diff --git a/data/schemas/keyboard.jsonschema b/data/schemas/keyboard.jsonschema
index d3a26923b541..c2c467c40eba 100644
--- a/data/schemas/keyboard.jsonschema
+++ b/data/schemas/keyboard.jsonschema
@@ -98,6 +98,7 @@
                 "GD32VF103",
                 "WB32F3G71",
                 "WB32FQ95",
+                "CH579M",
                 "AT32F415",
                 "atmega16u2",
                 "atmega32u2",
@@ -265,7 +266,8 @@
                 "uf2boot",
                 "unknown",
                 "usbasploader",
-                "wb32-dfu"
+                "wb32-dfu",
+                "ch-isp"
             ]
         },
         "bootloader_instructions": {
diff --git a/lib/python/qmk/constants.py b/lib/python/qmk/constants.py
index e3e47c2bd280..5ec9109784f9 100644
--- a/lib/python/qmk/constants.py
+++ b/lib/python/qmk/constants.py
@@ -22,7 +22,7 @@
 MAX_KEYBOARD_SUBFOLDERS = 5
 
 # Supported processor types
-CHIBIOS_PROCESSORS = 'cortex-m0', 'cortex-m0plus', 'cortex-m3', 'cortex-m4', 'MKL26Z64', 'MK20DX128', 'MK20DX256', 'MK64FX512', 'MK66FX1M0', 'RP2040', 'STM32F042', 'STM32F072', 'STM32F103', 'STM32F303', 'STM32F401', 'STM32F405', 'STM32F407', 'STM32F411', 'STM32F446', 'STM32G0B1', 'STM32G431', 'STM32G474', 'STM32H723', 'STM32H733', 'STM32L412', 'STM32L422', 'STM32L432', 'STM32L433', 'STM32L442', 'STM32L443', 'GD32VF103', 'WB32F3G71', 'WB32FQ95', 'AT32F415'
+CHIBIOS_PROCESSORS = 'cortex-m0', 'cortex-m0plus', 'cortex-m3', 'cortex-m4', 'MKL26Z64', 'MK20DX128', 'MK20DX256', 'MK64FX512', 'MK66FX1M0', 'RP2040', 'STM32F042', 'STM32F072', 'STM32F103', 'STM32F303', 'STM32F401', 'STM32F405', 'STM32F407', 'STM32F411', 'STM32F446', 'STM32G0B1', 'STM32G431', 'STM32G474', 'STM32H723', 'STM32H733', 'STM32L412', 'STM32L422', 'STM32L432', 'STM32L433', 'STM32L442', 'STM32L443', 'GD32VF103', 'WB32F3G71', 'WB32FQ95', 'AT32F415', 'CH579M'
 LUFA_PROCESSORS = 'at90usb162', 'atmega16u2', 'atmega32u2', 'atmega16u4', 'atmega32u4', 'at90usb646', 'at90usb647', 'at90usb1286', 'at90usb1287', None
 VUSB_PROCESSORS = 'atmega32a', 'atmega328p', 'atmega328', 'attiny85'
 
