The patch below does not apply to the 5.12-stable tree. If someone wants it applied there, or to any other stable or longterm tree, then please email the backport, including the original git commit id to stable@vger.kernel.org.
thanks,
greg k-h
------------------ original commit in Linus's tree ------------------
From c03e2df6e1d51f4e1252318275007214a3bd8e85 Mon Sep 17 00:00:00 2001
From: Jonathan Cameron Jonathan.Cameron@huawei.com Date: Sun, 24 Jan 2021 19:10:22 +0000 Subject: [PATCH] iio:adc:stm32-adc: Add HAS_IOMEM dependency
Seems that there are config combinations in which this driver gets enabled and hence selects the MFD, but with out HAS_IOMEM getting pulled in via some other route. MFD is entirely contained in an if HAS_IOMEM block, leading to the build issue in this bugzilla.
https://bugzilla.kernel.org/show_bug.cgi?id=209889
Cc: Stable@vger.kernel.org Signed-off-by: Jonathan Cameron Jonathan.Cameron@huawei.com
diff --git a/drivers/iio/adc/Kconfig b/drivers/iio/adc/Kconfig index bf7d22fa4be2..6605c263949c 100644 --- a/drivers/iio/adc/Kconfig +++ b/drivers/iio/adc/Kconfig @@ -923,6 +923,7 @@ config STM32_ADC_CORE depends on ARCH_STM32 || COMPILE_TEST depends on OF depends on REGULATOR + depends on HAS_IOMEM select IIO_BUFFER select MFD_STM32_TIMERS select IIO_STM32_TIMER_TRIGGER