[PATCH 4/5] mfd: intel_soc_pmic_chtwc: This driver must always be builtin when enabled

[Hans de Goede <hdegoede@redhat.com>]

The chtwc PMIC provides an ACPI OPRegion handler, which must be available
before other drivers using it are loaded, which can only be ensured if
the mfd, opregion and i2c-bus drivers are built in.

This commit changes the option for the mfd driver to bool and adds
a select for the i2c-bus driver, ensuring both are built-in if enabled.

This fixes errors like these during boot:

mmc0: SDHCI controller on ACPI [80860F14:00] using ADMA
ACPI Error: No handler for Region [REGS] (ffff93543b0cc3a8) [UserDefinedRegion] (20170119/evregion-166)
ACPI Error: Region UserDefinedRegion (ID=143) has no handler (20170119/exfldio-299)
ACPI Error: Method parse/execution failed [\_SB.PCI0.I2C7.PMI5.GET] (Node ffff93543b0cde10), AE_NOT_EXIST (20170119/psparse-543)
ACPI Error: Method parse/execution failed [\_SB.PCI0.SHC1._PS0] (Node ffff93543b0b5cd0), AE_NOT_EXIST (20170119/psparse-543)
acpi 80860F14:02: Failed to change power state to D0

Signed-off-by: Hans de Goede <hdegoede@redhat.com>
---
 drivers/mfd/Kconfig | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/drivers/mfd/Kconfig b/drivers/mfd/Kconfig
index 08f8dcb..396245d 100644
--- a/drivers/mfd/Kconfig
+++ b/drivers/mfd/Kconfig
@@ -443,12 +443,15 @@ config INTEL_SOC_PMIC
 	  on these systems.
 
 config INTEL_SOC_PMIC_CHTWC
-	tristate "Support for Intel Cherry Trail Whiskey Cove PMIC"
+	# This is a bool as it provides an ACPI Opregion which must be
+	# available as soon as possible
+	bool "Support for Intel Cherry Trail Whiskey Cove PMIC"
 	depends on ACPI
 	depends on I2C
 	select MFD_CORE
 	select REGMAP_I2C
 	select REGMAP_IRQ
+	select I2C_DESIGNWARE_PLATFORM
 	help
 	  Select this option to enable support for the Intel Cherry Trail
 	  Whiskey Cove PMIC found on some Intel Cherry Trail systems.
-- 
2.9.3