linux-kernel - Re: [PATCH 3/3] spi: attach/detach SPI device to the ACPI power domain

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Date:	Thu, 10 Oct 2013 09:12:56 +0300
From:	Mika Westerberg <mika.westerberg@...ux.intel.com>
To:	Mark Brown <broonie@...nel.org>
Cc:	linux-acpi@...r.kernel.org, Wolfram Sang <wsa@...-dreams.de>,
	"Rafael J. Wysocki" <rjw@...ysocki.net>,
	Aaron Lu <aaron.lu@...el.com>, Lv Zheng <lv.zheng@...el.com>,
	linux-i2c@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 3/3] spi: attach/detach SPI device to the ACPI power
 domain

On Wed, Oct 09, 2013 at 06:55:28PM +0100, Mark Brown wrote:
> On Wed, Oct 09, 2013 at 05:04:21PM +0300, Mika Westerberg wrote:
> > If the SPI device is enumerated from ACPI namespace (it has an ACPI handle)
> > it might have ACPI methods that needs to be called in order to transition
> > the device to different power states (such as _PSx).
> 
> Acked-by: Mark Brown <broonie@...aro.org>

Thanks!

> > +	if (ACPI_HANDLE(&spi->dev))
> > +		acpi_dev_pm_attach(&spi->dev, true);
> 
> Though I do wonder if it wouldn't be sensible to push the if () here
> inside acpi_dev_pm_attach() and similarly for _detach().  Terribly
> trivial either way.

Actually, the check is already there in acpi_dev_pm_attach()/detach(). The
above code follows what Rafael did for platform bus previously. I think the
idea is to have visual hint that this is only for ACPI enumerated devices.

If preferred, I can drop the if() checks, though.
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