boards/common/stm32: Clock for F7 216MHz/8MHz/LSE

Added file with clock settings for STM32-F7 CPUs with a core clock of 216MHz,
an external high speed clock of 8 MHz and external low speed clock (32.768kHz)
enabled.

boards/common/stm32/include/f7/cfg_clock_216_8_1.h

@@ -0,0 +1,59 @@
+/*
+ * Copyright (C) 2019 Otto-von-Guericke-Universität Magdeburg
+ *
+ * This file is subject to the terms and conditions of the GNU Lesser
+ * General Public License v2.1. See the file LICENSE in the top level
+ * directory for more details.
+ */
+
+/**
+ * @ingroup     boards_common_stm32
+ * @{
+ *
+ * @file
+ * @brief       Configure STM32F7 clock to 216MHz and 8MHz HSE using PLL with
+ *              LSE
+ *
+ * @author      Marian Buschsieweke <marian.buschsieweke@ovgu.de>
+ *
+ * @note        This is auto-generated from
+ *              `cpu/stm32_common/dist/clk_conf/clk_conf.c`
+ * @{
+ */
+
+#ifndef F7_CFG_CLOCK_216_8_1_H
+#define F7_CFG_CLOCK_216_8_1_H
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/* give the target core clock (HCLK) frequency [in Hz],
+ * maximum: 216MHz */
+#define CLOCK_CORECLOCK     (216000000U)
+/* 0: no external high speed crystal available
+ * else: actual crystal frequency [in Hz] */
+#define CLOCK_HSE           (8000000U)
+/* 0: no external low speed crystal available,
+ * 1: external crystal available (always 32.768kHz) */
+#define CLOCK_LSE           (1U)
+/* peripheral clock setup */
+#define CLOCK_AHB_DIV       RCC_CFGR_HPRE_DIV1
+#define CLOCK_AHB           (CLOCK_CORECLOCK / 1)
+#define CLOCK_APB1_DIV      RCC_CFGR_PPRE1_DIV4     /* max 54MHz */
+#define CLOCK_APB1          (CLOCK_CORECLOCK / 4)
+#define CLOCK_APB2_DIV      RCC_CFGR_PPRE2_DIV2     /* max 108MHz */
+#define CLOCK_APB2          (CLOCK_CORECLOCK / 2)
+
+/* Main PLL factors */
+#define CLOCK_PLL_M          (4)
+#define CLOCK_PLL_N          (216)
+#define CLOCK_PLL_P          (2)
+#define CLOCK_PLL_Q          (9)
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* F7_CFG_CLOCK_216_8_1_H */
+/** @} */