Date:   Tue, 30 May 2017 08:39:58 +0100
From:   Lee Jones <lee.jones@...aro.org>
To:     Hans de Goede <hdegoede@...hat.com>
Cc:     linux-kernel@...r.kernel.org, Chen-Yu Tsai <wens@...e.org>
Subject: Re: [PATCH v4 2/2] mfd: axp20x-i2c: Document that this must be
 builtin on x86

On Fri, 26 May 2017, Hans de Goede wrote:

> Hi,
> 
> On 22-05-17 12:56, Lee Jones wrote:
> > On Mon, 15 May 2017, Hans de Goede wrote:
> > 
> > > 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, OpRegionr 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 builtin 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@...hat.com>
> > 
> > Would be good to get an Ack by the users/maintainers of this driver.
> 
> If you look at recent commits to drivers for the mfd-subdevices for the AXP288
> (which is the only AXP PMIC found on x86 systems) you will see that I've
> been the only one touch them / caring about them and in many cases fixing
> them from being non-functional to actually working.
> 
> I do have quite a few people who are using the AXP288 code on Bay and Cherry
> Trail devices with this PMIC and who have send me thank you's and test
> success reports.

Would any of them be prepared to submit a Tested-by?

You can forward them (with permission) if you like.

> So I guess I'm the closest thing to a MAINTAINER for the axp288 bits of
> this driver.
> 
> > > ---
> > > Changes in v2:
> > > -Fix Kconfig depends and selects to fix warning reported by kbuild test robot
> > > -Improve commit msg (add example of ACPI errors this avoids)
> > > Changes in v3:
> > > -Since the axp20x mfd code is used on ARM too where it does not necessarily
> > >   need to be builtin settle for simply documenting the need to have this
> > >   builtin on x86
> > > ---
> > >   drivers/mfd/Kconfig | 5 +++++
> > >   1 file changed, 5 insertions(+)
> > > 
> > > diff --git a/drivers/mfd/Kconfig b/drivers/mfd/Kconfig
> > > index 61ebda81e134..cfac1e8a0a20 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
> > 
> > Nit: s/i2c/I2C/
> 
> Fixed for v5 (which I will send in a minute).
> 
> Regards,
> 
> Hans

-- 
Lee Jones
Linaro STMicroelectronics Landing Team Lead
Linaro.org │ Open source software for ARM SoCs
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