[PATCH 2/7] reset: stm32mp21: add stm32mp21 reset driver
Patrice Chotard
patrice.chotard at foss.st.com
Tue Feb 3 17:49:22 CET 2026
Implement STM32MP21 reset drivers using stm32-core-reset API.
Signed-off-by: Gabriel Fernandez <gabriel.fernandez at foss.st.com>
Signed-off-by: Patrice Chotard <patrice.chotard at foss.st.com>
---
drivers/reset/stm32/Kconfig | 7 ++
drivers/reset/stm32/Makefile | 1 +
drivers/reset/stm32/stm32-reset-mp21.c | 136 +++++++++++++++++++++++++++++++++
3 files changed, 144 insertions(+)
diff --git a/drivers/reset/stm32/Kconfig b/drivers/reset/stm32/Kconfig
index fdd88a6bfae..1bafba516af 100644
--- a/drivers/reset/stm32/Kconfig
+++ b/drivers/reset/stm32/Kconfig
@@ -14,6 +14,13 @@ config RESET_STM32MP1
Support for reset controllers on STMicroelectronics STM32MP1 family SoCs.
This reset driver is compatible with STM32MP13 and STM32MP15 SoCs.
+config RESET_STM32MP21
+ bool "Enable the STM32MP21 reset"
+ default y if STM32MP21X
+ help
+ Support for reset controllers on STMicroelectronics STM32MP21 family SoCs.
+ This reset driver is compatible with STM32MP21 SoCs.
+
config RESET_STM32MP25
bool "Enable the STM32MP25 reset"
depends on STM32MP23X || STM32MP25X
diff --git a/drivers/reset/stm32/Makefile b/drivers/reset/stm32/Makefile
index c31ae524ba1..ac4d3c6fc8f 100644
--- a/drivers/reset/stm32/Makefile
+++ b/drivers/reset/stm32/Makefile
@@ -6,4 +6,5 @@ obj-y += stm32-reset-core.o
obj-$(CONFIG_RESET_STM32) += stm32-reset.o
obj-$(CONFIG_RESET_STM32MP1) += stm32-reset-mp1.o
+obj-$(CONFIG_RESET_STM32MP21) += stm32-reset-mp21.o
obj-$(CONFIG_RESET_STM32MP25) += stm32-reset-mp25.o
diff --git a/drivers/reset/stm32/stm32-reset-mp21.c b/drivers/reset/stm32/stm32-reset-mp21.c
new file mode 100644
index 00000000000..7d169d7582f
--- /dev/null
+++ b/drivers/reset/stm32/stm32-reset-mp21.c
@@ -0,0 +1,136 @@
+// SPDX-License-Identifier: GPL-2.0-or-later OR BSD-3-Clause
+/*
+ * Copyright (C) 2026, STMicroelectronics - All Rights Reserved
+ * Author(s): Gabriel Fernandez, <gabriel.fernandez at foss.st.com> for STMicroelectronics.
