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Documentation: ACPI: move lpit.txt to firmware-guide/acpi and convert to reST

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This converts the plain text documentation to reStructuredText format
and adds it to Sphinx TOC tree.

No essential content change.

Signed-off-by: Changbin Du <changbin.du@gmail.com>
Reviewed-by: Mauro Carvalho Chehab <mchehab+samsung@kernel.org>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
This commit is contained in:
Changbin Du 2019-04-25 01:53:04 +08:00 • committed by Rafael J. Wysocki
parent 3e57460f00
commit 4887954cac
2 changed files with 14 additions and 5 deletions
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1
Documentation/firmware-guide/acpi/index.rst
View file

@ -22,3 +22,4 @@ ACPI Support
gpio-properties gpio-properties
i2c-muxes i2c-muxes
acpi-lid acpi-lid
lpit

14
Documentation/acpi/lpit.txt → Documentation/firmware-guide/acpi/lpit.rst
View file

@ -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 To enumerate platform Low Power Idle states, Intel platforms are using
“Low Power Idle Table” (LPIT). More details about this table can be “Low Power Idle Table” (LPIT). More details about this table can be
downloaded from: downloaded from:
@ -8,11 +14,13 @@ Residencies for each low power state can be read via FFH
On platforms supporting S0ix sleep states, there can be two types of On platforms supporting S0ix sleep states, there can be two types of
residencies: 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 The following attributes are added dynamically to the cpuidle
sysfs attribute group: sysfs attribute group::
/sys/devices/system/cpu/cpuidle/low_power_idle_cpu_residency_us /sys/devices/system/cpu/cpuidle/low_power_idle_cpu_residency_us
/sys/devices/system/cpu/cpuidle/low_power_idle_system_residency_us /sys/devices/system/cpu/cpuidle/low_power_idle_system_residency_us