From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Google-Smtp-Source: AH8x225AEUhREg1YyQbIt2+cOE78rrZ+MDIDn82DeEIAkeLvib9k7QuS49MjK3afyf3hHSVHnHan ARC-Seal: i=1; a=rsa-sha256; t=1519229783; cv=none; d=google.com; s=arc-20160816; b=Ar8mN1X/5UaxOh0Pj0WdAl11TEmIruguzVQ6dBAn/hW5zDVA7d1akNAHVSRwf9jWcy KlkNVQgrWIioWZsPdiZZ1zhTA+TW7lqEqea4g6o7fLnwW1ag1HQ3XYwFtnKd82lIGHdI opWkpaSH/GdLOv8XAKjG9jHp5CK7VTQ5c4vTLFski4iLlupwvu2+4PuqPwWmrwsuy6jU J/KteLqIpIe/wzVOmbeHna7QMnwugI1y3GcQVAP/phSMKR8gJbz3/7/fM4iF/Re/r0Kw uLJQ1iTymsOOKl4tjDSE6Wk8qUUisKZ2fZYAO70gdktca3dJP2+gs8f91W4oN67tFPgF GSqg== ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=arc-20160816; h=references:in-reply-to:message-id:date:subject:cc:to:from :arc-authentication-results; bh=nGXqX0nw3LnLgY8Izi6V6VspBDW2C3w8ypHrDcDlUvQ=; b=RNmvpGe818DdlwpAfipP16psqCWEqyBknF8qH0sBgW2CaF82NgC/ktO+5V0+RdvbYC cYhxzTx5yRMA08KB9di7QH9tz+4o9UFg83fmiFQbazHfLdfDCqYON2Nrq9zeJRT7sfye WYivFyYSl9xSneXS0tzyuwj+6XoEQiE+JH+fTT7IYSWE3HXeQ0V+MuRkeuqnJwVunFw2 t2PQeh3s/T/a932W8cnTO4ty+QczxzTrlUoE+RTBXk51jxjlfzf5p0/+S6zQ9H/gK1R7 fBF/1rT8mF6mt5DjFpuwr/1oMVLmMRQbIjgwr+9Dcj89a49RD61jT3K9z34e7iYpAUHa LDiw== ARC-Authentication-Results: i=1; mx.google.com; spf=pass (google.com: best guess record for domain of jae.hyun.yoo@linux.intel.com designates 192.55.52.43 as permitted sender) smtp.mailfrom=jae.hyun.yoo@linux.intel.com Authentication-Results: mx.google.com; spf=pass (google.com: best guess record for domain of jae.hyun.yoo@linux.intel.com designates 192.55.52.43 as permitted sender) smtp.mailfrom=jae.hyun.yoo@linux.intel.com X-Amp-Result: SKIPPED(no attachment in message) X-Amp-File-Uploaded: False X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.46,543,1511856000"; d="scan'208";a="29617854" From: Jae Hyun Yoo To: joel@jms.id.au, andrew@aj.id.au, arnd@arndb.de, gregkh@linuxfoundation.org, jdelvare@suse.com, linux@roeck-us.net, benh@kernel.crashing.org, andrew@lunn.ch Cc: linux-kernel@vger.kernel.org, linux-doc@vger.kernel.org, devicetree@vger.kernel.org, linux-hwmon@vger.kernel.org, linux-arm-kernel@lists.infradead.org, openbmc@lists.ozlabs.org, Jae Hyun Yoo Subject: [PATCH v2 6/8] [PATCH 6/8] Documentation: hwmon: Add a document for PECI hwmon client driver Date: Wed, 21 Feb 2018 08:16:04 -0800 Message-Id: <20180221161606.32247-7-jae.hyun.yoo@linux.intel.com> X-Mailer: git-send-email 2.16.1 In-Reply-To: <20180221161606.32247-1-jae.hyun.yoo@linux.intel.com> References: <20180221161606.32247-1-jae.hyun.yoo@linux.intel.com> X-getmail-retrieved-from-mailbox: INBOX X-GMAIL-THRID: =?utf-8?q?1593027890051239231?= X-GMAIL-MSGID: =?utf-8?q?1593027890051239231?= X-Mailing-List: linux-kernel@vger.kernel.org List-ID: This commit adds a hwmon document for a generic PECI hwmon client driver. Signed-off-by: Jae Hyun Yoo --- Documentation/hwmon/peci-hwmon | 73 ++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 73 insertions(+) create mode 100644 Documentation/hwmon/peci-hwmon diff --git a/Documentation/hwmon/peci-hwmon b/Documentation/hwmon/peci-hwmon new file mode 100644 index 000000000000..93e587498536 --- /dev/null +++ b/Documentation/hwmon/peci-hwmon @@ -0,0 +1,73 @@ +Kernel driver peci-hwmon +=============================== + +Supported chips: + Any recent Intel CPU which is connected through a PECI bus. + Addresses scanned: PECI client address 0x30 - 0x37 + Datasheet: Available from http://www.intel.com/design/literature.htm + +Author: + Jae Hyun Yoo + +Description +----------- + +This driver implements a generic PECI hwmon feature which provides Digital +Thermal Sensor (DTS) thermal readings of the CPU package, CPU cores and DIMM +components that are accessible using the PECI Client Command Suite via the +processor PECI client. + +All temperature values are given in millidegree Celsius and will be measurable +only when the target CPU is powered on. + +sysfs attributes +---------------- + +temp1_input Provides current die temperature of the CPU package. +temp1_max Provides thermal control temperature of the CPU package + which is also known as Tcontrol. +temp1_crit Provides shutdown temperature of the CPU package which + is also known as the maximum processor junction + temperature, Tjmax or Tprochot. +temp1_crit_hyst Provides the hysteresis value from Tcontrol to Tjmax of + the CPU package. + +temp2_input Provides current DTS thermal margin to Tcontrol of the + CPU package. Value 0 means it reaches to Tcontrol + temperature. Sub-zero value means the die temperature + goes across Tconrtol to Tjmax. +temp2_min Provides the minimum DTS thermal margin to Tcontrol of + the CPU package. +temp2_lcrit Provides the value when the CPU package temperature + reaches to Tjmax. + +temp3_input Provides current Tcontrol temperature of the CPU + package which is also known as Fan Temperature target. + Indicates the relative value from thermal monitor trip + temperature at which fans should be engaged. +temp3_crit Provides Tcontrol critical value of the CPU package + which is same to Tjmax. + +temp4_input Provides current Tthrottle temperature of the CPU + package. Used for throttling temperature. If this value + is allowed and lower than Tjmax - the throttle will + occur and reported at lower than Tjmax. + +temp5_input Provides the maximum junction temperature, Tjmax of the + CPU package. + +temp_label Provides core temperature if this label indicates + 'Core #'. +temp[n]_input Provides current temperature of each core. +temp[n]_max Provides thermal control temperature of the core. +temp[n]_crit Provides shutdown temperature of the core. +temp[n]_crit_hyst Provides the hysteresis value from Tcontrol to Tjmax of + the core. + +temp_label Provides DDR DIMM temperature if this label indicates + 'DIMM #'. +temp_input Provides current temperature of the DDR DIMM. + +Note: + DIMM temperature group will be appeared when the client CPU's BIOS + completes memory training and testing. -- 2.16.1