dev/serial: Move zynq_uart_input_clock()

This allows to wrap this function using the linker.

bsps/include/dev/serial/zynq-uart-regs.h

@@ -176,6 +176,11 @@ void zynq_uart_write_char_polled(volatile zynq_uart *regs, char c);
   */
 void zynq_uart_reset_tx_flush(volatile zynq_uart *regs);
 
+/**
+ * @brief Returns the Zynq UART input clock frequency in Hz.
+ */
+uint32_t zynq_uart_input_clock(void);
+
 /**
  * @brief Calculates the clock and baud divisor of the best approximation of
  *   the desired baud.

bsps/shared/dev/serial/zynq-uart-input-clock.c

@@ -0,0 +1,44 @@
+/* SPDX-License-Identifier: BSD-2-Clause */
+
+/**
+ * @file
+ *
+ * @ingroup RTEMSDeviceSerialZynq
+ *
+ * @brief This source file contains the implementation of the polled Zynq UART
+ *   support.
+ */
+
+/*
+ * Copyright (C) 2024 embedded brains GmbH & Co. KG
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
+ * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include <dev/serial/zynq-uart-regs.h>
+
+#include <bspopts.h>
+
+uint32_t zynq_uart_input_clock(void)
+{
+  return ZYNQ_CLOCK_UART;
+}

bsps/shared/dev/serial/zynq-uart-polled.c

@@ -41,16 +41,6 @@
 #include <rtems/dev/io.h>
 #include <rtems/score/assert.h>
 
-/*
- * Make weak and let the user override.
- */
-uint32_t zynq_uart_input_clock(void) __attribute__ ((weak));
-
-uint32_t zynq_uart_input_clock(void)
-{
-  return ZYNQ_CLOCK_UART;
-}
-
 static uint32_t zync_uart_baud_error(
   uint32_t selected_clock,
   uint32_t desired_baud,

spec/build/bsps/objdevserialzynq.yml

@@ -18,6 +18,7 @@ links:
 - role: build-dependency
   uid: optzynquartkernbase
 source:
+- bsps/shared/dev/serial/zynq-uart-input-clock.c
 - bsps/shared/dev/serial/zynq-uart-kernel-io.c
 - bsps/shared/dev/serial/zynq-uart-polled.c
 - bsps/shared/dev/serial/zynq-uart.c