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-rw-r--r--Documentation/firmware-guide/acpi/index.rst1
-rw-r--r--Documentation/firmware-guide/acpi/lpit.rst (renamed from Documentation/acpi/lpit.txt)18
2 files changed, 14 insertions, 5 deletions
diff --git a/Documentation/firmware-guide/acpi/index.rst b/Documentation/firmware-guide/acpi/index.rst
index fca854f017d8..0e60f4b7129a 100644
--- a/Documentation/firmware-guide/acpi/index.rst
+++ b/Documentation/firmware-guide/acpi/index.rst
@@ -22,3 +22,4 @@ ACPI Support
gpio-properties
i2c-muxes
acpi-lid
+ lpit
diff --git a/Documentation/acpi/lpit.txt b/Documentation/firmware-guide/acpi/lpit.rst
index b426398d2e97..aca928fab027 100644
--- a/Documentation/acpi/lpit.txt
+++ b/Documentation/firmware-guide/acpi/lpit.rst
@@ -1,3 +1,9 @@
+.. SPDX-License-Identifier: GPL-2.0
+
+===========================
+Low Power Idle Table (LPIT)
+===========================
+
To enumerate platform Low Power Idle states, Intel platforms are using
“Low Power Idle Table” (LPIT). More details about this table can be
downloaded from:
@@ -8,13 +14,15 @@ Residencies for each low power state can be read via FFH
On platforms supporting S0ix sleep states, there can be two types of
residencies:
-- CPU PKG C10 (Read via FFH interface)
-- Platform Controller Hub (PCH) SLP_S0 (Read via memory mapped interface)
+
+ - CPU PKG C10 (Read via FFH interface)
+ - Platform Controller Hub (PCH) SLP_S0 (Read via memory mapped interface)
The following attributes are added dynamically to the cpuidle
-sysfs attribute group:
- /sys/devices/system/cpu/cpuidle/low_power_idle_cpu_residency_us
- /sys/devices/system/cpu/cpuidle/low_power_idle_system_residency_us
+sysfs attribute group::
+
+ /sys/devices/system/cpu/cpuidle/low_power_idle_cpu_residency_us
+ /sys/devices/system/cpu/cpuidle/low_power_idle_system_residency_us
The "low_power_idle_cpu_residency_us" attribute shows time spent
by the CPU package in PKG C10