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diff --git a/src/ipa/rkisp1/utils.cpp b/src/ipa/rkisp1/utils.cpp
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+++ b/src/ipa/rkisp1/utils.cpp
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+/* SPDX-License-Identifier: LGPL-2.1-or-later */
+/*
+ * Copyright (C) 2024, Paul Elder <paul.elder@ideasonboard.com>
+ *
+ * Miscellaneous utility functions specific to rkisp1
+ */
+
+#include "utils.h"
+
+/**
+ * \file utils.h
+ */
+
+namespace libcamera {
+
+namespace ipa::rkisp1::utils {
+
+/**
+ * \fn R floatingToFixedPoint(T number)
+ * \brief Convert a floating point number to a fixed-point representation
+ * \tparam I Bit width of the integer part of the fixed-point
+ * \tparam F Bit width of the fractional part of the fixed-point
+ * \tparam R Return type of the fixed-point representation
+ * \tparam T Input type of the floating point representation
+ * \param number The floating point number to convert to fixed point
+ * \return The converted value
+ */
+
+/**
+ * \fn R fixedToFloatingPoint(T number)
+ * \brief Convert a fixed-point number to a floating point representation
+ * \tparam I Bit width of the integer part of the fixed-point
+ * \tparam F Bit width of the fractional part of the fixed-point
+ * \tparam R Return type of the floating point representation
+ * \tparam T Input type of the fixed-point representation
+ * \param number The fixed point number to convert to floating point
+ * \return The converted value
+ */
+
+} /* namespace ipa::rkisp1::utils */
+
+} /* namespace libcamera */