+ */
+
+#include <dm.h>
+#include <stm32-reset-core.h>
+#include <stm32mp21_rcc.h>
+#include <dt-bindings/reset/st,stm32mp21-rcc.h>
+
+/* Reset clear offset for STM32MP RCC */
+#define RCC_CLR_OFFSET 0x4
+
+/* Timeout for deassert */
+#define STM32_DEASSERT_TIMEOUT_US 10000
+
+#define RESET(id, _offset, _bit_idx, _set_clr) \
+ [id] = &(struct stm32_reset_cfg){ \
+ .offset = (_offset), \
+ .bit_idx = (_bit_idx), \
+ .set_clr = (_set_clr), \
+ }
+
+static const struct stm32_reset_cfg *stm32mp21_reset[] = {
+ RESET(TIM1_R, RCC_TIM1CFGR, 0, 0),
+ RESET(TIM2_R, RCC_TIM2CFGR, 0, 0),
+ RESET(TIM3_R, RCC_TIM3CFGR, 0, 0),
+ RESET(TIM4_R, RCC_TIM4CFGR, 0, 0),
+ RESET(TIM5_R, RCC_TIM5CFGR, 0, 0),
+ RESET(TIM6_R, RCC_TIM6CFGR, 0, 0),
+ RESET(TIM7_R, RCC_TIM7CFGR, 0, 0),
+ RESET(TIM8_R, RCC_TIM8CFGR, 0, 0),
+ RESET(TIM10_R, RCC_TIM10CFGR, 0, 0),
+ RESET(TIM11_R, RCC_TIM11CFGR, 0, 0),
+ RESET(TIM12_R, RCC_TIM12CFGR, 0, 0),
+ RESET(TIM13_R, RCC_TIM13CFGR, 0, 0),
+ RESET(TIM14_R, RCC_TIM14CFGR, 0, 0),
+ RESET(TIM15_R, RCC_TIM15CFGR, 0, 0),
+ RESET(TIM16_R, RCC_TIM16CFGR, 0, 0),
+ RESET(TIM17_R, RCC_TIM17CFGR, 0, 0),
+ RESET(LPTIM1_R, RCC_LPTIM1CFGR, 0, 0),
+ RESET(LPTIM2_R, RCC_LPTIM2CFGR, 0, 0),
+ RESET(LPTIM3_R, RCC_LPTIM3CFGR, 0, 0),
+ RESET(LPTIM4_R, RCC_LPTIM4CFGR, 0, 0),
+ RESET(LPTIM5_R, RCC_LPTIM5CFGR, 0, 0),
+ RESET(SPI1_R, RCC_SPI1CFGR, 0, 0),
+ RESET(SPI2_R, RCC_SPI2CFGR, 0, 0),
+ RESET(SPI3_R, RCC_SPI3CFGR, 0, 0),
+ RESET(SPI4_R, RCC_SPI4CFGR, 0, 0),
+ RESET(SPI5_R, RCC_SPI5CFGR, 0, 0),
+ RESET(SPI6_R, RCC_SPI6CFGR, 0, 0),
+ RESET(SPDIFRX_R, RCC_SPDIFRXCFGR, 0, 0),
+ RESET(USART1_R, RCC_USART1CFGR, 0, 0),
+ RESET(USART2_R, RCC_USART2CFGR, 0, 0),
+ RESET(USART3_R, RCC_USART3CFGR, 0, 0),
+ RESET(UART4_R, RCC_UART4CFGR, 0, 0),
+ RESET(UART5_R, RCC_UART5CFGR, 0, 0),
+ RESET(USART6_R, RCC_USART6CFGR, 0, 0),
+ RESET(UART7_R, RCC_UART7CFGR, 0, 0),
+ RESET(LPUART1_R, RCC_LPUART1CFGR, 0, 0),
+ RESET(I2C1_R, RCC_I2C1CFGR, 0, 0),
+ RESET(I2C2_R, RCC_I2C2CFGR, 0, 0),
+ RESET(I2C3_R, RCC_I2C3CFGR, 0, 0),
+ RESET(SAI1_R, RCC_SAI1CFGR, 0, 0),
+ RESET(SAI2_R, RCC_SAI2CFGR, 0, 0),
+ RESET(SAI3_R, RCC_SAI3CFGR, 0, 0),
+ RESET(SAI4_R, RCC_SAI4CFGR, 0, 0),
+ RESET(MDF1_R, RCC_MDF1CFGR, 0, 0),
+ RESET(FDCAN_R, RCC_FDCANCFGR, 0, 0),
