx
+
+  # Linker script to use
+  # - it should exist either in <chibios>/os/common/ports/ARMCMx/compilers/GCC/ld/
+  #   or <keyboard_dir>/ld/
+  MCU_LDSCRIPT ?= STM32L412xB
+
+  # Startup code to use
+  #  - it should exist in <chibios>/os/common/startup/ARMCMx/compilers/GCC/mk/
+  MCU_STARTUP ?= stm32l4xx
+
+  # Board: it should exist either in <chibios>/os/hal/boards/,
+  # <keyboard_dir>/boards/, or drivers/boards/
+  BOARD ?= GENERIC_STM32_L412XB
+
+  PLATFORM_NAME ?= platform_l432
+
+  USE_FPU ?= yes
+
+  # UF2 settings
+  UF2_FAMILY ?= STM32L4
+endif
+
 ifneq (,$(filter $(MCU),at90usb162 atmega16u2 atmega32u2 atmega16u4 atmega32u4 at90usb646 at90usb647 at90usb1286 at90usb1287))
   PROTOCOL = LUFA