ACPI / property: Document usage rules for _DSD properties
Following some discussions during the Kernel Summit and LPC, document what can be returned from ACPI _DSD as device properties and when it is valid to use the special PRP0001 device ID. Signed-off-by: NRafael J. Wysocki <rafael.j.wysocki@intel.com> Reviewed-by: NMika Westerberg <mika.westerberg@linux.intel.com> Acked-by: NAndy Shevchenko <andriy.shevchenko@linux.intel.com> Reviwed-by: NMark Brown <broonie@kernel.org>
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