+ RESET(HDP_R, RCC_HDPCFGR, 0, 0),
+ RESET(ADC1_R, RCC_ADC1CFGR, 0, 0),
+ RESET(ADC2_R, RCC_ADC2CFGR, 0, 0),
+ RESET(ETH1_R, RCC_ETH1CFGR, 0, 0),
+ RESET(ETH2_R, RCC_ETH2CFGR, 0, 0),
+ RESET(USBH_R, RCC_USBHCFGR, 0, 0),
+ RESET(USB2PHY1_R, RCC_USB2PHY1CFGR, 0, 0),
+ RESET(USB2PHY2_R, RCC_USB2PHY2CFGR, 0, 0),
+ RESET(SDMMC1_R, RCC_SDMMC1CFGR, 0, 0),
+ RESET(SDMMC1DLL_R, RCC_SDMMC1CFGR, 16, 0),
+ RESET(SDMMC2_R, RCC_SDMMC2CFGR, 0, 0),
+ RESET(SDMMC2DLL_R, RCC_SDMMC2CFGR, 16, 0),
+ RESET(SDMMC3_R, RCC_SDMMC3CFGR, 0, 0),
+ RESET(SDMMC3DLL_R, RCC_SDMMC3CFGR, 16, 0),
+ RESET(LTDC_R, RCC_LTDCCFGR, 0, 0),
+ RESET(CSI_R, RCC_CSICFGR, 0, 0),
+ RESET(DCMIPP_R, RCC_DCMIPPCFGR, 0, 0),
+ RESET(DCMIPSSI_R, RCC_DCMIPSSICFGR, 0, 0),
+ RESET(WWDG1_R, RCC_WWDG1CFGR, 0, 0),
+ RESET(VREF_R, RCC_VREFCFGR, 0, 0),
+ RESET(DTS_R, RCC_DTSCFGR, 0, 0),
+ RESET(CRC_R, RCC_CRCCFGR, 0, 0),
+ RESET(SERC_R, RCC_SERCCFGR, 0, 0),
+ RESET(I3C1_R, RCC_I3C1CFGR, 0, 0),
+ RESET(I3C2_R, RCC_I3C2CFGR, 0, 0),
+ RESET(IWDG2_KER_R, RCC_IWDGC1CFGSETR, 18, 1),
+ RESET(IWDG4_KER_R, RCC_IWDGC2CFGSETR, 18, 1),
+ RESET(RNG1_R, RCC_RNG1CFGR, 0, 0),
+ RESET(RNG2_R, RCC_RNG2CFGR, 0, 0),
+ RESET(PKA_R, RCC_PKACFGR, 0, 0),
+ RESET(SAES_R, RCC_SAESCFGR, 0, 0),
+ RESET(HASH1_R, RCC_HASH1CFGR, 0, 0),
+ RESET(HASH2_R, RCC_HASH2CFGR, 0, 0),
+ RESET(CRYP1_R, RCC_CRYP1CFGR, 0, 0),
+ RESET(CRYP2_R, RCC_CRYP2CFGR, 0, 0),
+ RESET(OTG_R, RCC_OTGCFGR, 0, 0),
+};
+
+static const struct stm32_reset_cfg *stm32_get_reset_line(struct reset_ctl *reset_ctl)
+{
+ unsigned long id = reset_ctl->id;
+
+ if (id < ARRAY_SIZE(stm32mp21_reset))
+ return stm32mp21_reset[id];
+
+ return NULL;
+}
+
+static const struct stm32_reset_data stm32mp21_reset_data = {
+ .get_reset_line = stm32_get_reset_line,
+ .clear_offset = RCC_CLR_OFFSET,
+ .reset_us = STM32_DEASSERT_TIMEOUT_US,
+};
+
+static int stm32_reset_probe(struct udevice *dev)
+{
+ return stm32_reset_core_probe(dev, &stm32mp21_reset_data);
+}
+
+U_BOOT_DRIVER(stm32mp21_rcc_reset) = {
+ .name = "stm32mp21_reset",
+ .id = UCLASS_RESET,
+ .probe = stm32_reset_probe,
+ .priv_auto = sizeof(struct stm32_reset_priv),
+ .ops = &stm32_reset_ops,
+};
--
2.43.0
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