dm: reset: add stm32 reset driver

This driver is adapted from linux drivers/reset/reset-stm32.c
It's compatible with STM32 F4/F7/H7 SoCs.

This driver doesn't implement .of_match as it's binded
by MFD RCC driver.

To add support for each SoC family, a SoC's specific
include/dt-binfings/mfd/stm32xx-rcc.h file must be added.

This patch only includes stm32h7-rcc.h dedicated for STM32H7 SoCs.
Other SoCs support will be added in the future.

Signed-off-by: Patrice Chotard <patrice.chotard@st.com>
Reviewed-by: Simon Glass <sjg@chromium.org>
diff --git a/drivers/reset/Kconfig b/drivers/reset/Kconfig
index e6af7da..ce46e27 100644
--- a/drivers/reset/Kconfig
+++ b/drivers/reset/Kconfig
@@ -28,6 +28,13 @@
 	  Say Y if you want to control reset signals provided by system config
 	  block.
 
+config STM32_RESET
+	bool "Enable the STM32 reset"
+	depends on STM32
+	help
+	  Support for reset controllers on STMicroelectronics STM32 family SoCs.
+	  This resset driver is compatible with STM32 F4/F7 and H7 SoCs.
+
 config TEGRA_CAR_RESET
 	bool "Enable Tegra CAR-based reset driver"
 	depends on TEGRA_CAR