drivers: clock_control: add mp2 clock driver

Add the stm32mp2 clock driver to the clock_control subsystem. The driver
is a reduced version of the generic stm32 clock driver.

Signed-off-by: Youssef Zini <youssef.zini@savoirfairelinux.com>

Author: youssefz24

drivers/clock_control/CMakeLists.txt

@@ -67,6 +67,8 @@ if(CONFIG_SOC_SERIES_STM32MP1X)
   zephyr_library_sources(clock_stm32_ll_mp1.c)
 elseif(CONFIG_SOC_SERIES_STM32MP13X)
   zephyr_library_sources(clock_stm32_ll_mp13.c)
+elseif(CONFIG_SOC_SERIES_STM32MP2X)
+  zephyr_library_sources(clock_stm32_ll_mp2.c)
 elseif(CONFIG_SOC_SERIES_STM32H7X)
   zephyr_library_sources(clock_stm32_ll_h7.c)
 elseif(CONFIG_SOC_SERIES_STM32H7RSX)

drivers/clock_control/clock_stm32_ll_mp2.c

@@ -0,0 +1,72 @@
+/*
+ * Copyright (C) 2025 Savoir-faire Linux, Inc.
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+#include <soc.h>
+#include <stm32_ll_bus.h>
+#include <stm32_ll_rcc.h>
+#include <zephyr/arch/cpu.h>
+#include <zephyr/drivers/clock_control/stm32_clock_control.h>
+#include <zephyr/sys/util.h>
+
+static int stm32_clock_control_on(const struct device *dev, clock_control_subsys_t sub_system)
+{
+	struct stm32_pclken *pclken = (struct stm32_pclken *) sub_system;
+
+	ARG_UNUSED(dev);
+
+	if (!IN_RANGE(pclken->bus, STM32_CLOCK_PERIPH_MIN, STM32_CLOCK_PERIPH_MAX)) {
+		/* Attempt to change a wrong periph clock bit */
+		return -ENOTSUP;
+	}
+
+	sys_set_bits(DT_REG_ADDR(DT_NODELABEL(rcc)) + pclken->bus, pclken->enr);
+
+	return 0;
+}
+
+static int stm32_clock_control_off(const struct device *dev, clock_control_subsys_t sub_system)
+{
+	struct stm32_pclken *pclken = (struct stm32_pclken *) sub_system;
+
+	ARG_UNUSED(dev);
+
+	if (!IN_RANGE(pclken->bus, STM32_CLOCK_PERIPH_MIN, STM32_CLOCK_PERIPH_MAX)) {
+		/* Attempt to toggle a wrong periph clock bit */
+		return -ENOTSUP;
+	}
+
+	sys_clear_bits(DT_REG_ADDR(DT_NODELABEL(rcc)) + pclken->bus, pclken->enr);
+
+	return 0;
+}
+
+static int stm32_clock_control_get_subsys_rate(const struct device *dev,
+					       clock_control_subsys_t sub_system, uint32_t *rate)
+{
+	ARG_UNUSED(dev);
+	ARG_UNUSED(sub_system);
+	ARG_UNUSED(rate);
+	return -ENOTSUP;
+}
+
+static DEVICE_API(clock_control, stm32_clock_control_api) = {
+	.on = stm32_clock_control_on,
+	.off = stm32_clock_control_off,
+	.get_rate = stm32_clock_control_get_subsys_rate,
+};
+
+static int stm32_clock_control_init(const struct device *dev)
+{
+	ARG_UNUSED(dev);
+	return 0;
+}
+
+/**
+ * @brief RCC device, note that priority is intentionally set to 1 so
+ * that the device init runs just after SOC init
+ */
+DEVICE_DT_DEFINE(DT_NODELABEL(rcc), stm32_clock_control_init, NULL, NULL, NULL, PRE_KERNEL_1,
+		 CONFIG_CLOCK_CONTROL_INIT_PRIORITY, &stm32_clock_control_api);

include/zephyr/drivers/clock_control/stm32_clock_control.h

@@ -41,6 +41,8 @@
 #elif defined(CONFIG_SOC_SERIES_STM32L4X) || \
 	defined(CONFIG_SOC_SERIES_STM32L5X)
 #include <zephyr/dt-bindings/clock/stm32l4_clock.h>
+#elif defined(CONFIG_SOC_SERIES_STM32MP2X)
+#include <zephyr/dt-bindings/clock/stm32mp2_clock.h>
 #elif defined(CONFIG_SOC_SERIES_STM32WBX)
 #include <zephyr/dt-bindings/clock/stm32wb_clock.h>
 #elif defined(CONFIG_SOC_SERIES_STM32WB0X)