linux-kernel - Re: [RFC PATCH v2 05/16] mfd: Add ACPI support

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Date:	Tue, 16 Sep 2014 14:54:40 -0700
From:	Lee Jones <lee.jones@...aro.org>
To:	Mika Westerberg <mika.westerberg@...ux.intel.com>
Cc:	"Rafael J. Wysocki" <rjw@...ysocki.net>,
	linux-acpi@...r.kernel.org, devicetree@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Linus Walleij <linus.walleij@...aro.org>,
	Alexandre Courbot <gnurou@...il.com>,
	Dmitry Torokhov <dmitry.torokhov@...il.com>,
	Bryan Wu <cooloney@...il.com>,
	Grant Likely <grant.likely@...aro.org>,
	Arnd Bergmann <arnd@...db.de>, Aaron Lu <aaron.lu@...el.com>,
	Darren Hart <dvhart@...ux.intel.com>
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 <mika.westerberg@...ux.intel.com>
> Reviewed-by: Darren Hart <dvhart@...ux.intel.com>
> ---
> 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
> !CONFIG_ACPI.
> 
>  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@...aro.org>

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