This patch solves:

on x86_64:

when CONFIG_ACPI is not enabled:

../drivers/mfd/intel_soc_pmic_bxtwc.c: In function 'bxtwc_probe':
../drivers/mfd/intel_soc_pmic_bxtwc.c:342:2:
    error: implicit declaration of function 'acpi_evaluate_integer' 
[-Werror=implicit-function-declaration]
        status = acpi_evaluate_integer(handle, "_HRV", NULL, &hrv);
        ^

Reported-by: Randy Dunlap <[email protected]>
Signed-off-by: Lee Jones <[email protected]>
---
 drivers/platform/x86/Kconfig | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/platform/x86/Kconfig b/drivers/platform/x86/Kconfig
index c69bb70..744cb80 100644
--- a/drivers/platform/x86/Kconfig
+++ b/drivers/platform/x86/Kconfig
@@ -914,6 +914,7 @@ config PVPANIC
 
 config INTEL_PMC_IPC
        tristate "Intel PMC IPC Driver"
+       depends on ACPI
        ---help---
        This driver provides support for PMC control on some Intel platforms.
        The PMC is an ARC processor which defines IPC commands for communication
-- 
1.9.1

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