linux-kernel - Re: [PATCH v3 1/1] i2c: add ACPI support for I2C mux ports

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Date:	Thu, 22 Oct 2015 00:39:52 +0200
From:	"Rafael J. Wysocki" <rafael@...nel.org>
To:	Dustin Byford <dustin@...ulusnetworks.com>
Cc:	Mika Westerberg <mika.westerberg@...ux.intel.com>,
	Wolfram Sang <wsa@...-dreams.de>, linux-i2c@...r.kernel.org,
	ACPI Devel Maling List <linux-acpi@...r.kernel.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	"Rafael J. Wysocki" <rjw@...ysocki.net>,
	Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
Subject: Re: [PATCH v3 1/1] i2c: add ACPI support for I2C mux ports

Hi,

On Wed, Oct 21, 2015 at 11:25 AM, Dustin Byford
<dustin@...ulusnetworks.com> wrote:
> On Wed Oct 21 12:08, Mika Westerberg wrote:
>> I don't really have strong feelings whether it should be the I2C core or
>> individual drivers setting the ACPI companion. However, it would be nice
>> to match DT here and they assign their of_node per driver.
>
> OK with me, if we can convince Rafael this is a good idea, I'll send a
> new revision with drivers setting the companion.

If you can guarantee that ACPI PM or anything like _DS or _SRS will
never be invoked for the device objects that "inherit" the ACPI
companion from their parent, it at least is not outright dangerous.

That said I'm thinking that may need some more sophisticated approach
here, so we really can guarantee certain things, but that's for the
future.

Thanks,
Rafael
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