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-rw-r--r--Documentation/ABI/testing/sysfs-platform-dptf40
-rw-r--r--Documentation/ABI/testing/sysfs-platform_profile7
2 files changed, 47 insertions, 0 deletions
diff --git a/Documentation/ABI/testing/sysfs-platform-dptf b/Documentation/ABI/testing/sysfs-platform-dptf
index 141834342a4d..53c6b1000320 100644
--- a/Documentation/ABI/testing/sysfs-platform-dptf
+++ b/Documentation/ABI/testing/sysfs-platform-dptf
@@ -111,3 +111,43 @@ Contact: linux-acpi@vger.kernel.org
Description:
(RW) The PCH FIVR (Fully Integrated Voltage Regulator) switching frequency in MHz,
when FIVR clock is 38.4MHz.
+
+What: /sys/bus/platform/devices/INTC1045:00/pch_fivr_switch_frequency/fivr_switching_freq_mhz
+Date: September, 2021
+KernelVersion: v5.15
+Contact: linux-acpi@vger.kernel.org
+Description:
+ (RO) Get the FIVR switching control frequency in MHz.
+
+What: /sys/bus/platform/devices/INTC1045:00/pch_fivr_switch_frequency/fivr_switching_fault_status
+Date: September, 2021
+KernelVersion: v5.15
+Contact: linux-acpi@vger.kernel.org
+Description:
+ (RO) Read the FIVR switching frequency control fault status.
+
+What: /sys/bus/platform/devices/INTC1045:00/pch_fivr_switch_frequency/ssc_clock_info
+Date: September, 2021
+KernelVersion: v5.15
+Contact: linux-acpi@vger.kernel.org
+Description:
+ (RO) Presents SSC (spread spectrum clock) information for EMI
+ (Electro magnetic interference) control. This is a bit mask.
+ Bits Description
+ [7:0] Sets clock spectrum spread percentage:
+ 0x00=0.2% , 0x3F=10%
+ 1 LSB = 0.1% increase in spread (for
+ settings 0x01 thru 0x1C)
+ 1 LSB = 0.2% increase in spread (for
+ settings 0x1E thru 0x3F)
+ [8] When set to 1, enables spread
+ spectrum clock
+ [9] 0: Triangle mode. FFC frequency
+ walks around the Fcenter in a linear
+ fashion
+ 1: Random walk mode. FFC frequency
+ changes randomly within the SSC
+ (Spread spectrum clock) range
+ [10] 0: No white noise. 1: Add white noise
+ to spread waveform
+ [11] When 1, future writes are ignored.
diff --git a/Documentation/ABI/testing/sysfs-platform_profile b/Documentation/ABI/testing/sysfs-platform_profile
index dae9c8941905..baf1d125f9f8 100644
--- a/Documentation/ABI/testing/sysfs-platform_profile
+++ b/Documentation/ABI/testing/sysfs-platform_profile
@@ -26,3 +26,10 @@ Contact: Hans de Goede <hdegoede@redhat.com>
Description: Reading this file gives the current selected profile for this
device. Writing this file with one of the strings from
platform_profile_choices changes the profile to the new value.
+
+ This file can be monitored for changes by polling for POLLPRI,
+ POLLPRI will be signalled on any changes, independent of those
+ changes coming from a userspace write; or coming from another
+ source such as e.g. a hotkey triggered profile change handled
+ either directly by the embedded-controller or fully handled
+ inside the kernel.