linux-kernel - Re: [PATCH 2/3] spi / ACPI: add ACPI enumeration support

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Message-ID: <20121105180847.GK24532@intel.com>
Date:	Mon, 5 Nov 2012 20:08:47 +0200
From:	Mika Westerberg <mika.westerberg@...ux.intel.com>
To:	Bjorn Helgaas <bhelgaas@...gle.com>
Cc:	Jean Delvare <khali@...ux-fr.org>,
	"Rafael J. Wysocki" <rjw@...k.pl>,
	Linus Walleij <linus.walleij@...aro.org>,
	Mark Brown <broonie@...nsource.wolfsonmicro.com>,
	linux-kernel@...r.kernel.org, lenb@...nel.org,
	rafael.j.wysocki@...el.com, grant.likely@...retlab.ca,
	ben-linux@...ff.org, w.sang@...gutronix.de,
	mathias.nyman@...ux.intel.com, linux-acpi@...r.kernel.org
Subject: Re: [PATCH 2/3] spi / ACPI: add ACPI enumeration support

On Mon, Nov 05, 2012 at 10:43:17AM -0700, Bjorn Helgaas wrote:
> > It should already be unique in case of ACPI. We use ACPI _HID and _UID to
> > achieve that.
> 
> Using only _HID and _UID to guarantee uniqueness means you're relying
> on a property of the BIOS, so you're vulnerable to BIOS bugs.
> 
> If there's an ACPI Device for I2C adapters, why wouldn't you just use
> its device name as set in acpi_device_register() (basically a _HID +
> instance number)?

That's a good point - we could change to use that instead (the platform
code in linux-pm tree uses _HID + _UID but I guess it is pretty trivial to
change).
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