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mfd: axp20x-i2c: Document that this must be builtin on x86

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On x86 the AXP288 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.

Since the AXP20x MFD code is used on non x86 too we cannot simply change
this into a bool, I've tried some Kconfig magic with if x86 but I could
not get this working correctly, so this commit just documents that this
should be built-in on x86, which fixes errors like these during boot:

mmc0: SDHCI controller on ACPI [80860F14:00] using ADMA
ACPI Error: No handler for Region [REGS] (ffff93543b0cc3a8) [UserDefinedRegion]
ACPI Error: Region UserDefinedRegion (ID=143) has no handler (20170119/exfldio-2
ACPI Error: Method parse/execution failed [\_SB.PCI0.I2C7.PMI5.GET] (Node ffff93
ACPI Error: Method parse/execution failed [\_SB.PCI0.SHC1._PS0] (Node ffff93543b
acpi 80860F14:02: Failed to change power state to D0

Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Acked-by: Chen-Yu Tsai <wens@csie.org>
Tested-by: russianneuromancer <russianneuromancer@ya.ru>
Signed-off-by: Lee Jones <lee.jones@linaro.org>
This commit is contained in:
Hans de Goede 2017-06-04 13:31:28 +02:00 committed by Lee Jones
parent de85d79f4a
commit aaac4a2ead
1 changed files with 5 additions and 0 deletions
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5
drivers/mfd/Kconfig
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@ -160,6 +160,11 @@ config MFD_AXP20X_I2C
components like regulators or the PEK (Power Enable Key) under the
corresponding menus.
Note on x86 this provides an ACPI OpRegion, so this must be 'y'
(builtin) and not a module, as the OpRegion must be available as
soon as possible. For the same reason the I2C bus driver options
I2C_DESIGNWARE_PLATFORM and I2C_DESIGNWARE_BAYTRAIL must be 'y' too.
config MFD_AXP20X_RSB
tristate "X-Powers AXP series PMICs with RSB"
select MFD_AXP20X