@@ -57,6 +57,7 @@
     "WB32F3G71": "wb32-dfu",
     "WB32FQ95": "wb32-dfu",
     "AT32F415": "at32-dfu",
+    "CH579M": "ch-isp",
     "atmega16u2": "atmel-dfu",
     "atmega32u2": "atmel-dfu",
     "atmega16u4": "atmel-dfu",
diff --git a/platforms/chibios/boards/WCH_CH579_KEY12/board/board.c b/platforms/chibios/boards/WCH_CH579_KEY12/board/board.c
new file mode 100644
index 000000000000..cb5eba749f46
--- /dev/null
+++ b/platforms/chibios/boards/WCH_CH579_KEY12/board/board.c
@@ -0,0 +1,20 @@
+// Copyright 2026 Ryan McLean
+// SPDX-License-Identifier: GPL-2.0-or-later
+
+#include "hal.h"
+
+void __early_init(void) {
+    /* Nothing needed here — usb_lld_start() handles D+ pull-up at 48 MHz. */
+}
+
+/**
+ * @brief   Board-specific initialisation.
+ */
+void boardInit(void) {}
+
+/**
+ * @brief   PAL setup.
+ */
+#if HAL_USE_PAL || defined(__DOXYGEN__)
+const PALConfig pal_default_config = {0};
+#endif
diff --git a/platforms/chibios/boards/WCH_CH579_KEY12/board/board.h b/platforms/chibios/boards/WCH_CH579_KEY12/board/board.h
new file mode 100644
index 000000000000..0523a92676cb
--- /dev/null
+++ b/platforms/chibios/boards/WCH_CH579_KEY12/board/board.h
@@ -0,0 +1,20 @@
+// Copyright 2026 Ryan McLean
+// SPDX-License-Identifier: GPL-2.0-or-later
+
+#pragma once
+
+/*
+ * Board identifier — WCH CH579M macropad (KEY12-V02).
+ */
+
+#define CH579M
+
+#if !defined(_FROM_ASM_)
+#    ifdef __cplusplus
+extern "C" {
+#    endif
+void boardInit(void);
+#    ifdef __cplusplus
+}
+#    endif
+#endif /* _FROM_ASM_ */
diff --git a/platforms/chibios/boards/WCH_CH579_KEY12/board/board.mk b/platforms/chibios/boards/WCH_CH579_KEY12/board/board.mk
new file mode 100644
index 000000000000..842e33590594
--- /dev/null
+++ b/platforms/chibios/boards/WCH_CH579_KEY12/board/board.mk
@@ -0,0 +1,9 @@
+# List of all the board related files.
+BOARDSRC = $(BOARD_PATH)/board/board.c
+
+# Required include directories
+BOARDINC = $(BOARD_PATH)/board
+
+# Shared variables
+ALLCSRC += $(BOARDSRC)
+ALLINC  += $(BOARDINC)
diff --git a/platforms/chibios/boards/WCH_CH579_KEY12/configs/chconf.h b/platforms/chibios/boards/WCH_CH579_KEY12/configs/chconf.h
new file mode 100644
index 000000000000..f5295cbb44a6
--- /dev/null
+++ b/platforms/chibios/boards/WCH_CH579_KEY12/configs/chconf.h
@@ -0,0 +1,14 @@
+/* Copyright 2024 QMK
+ *
+ * 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.
+ */
+
+#pragma once
+
+/* CH579M uses ARM Cortex-M0 SysTick in periodic mode. */
+#define CH_CFG_ST_TIMEDELTA 0
+
+#include_next <chconf.h>
diff --git a/platforms/chibios/boards/WCH_CH579_KEY12/configs/halconf.h b/platforms/chibios/boards/WCH_CH579_KEY12/configs/halconf.h
new file mode 100644
index 000000000000..e76d5665d0c0
--- /dev/null
+++ b/platforms/chibios/boards/WCH_CH579_KEY12/configs/halconf.h
@@ -0,0 +1,43 @@
+/* Copyright 2024 QMK
+ *
+ * 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.
+ */
+
+#pragma once
+
+/*
+ * HAL driver enable switches for CH579M / KEY12-V02.
+ * Only PAL (GPIO), ST (SysTick tick), and USB are needed for a basic QMK HID keyboard.
+ */
+
+#define HAL_USE_PAL TRUE
+#define HAL_USE_ST TRUE
+#define HAL_USE_USB TRUE
+
+/* Everything else off */
+#define HAL_USE_ADC FALSE
+#define HAL_USE_CAN FALSE
+#define HAL_USE_DAC FALSE
+#define HAL_USE_EFL FALSE
+#define HAL_USE_GPT FALSE
+#define HAL_USE_I2C FALSE
+#define HAL_USE_ICU FALSE
+#define HAL_USE_MAC FALSE
+#define HAL_USE_MMC_SPI FALSE
+#define HAL_USE_PWM FALSE
+#define HAL_USE_RTC FALSE
+#define HAL_USE_SDC FALSE
+#define HAL_USE_SERIAL FALSE
+#define HAL_USE_SERIAL_USB FALSE
+#define HAL_USE_SIO FALSE
+#define HAL_USE_SPI FALSE
+#define HAL_USE_TRNG FALSE
+#define HAL_USE_UART FALSE
+#define HAL_USE_USB TRUE
+#define HAL_USE_WDG FALSE
+#define HAL_USE_WSPI FALSE
+
+#include_next <halconf.h>
diff --git a/platforms/chibios/boards/WCH_CH579_KEY12/configs/mcuconf.h b/platforms/chibios/boards/WCH_CH579_KEY12/configs/mcuconf.h
new file mode 100644
index 000000000000..2a9e62da2706
--- /dev/null
+++ b/platforms/chibios/boards/WCH_CH579_KEY12/configs/mcuconf.h
@@ -0,0 +1,31 @@
+/* Copyright 2024 QMK
+ *
+ * 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.
+ */
+
+#pragma once
+
+/*
+ * CH579M MCU configuration.
+ * Overrides defaults in the CH579 HAL driver headers.
+ */
+
+#define CH579M_MCUCONF TRUE
+
+/*
+ * Clock — HSI 32 MHz (CK32M) direct as HCLK; PLL on for USB 48 MHz.
+ * hal_lld_init() powers on the PLL (USB peripheral derives Fpll/10=48 MHz
+ * independently) and switches HCLK to CK32M direct mode (CLK_SYS_MOD=10).
+ * Datasheet Fsys spec: 32 MHz direct is within the valid range.
+ */
+#define CH579_HSECLK 0          /* No external crystal */
+#define CH579_SYSCLK 32000000UL /* CK32M direct (32 MHz HCLK) */
+
+/*
+ * IRQ priorities (0 = highest on CM0, 3 = lowest).
+ */
+#define CH579_ST_IRQ_PRIORITY 2
+#define CH579_USB_IRQ_PRIORITY 1
diff --git a/platforms/chibios/bootloader.mk b/platforms/chibios/bootloader.mk
index e292e1e0b08b..de712459a679 100644
--- a/platforms/chibios/bootloader.mk
+++ b/platforms/chibios/bootloader.mk
@@ -128,6 +128,12 @@ ifeq ($(strip $(BOOTLOADER)), at32-dfu)
     DFU_ARGS ?= -d 2E3C:DF11 -a 0 -s 0x08000000:leave
     DFU_SUFFIX_ARGS ?= -v 2E3C -p DF11
 endif
+ifeq ($(strip $(BOOTLOADER)), ch-isp)
+    # WCH CH579M ISP bootloader (wchisp / ch579flash)
+    OPT_DEFS   += -DBOOTLOADER_CH_ISP
+    BOOTLOADER_TYPE = ch_isp
+    FIRMWARE_FORMAT = bin
+endif
 
