mfd: stm32-timers: Fix pwm-stm32 linker issue with COMPILE_TEST

This is seen when COMPILE_TEST=y and MFD_STM32_TIMERS=n.
drivers/pwm/pwm-stm32.o: In function 'stm32_pwm_raw_capture':
pwm-stm32.c:... undefined reference to 'stm32_timers_dma_burst_read'
Fixes: 0c6609805b63 ("mfd: stm32-timers: Add support for DMAs")

Signed-off-by: Fabrice Gasnier <fabrice.gasnier@st.com>
Reported-by: Randy Dunlap <rdunlap@infradead.org>
Tested-by: Randy Dunlap <rdunlap@infradead.org>

Signed-off-by: Lee Jones <lee.jones@linaro.org>

1 files changed, 12 insertions, 0 deletions

diff --git a/include/linux/mfd/stm32-timers.h b/include/linux/mfd/stm32-timers.h
index 9da1d7ece079..067d14655c28 100644
--- a/include/linux/mfd/stm32-timers.h
+++ b/include/linux/mfd/stm32-timers.h
@@ -124,8 +124,20 @@ struct stm32_timers {
         struct stm32_timers_dma dma; /* Only to be used by the parent */
 };
 
+#if IS_REACHABLE(CONFIG_MFD_STM32_TIMERS)
 int stm32_timers_dma_burst_read(struct device *dev, u32 *buf,
                                 enum stm32_timers_dmas id, u32 reg,
                                 unsigned int num_reg, unsigned int bursts,
                                 unsigned long tmo_ms);
+#else
+static inline int stm32_timers_dma_burst_read(struct device *dev, u32 *buf,
+                                              enum stm32_timers_dmas id,
+                                              u32 reg,
+                                              unsigned int num_reg,
+                                              unsigned int bursts,
+                                              unsigned long tmo_ms)
+{
+        return -ENODEV;
+}
+#endif
 #endif