Since commit c89c0114955a ("mfd: syscon: Set regmap max_register in of_syscon_register") the syscon uses ioremap so it fails on COMPILE_TEST without HAS_IOMEM: drivers/mfd/syscon.c: In function ‘of_syscon_register’: drivers/mfd/syscon.c:67:9: error: implicit declaration of function ‘ioremap’ [-Werror=implicit-function-declaration] base = ioremap(res.start, resource_size(&res)); ^ drivers/mfd/syscon.c:67:7: warning: assignment makes pointer from integer without a cast [-Wint-conversion] base = ioremap(res.start, resource_size(&res)); ^ drivers/mfd/syscon.c:109:2: error: implicit declaration of function ‘iounmap’ [-Werror=implicit-function-declaration] iounmap(base); When selecting MFD_SYSCON, depend on HAS_IOMEM to avoid unmet direct dependencies. Reported-by: kbuild test robot <lkp@xxxxxxxxx> Fixes: c89c0114955a ("mfd: syscon: Set regmap max_register in of_syscon_register") Signed-off-by: Krzysztof Kozlowski <k.kozlowski@xxxxxxxxxxx> --- drivers/mfd/Kconfig | 1 + 1 file changed, 1 insertion(+) diff --git a/drivers/mfd/Kconfig b/drivers/mfd/Kconfig index aa21dc55eb15..2e5b1e525a1d 100644 --- a/drivers/mfd/Kconfig +++ b/drivers/mfd/Kconfig @@ -1034,6 +1034,7 @@ config MFD_SUN6I_PRCM config MFD_SYSCON bool "System Controller Register R/W Based on Regmap" + depends on HAS_IOMEM select REGMAP_MMIO help Select this option to enable accessing system control registers -- 2.5.0 -- To unsubscribe from this list: send the line "unsubscribe dmaengine" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html