include/dt-bindings: clocks: stm32h7: Use _C1_ registers offset

STM32H7 series offer alias addresses to access some registers that could
be accessed by the M4 core on dual core variants.
For instance RCC_AHB3ENR could be accessed at following offsets:
- 0x0D4: Accessible from both cores
- 0x134: Accessible from C1 (M7) core
- 0x194: Accessible from C2 (M4) core (if any)

For most single core H7 variants, the two first addresses were accessible,
but for some others (stm32h7ax/stm32h7bx), only the 'C1 accessible'
was available.

This fact used to be hidden by the use of LL API to access these registers,
providing the required abstraction (an mainly using the first alias
when possible to simplify implementation).

Signed-off-by: Erwan Gouriou <[email protected]>

Author: erwango

drivers/clock_control/clock_stm32_ll_h7.c

@@ -153,6 +153,14 @@
 #endif
 #endif /* CONFIG_CPU_CORTEX_M7 */
 
+#if defined(CONFIG_CPU_CORTEX_M7)
+/* Offset to access bus clock registers from M7 (or only) core */
+#define STM32H7_BUS_CLK_REG	DT_REG_ADDR(DT_NODELABEL(rcc))
+#elif defined(CONFIG_CPU_CORTEX_M4)
+/* Offset to access bus clock registers from M4 core */
+#define STM32H7_BUS_CLK_REG	DT_REG_ADDR(DT_NODELABEL(rcc)) + 0x60
+#endif
+
 static uint32_t get_bus_clock(uint32_t clock, uint32_t prescaler)
 {
 	return clock / prescaler;
@@ -329,7 +337,7 @@ static inline int stm32_clock_control_on(const struct device *dev,
 
 	z_stm32_hsem_lock(CFG_HW_RCC_SEMID, HSEM_LOCK_DEFAULT_RETRY);
 
-	reg = (uint32_t *)(DT_REG_ADDR(DT_NODELABEL(rcc)) + pclken->bus);
+	reg = (uint32_t *)(STM32H7_BUS_CLK_REG + pclken->bus);
 	reg_val = *reg;
 	reg_val |= pclken->enr;
 	*reg = reg_val;
@@ -355,7 +363,7 @@ static inline int stm32_clock_control_off(const struct device *dev,
 
 	z_stm32_hsem_lock(CFG_HW_RCC_SEMID, HSEM_LOCK_DEFAULT_RETRY);
 
-	reg = (uint32_t *)(DT_REG_ADDR(DT_NODELABEL(rcc)) + pclken->bus);
+	reg = (uint32_t *)(STM32H7_BUS_CLK_REG + pclken->bus);
 	reg_val = *reg;
 	reg_val &= ~pclken->enr;
 	*reg = reg_val;

include/dt-bindings/clock/stm32h7_clock.h

@@ -7,15 +7,15 @@
 #define ZEPHYR_INCLUDE_DT_BINDINGS_CLOCK_STM32H7_CLOCK_H_
 
 /* clock bus references */
-#define STM32_CLOCK_BUS_AHB3    0x0D4
-#define STM32_CLOCK_BUS_AHB1    0x0D8
-#define STM32_CLOCK_BUS_AHB2    0x0DC
-#define STM32_CLOCK_BUS_AHB4    0x0E0
-#define STM32_CLOCK_BUS_APB3    0x0E4
-#define STM32_CLOCK_BUS_APB1    0x0E8
-#define STM32_CLOCK_BUS_APB1_2  0x0EC
-#define STM32_CLOCK_BUS_APB2    0x0F0
-#define STM32_CLOCK_BUS_APB4    0x0F4
+#define STM32_CLOCK_BUS_AHB3    0x134
+#define STM32_CLOCK_BUS_AHB1    0x138
+#define STM32_CLOCK_BUS_AHB2    0x13c
+#define STM32_CLOCK_BUS_AHB4    0x140
+#define STM32_CLOCK_BUS_APB3    0x144
+#define STM32_CLOCK_BUS_APB1    0x148
+#define STM32_CLOCK_BUS_APB1_2  0x14c
+#define STM32_CLOCK_BUS_APB2    0x150
+#define STM32_CLOCK_BUS_APB4    0x154
 
 #define STM32_PERIPH_BUS_MIN	STM32_CLOCK_BUS_AHB3
 #define STM32_PERIPH_BUS_MAX	STM32_CLOCK_BUS_APB4