 ifeq ($(strip $(BOOTLOADER_TYPE)),)
     ifneq ($(strip $(BOOTLOADER)),)
diff --git a/platforms/chibios/bootloaders/ch_isp.c b/platforms/chibios/bootloaders/ch_isp.c
new file mode 100644
index 000000000000..f6e98396dc34
--- /dev/null
+++ b/platforms/chibios/bootloaders/ch_isp.c
@@ -0,0 +1,16 @@
+// Copyright 2026 Ryan McLean
+// SPDX-License-Identifier: GPL-2.0-or-later
+
+#include "bootloader.h"
+#include <ch.h>
+#include <hal.h>
+
+__attribute__((weak)) void bootloader_jump(void) {
+    /* CH579M ISP mode is usually entered by resetting with a specific pin low,
+     * or by executing a specific ROM function. For now, a system reset is used. */
+    NVIC_SystemReset();
+}
+
+__attribute__((weak)) void mcu_reset(void) {
+    NVIC_SystemReset();
+}
diff --git a/platforms/chibios/chibios_config.h b/platforms/chibios/chibios_config.h
index 41546e3e507c..bef81f9acc04 100644
--- a/platforms/chibios/chibios_config.h
+++ b/platforms/chibios/chibios_config.h
@@ -188,6 +188,11 @@
 #    define PAL_OUTPUT_SPEED_HIGHEST 0
 #endif
 
