dt-bindings: stm32mp2_reset.h: add reset bindings

Add reset bindings for UART/USART (1-9) peripherals for the STM32MP2
series.

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

Author: youssefz24

include/zephyr/dt-bindings/reset/stm32mp2_reset.h

@@ -0,0 +1,36 @@
+/*
+ * Copyright (C) 2025 Savoir-faire Linux, Inc.
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+#ifndef ZEPHYR_INCLUDE_DT_BINDINGS_RESET_STM32MP2_RESET_H_
+#define ZEPHYR_INCLUDE_DT_BINDINGS_RESET_STM32MP2_RESET_H_
+
+/**
+ * Pack RCC register offset and bit in one 32-bit value.
+ *
+ * 5 LSBs are used to keep bit number in 32-bit RCC register.
+ * Next 12 bits are used to keep RCC register offset.
+ * Remaining bits are unused.
+ *
+ * @param per STM32 peripheral name
+ * @param bit Reset bit
+ */
+#define STM32_RESET(per, bit) (((STM32_RESET_PERIPH_##per##) << 5U) | (bit))
+
+/* Reset reg */
+#define STM32_RST	0U
+
+/* USART/UART Peripheral */
+#define STM32_RESET_PERIPH_USART1	0x77C
+#define STM32_RESET_PERIPH_USART2	0x780
+#define STM32_RESET_PERIPH_USART3	0x784
+#define STM32_RESET_PERIPH_UART4	0x788
+#define STM32_RESET_PERIPH_UART5	0x78C
+#define STM32_RESET_PERIPH_USART6	0x790
+#define STM32_RESET_PERIPH_UART7	0x794
+#define STM32_RESET_PERIPH_UART8	0x798
+#define STM32_RESET_PERIPH_UART9	0x79C
+
+#endif /* ZEPHYR_INCLUDE_DT_BINDINGS_RESET_STM32MP2_RESET_H_ */