Merge branch 'acpi-lpss'

* acpi-lpss:
  ACPI / LPSS: make code less confusing for reader
  ACPI / LPSS: Add support for exposing LTR registers to user space
  ACPI / scan: Add special handler for Intel Lynxpoint LPSS devices

1 files changed, 44 insertions, 0 deletions

diff --git a/Documentation/ABI/testing/sysfs-devices-lpss_ltr b/Documentation/ABI/testing/sysfs-devices-lpss_ltr
new file mode 100644
index 000000000000..ea9298d9bbaf
--- /dev/null
+++ b/Documentation/ABI/testing/sysfs-devices-lpss_ltr
@@ -0,0 +1,44 @@
+What:           /sys/devices/.../lpss_ltr/
+Date:           March 2013
+Contact:        Rafael J. Wysocki <rafael.j.wysocki@intel.com>
+Description:
+                The /sys/devices/.../lpss_ltr/ directory is only present for
+                devices included into the Intel Lynxpoint Low Power Subsystem
+                (LPSS).  If present, it contains attributes containing the LTR
+                mode and the values of LTR registers of the device.
+
+What:           /sys/devices/.../lpss_ltr/ltr_mode
+Date:           March 2013
+Contact:        Rafael J. Wysocki <rafael.j.wysocki@intel.com>
+Description:
+                The /sys/devices/.../lpss_ltr/ltr_mode attribute contains an
+                integer number (0 or 1) indicating whether or not the devices'
+                LTR functionality is working in the software mode (1).
+
+                This attribute is read-only.  If the device's runtime PM status
+                is not "active", attempts to read from this attribute cause
+                -EAGAIN to be returned.
+
+What:           /sys/devices/.../lpss_ltr/auto_ltr
+Date:           March 2013
+Contact:        Rafael J. Wysocki <rafael.j.wysocki@intel.com>
+Description:
+                The /sys/devices/.../lpss_ltr/auto_ltr attribute contains the
+                current value of the device's AUTO_LTR register (raw)
+                represented as an 8-digit hexadecimal number.
+
+                This attribute is read-only.  If the device's runtime PM status
+                is not "active", attempts to read from this attribute cause
+                -EAGAIN to be returned.
+
+What:           /sys/devices/.../lpss_ltr/sw_ltr
+Date:           March 2013
+Contact:        Rafael J. Wysocki <rafael.j.wysocki@intel.com>
+Description:
+                The /sys/devices/.../lpss_ltr/auto_ltr attribute contains the
+                current value of the device's SW_LTR register (raw) represented
+                as an 8-digit hexadecimal number.
+
+                This attribute is read-only.  If the device's runtime PM status
+                is not "active", attempts to read from this attribute cause
+                -EAGAIN to be returned.