+/* WCH CH579 compatibility */
+#if defined(CH579_SYSCLK)
+#    define CPU_CLOCK CH579_SYSCLK
+#endif
+
 #if !defined(REALTIME_COUNTER_CLOCK)
 #    define REALTIME_COUNTER_CLOCK CPU_CLOCK
 #endif
diff --git a/platforms/chibios/flash.mk b/platforms/chibios/flash.mk
index 073475483493..ec28c1617d90 100644
--- a/platforms/chibios/flash.mk
+++ b/platforms/chibios/flash.mk
@@ -23,6 +23,21 @@ define EXEC_DFU_UTIL
 	$(DFU_UTIL) $(DFU_ARGS) -D $(BUILD_DIR)/$(TARGET).bin
 endef
 
+WCHISP ?= wchisp
+
+define EXEC_WCHISP
+	if ! lsusb -d 4348:55e0 > /dev/null 2>&1; then \
+		printf "$(MSG_BOOTLOADER_NOT_FOUND_QUICK_RETRY)" ;\
+		printf "Reset the board into ISP mode (hold BOOT low while plugging in).\n" ;\
+		while ! lsusb -d 4348:55e0 > /dev/null 2>&1; do \
+			printf "." ;\
+			sleep $(BOOTLOADER_RETRY_TIME) ;\
+		done ;\
+		printf "\n" ;\
+	fi
+	$(WCHISP) flash $(BUILD_DIR)/$(TARGET).bin
+endef
+
 WB32_DFU_UPDATER ?= wb32-dfu-updater_cli
 
 define EXEC_WB32_DFU_UPDATER
@@ -117,6 +132,8 @@ else ifeq ($(strip $(MCU_FAMILY)),AT32)
 	$(UNSYNC_OUTPUT_CMD) && $(call EXEC_DFU_UTIL)
 else ifeq ($(strip $(MCU_FAMILY)),GD32V)
 	$(UNSYNC_OUTPUT_CMD) && $(call EXEC_DFU_UTIL)
+else ifeq ($(strip $(MCU_FAMILY)),WCH)
+	$(UNSYNC_OUTPUT_CMD) && $(call EXEC_WCHISP)
 else
 	$(PRINT_OK); $(SILENT) || printf "$(MSG_FLASH_BOOTLOADER)"
 endif
diff --git a/platforms/chibios/mcu_selection.mk b/platforms/chibios/mcu_selection.mk
index 199bdb232118..cf618725d205 100644
--- a/platforms/chibios/mcu_selection.mk
+++ b/platforms/chibios/mcu_selection.mk
@@ -911,3 +911,18 @@ ifneq ($(findstring GD32VF103, $(MCU)),)
 
   USE_FPU ?= no
 endif
+
+ifneq ($(findstring CH579M, $(MCU)),)
+  MCU = cortex-m0
+  ARMV = 6
+  MCU_FAMILY = WCH
+  MCU_SERIES = CH579
+  MCU_LDSCRIPT ?= CH579M
+  MCU_STARTUP ?= ch579m
+  BOARD ?= WCH_CH579_KEY12
+  USE_FPU ?= no
+  USE_CHIBIOS_CONTRIB = yes
+  USE_PROCESS_STACKSIZE    ?= 0x800
+  USE_EXCEPTIONS_STACKSIZE ?= 0x400
+  FIRMWARE_FORMAT ?= bin
+endif