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Date:	Tue, 16 Sep 2014 14:54:40 -0700
From:	Lee Jones <>
To:	Mika Westerberg <>
Cc:	"Rafael J. Wysocki" <>,,,,
	Greg Kroah-Hartman <>,
	Linus Walleij <>,
	Alexandre Courbot <>,
	Dmitry Torokhov <>,
	Bryan Wu <>,
	Grant Likely <>,
	Arnd Bergmann <>, Aaron Lu <>,
	Darren Hart <>
Subject: Re: [RFC PATCH v2 05/16] mfd: Add ACPI support

On Tue, 16 Sep 2014, Mika Westerberg wrote:

> If an MFD device is backed by ACPI namespace, we should allow subdevice
> drivers to access their corresponding ACPI companion devices through normal
> means (e.g using ACPI_COMPANION()).
> This patch adds such support to the MFD core. If the MFD parent device
> does not specify any ACPI _HID/_CID for the child device, the child
> device will share the parent ACPI companion device. Otherwise the child
> device will be assigned with the corresponding ACPI companion, if found
> in the namespace below the parent.
> Signed-off-by: Mika Westerberg <>
> Reviewed-by: Darren Hart <>
> ---
> Lee, I tried to get rid of #ifdefs in the below patch but it wasn't
> possible because we are using functions that are not available when
>  Documentation/acpi/enumeration.txt | 27 +++++++++++++++++++++++++
>  drivers/mfd/mfd-core.c             | 40 ++++++++++++++++++++++++++++++++++++++
>  include/linux/mfd/core.h           |  3 +++
>  3 files changed, 70 insertions(+)

Acked-by: Lee Jones <>

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