add new system file

hc

2024-02-20 102a0743326a03cd1a1202ceda21e175b7d3575c

 kernel/include/linux/iio/timer/stm32-timer-trigger.h
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@@ -1,9 +1,8 @@
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+/* SPDX-License-Identifier: GPL-2.0-only */
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 /*
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  * Copyright (C) STMicroelectronics 2016
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  *
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  * Author: Benjamin Gaignard <benjamin.gaignard@st.com>
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- *
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- * License terms:  GNU General Public License (GPL), version 2
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  */
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 #ifndef _STM32_TIMER_TRIGGER_H_
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@@ -73,6 +72,15 @@
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 #define TIM17_OC1	"tim17_oc1"
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+#if IS_REACHABLE(CONFIG_IIO_STM32_TIMER_TRIGGER)
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 bool is_stm32_timer_trigger(struct iio_trigger *trig);
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-
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+#else
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+static inline bool is_stm32_timer_trigger(struct iio_trigger *trig)
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+{
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+#if IS_ENABLED(CONFIG_IIO_STM32_TIMER_TRIGGER)
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+	pr_warn_once("stm32-timer-trigger not linked in\n");
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+#endif
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+	return false;
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+}
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+#endif
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 #endif