From mboxrd@z Thu Jan 1 00:00:00 1970 From: Srinivas Pandruvada Subject: [PATCH] Documentation: cpufreq: Additional interface for acpi-cpufreq Date: Mon, 29 Feb 2016 13:06:25 -0800 Message-ID: <1456779985-20949-1-git-send-email-srinivas.pandruvada@linux.intel.com> Return-path: Received: from mga09.intel.com ([134.134.136.24]:39556 "EHLO mga09.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1750993AbcB2VID (ORCPT ); Mon, 29 Feb 2016 16:08:03 -0500 Sender: linux-pm-owner@vger.kernel.org List-Id: linux-pm@vger.kernel.org To: rjw@rjwysocki.net, viresh.kumar@linaro.org Cc: linux-pm@vger.kernel.org, Srinivas Pandruvada Added new file for acpi-cpufreq driver, with explanation for base_frequency. Signed-off-by: Srinivas Pandruvada --- Documentation/cpu-freq/acpi-cpufreq-addition.txt | 20 ++++++++++++++++++++ 1 file changed, 20 insertions(+) create mode 100644 Documentation/cpu-freq/acpi-cpufreq-addition.txt diff --git a/Documentation/cpu-freq/acpi-cpufreq-addition.txt b/Documentation/cpu-freq/acpi-cpufreq-addition.txt new file mode 100644 index 0000000..40efb22 --- /dev/null +++ b/Documentation/cpu-freq/acpi-cpufreq-addition.txt @@ -0,0 +1,20 @@ +Additional sysfs attribute for acpi-cpufreq + +In addition to the standard sysfs interface as defined in the +user-guide.txt under section "Preferred Interface: sysfs", +acpi-cpufreq can have following additional sysfs attribute: + +base_frequency: Max non-turbo frequency +For example: +scaling_available_frequencies displays list of available frequencies which +can be used to set max/min or current scaling frequency. +>cat scaling_available_frequencies +2301000 2300000 2200000 2000000 1900000 1800000 1700000 1500000 1400000 +1300000 1100000 1000000 900000 800000 600000 500000 +If the base_frequency attribute is present, then any frequency above is +purely opportunistic or turbo frequency. For example +>cat base_frequency +2200000 +Then in the above displayed list of scaling_available_frequencies, any +frequency 2300000 or 2301000 is opportunistic or turbo frequency. + -- 2.5.0