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authorHans de Goede <hdegoede@redhat.com>2017-06-04 14:31:28 +0300
committerLee Jones <lee.jones@linaro.org>2017-07-06 10:29:13 +0300
commitaaac4a2eadaa6474a347ee4b07d4ea8bb6908c8e (patch)
treecf56995e24b172976663fc5a82c897373ea42e15 /drivers/mfd
parentde85d79f4aab67fe0537dd6e2c5d545b88239cc4 (diff)
downloadlinux-aaac4a2eadaa6474a347ee4b07d4ea8bb6908c8e.tar.xz
mfd: axp20x-i2c: Document that this must be builtin on x86
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>
Diffstat (limited to 'drivers/mfd')
-rw-r--r--drivers/mfd/Kconfig5
1 files changed, 5 insertions, 0 deletions
diff --git a/drivers/mfd/Kconfig b/drivers/mfd/Kconfig
index 44e7164b5063..1428814c33f9 100644
--- a/drivers/mfd/Kconfig
+++ b/drivers/mfd/Kconfig
@@ -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