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authorMika Westerberg <mika.westerberg@linux.intel.com>2014-10-24 16:40:54 +0200
committerRafael J. Wysocki <rafael.j.wysocki@intel.com>2014-10-27 18:41:46 +0100
commit52870786ff5d06540efacc64ca8faa74221f10dd (patch)
treeafa970147bf62252ad0792f345f04a1ad706e692 /drivers/ptp
parentcac7f2429872d3733dc3f9915857b1691da2eb2f (diff)
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ACPI: Use ACPI companion to match only the first physical device
Commit 6ab3430129e2 ("mfd: Add ACPI support") made the MFD subdevices share the parent MFD ACPI companion if no _HID/_CID is specified for the subdevice in mfd_cell description. However, since all the subdevices share the ACPI companion, the match and modalias generation logic started to use the ACPI companion as well resulting this: # cat /sys/bus/platform/devices/HID-SENSOR-200041.6.auto/modalias acpi:INT33D1:PNP0C50: instead of the expected one # cat /sys/bus/platform/devices/HID-SENSOR-200041.6.auto/modalias platform:HID-SENSOR-200041 In other words the subdevice modalias is overwritten by the one taken from ACPI companion. This causes udev not to load the driver anymore. It is useful to be able to share the ACPI companion so that MFD subdevices (and possibly other devices as well) can access the ACPI resources even if they do not have ACPI representation in the namespace themselves. An example where this is used is Minnowboard LPC driver that creates GPIO as a subdevice among other things. Without the ACPI companion gpiolib is not able to lookup the corresponding GPIO controller from ACPI GpioIo resource. To fix this, restrict the match and modalias logic to be limited to the first (primary) physical device associated with the given ACPI comapnion. The secondary devices will still be able to access the ACPI companion, but they will be matched in a different way. Fixes: 6ab3430129e2 (mfd: Add ACPI support) Reported-by: Jarkko Nikula <jarkko.nikula@linux.intel.com> Signed-off-by: Mika Westerberg <mika.westerberg@linux.intel.com> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
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