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/Documentation/hwmon/
Dg760a.rst19 The GMT G760A Fan Speed PWM Controller is connected directly to a fan
20 and performs closed-loop control of the fan speed.
22 The fan speed is programmed by setting the period via 'pwm1' of two
23 consecutive speed pulses. The period is defined in terms of clock
27 fan to maximum speed.
29 The measured fan rotation speed returned via 'fan1_input' is derived
30 from the measured speed pulse period by assuming again a 32kHz clock
35 speed differs more than 20% with respect to the programmed fan speed;
36 bit 1 is set when fan speed is below 1920 RPM.
Dg762.rst4 The GMT G762 Fan Speed PWM Controller is connected directly to a fan
5 and performs closed-loop or open-loop control of the fan speed. Two
25 set desired fan speed. This only makes sense in closed-loop
26 fan speed control (i.e. when pwm1_enable is set to 2).
49 set current fan speed control mode i.e. 1 for manual fan
50 speed control (open-loop) via pwm1 described below, 2 for
51 automatic fan speed control (closed-loop) via fan1_target
60 it run at full speed.
63 when current fan speed control mode is open-loop ('pwm1_enable' set to 1),
64 the fan speed is programmed by setting a value between 0 and 255 via 'pwm1'
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Dadt7470.rst24 external temperatures. It has four (4) 16-bit counters for measuring fan speed.
25 There are four (4) PWM outputs that can be used to control fan speed.
28 that allows fan speed to be adjusted automatically based on any of the ten
34 Each of the measured inputs (temperature, fan speed) has corresponding high/low
40 automatic fan pwm control to set the fan speed. The driver will not read the
63 - point1: Set the pwm speed at a lower temperature bound.
64 - point2: Set the pwm speed at a higher temperature bound.
66 The ADT7470 will scale the pwm between the lower and higher pwm speed when
68 from 0 (off) to 255 (full speed). Fan speed will be set to maximum when the
Dnct6775.rst106 There are 4 to 5 fan rotation speed sensors, 8 to 15 analog voltage sensors,
120 triggered if the rotation speed has dropped below a programmable limit. On
123 do not have a fan speed divider. The driver sets the most suitable fan divisor
124 itself; specifically, it increases the divider value each time a fan speed
125 reading returns an invalid value, and it reduces it if the fan speed reading
144 - this file stores PWM duty cycle or DC value (fan speed) in range:
146 0 (lowest speed) to 255 (full)
151 * 0 Fan control disabled (fans set to maximum speed)
154 * 3 "Fan Speed Cruise" mode
206 There are no changes to fan speed. Once the temperature leaves the interval, fan
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Dadm9240.rst57 high speed successive approximation ADC allows frequent sampling of all
76 with independent fan speed measurement cycles counting alternating rising
79 DS1780 measurement cycle is about once per second including fan speed.
81 LM81 measurement cycle is about once per 400ms including fan speed.
93 Fan Speed
96 clock via a divider to an 8-bit counter. Fan speed (rpm) is calculated by:
104 - low speed alarm is disabled
106 - auto fan clock adjuster enabled for valid fan speed reading
110 - low speed alarm is enabled
114 - low speed alarm will be asserted if fan speed is
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Dadt7462.rst21 This chip is a bit of a beast. It has 8 counters for measuring fan speed. It
28 that allows fan speed to be adjusted automatically based on any of the three
34 Each of the measured inputs (voltage, temperature, fan speed) has
64 - point1: Set the pwm speed at a lower temperature bound.
65 - point2: Set the pwm speed at a higher temperature bound.
67 The ADT7462 will scale the pwm between the lower and higher pwm speed when
69 from 0 (off) to 255 (full speed). Fan speed will be set to maximum when the
Dasus_rog_ryujin.rst17 (controller) fan speed in RPM, their duties in PWM, as well as coolant temperature.
37 fan1_input Pump speed (in rpm)
38 fan2_input Internal fan speed (in rpm)
39 fan3_input External (controller) fan 1 speed (in rpm)
40 fan4_input External (controller) fan 2 speed (in rpm)
41 fan5_input External (controller) fan 3 speed (in rpm)
42 fan6_input External (controller) fan 4 speed (in rpm)
Dsch5627.rst24 affect the speed of each fan. Setting pwmX_auto_channels_temp to 0 forces
25 the corresponding fan to full speed until another value is written.
38 Controlling fan speed
41 The SCH5627 allows for partially controlling the fan speed. If a temperature
42 channel excedes tempX_max, all fans are forced to maximum speed. The same is not
45 In which way the value of fanX_min affects the fan speed is currently unknown.
Dadt7475.rst59 for measuring fan speed. There are three (3) PWM outputs that can be used
60 to control fan speed.
63 ADT747x that allows fan speed to be adjusted automatically based on any of the
69 Each of the measured inputs (voltage, temperature, fan speed) has
124 Fan Speed Control
129 - point1: Set the PWM speed at the lower temperature bound
130 - point2: Set the PWM speed at the higher temperature bound
133 speed when the temperature is between the two temperature boundaries.
138 fan speed) is applied. PWM values range from 0 (off) to 255 (full speed).
140 Fan speed may be set to maximum when the temperature sensor associated with
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Ddme1737.rst178 manual mode, the fan speed is set by writing the duty-cycle value to the
198 pwm[1-3]_auto_point2_pwm full-speed duty-cycle (255, i.e., 100%)
199 pwm[1-3]_auto_point1_pwm low-speed duty-cycle
200 pwm[1-3]_auto_pwm_min min-speed duty-cycle
202 zone[1-3]_auto_point3_temp full-speed temp (all outputs)
203 zone[1-3]_auto_point2_temp full-speed temp
204 zone[1-3]_auto_point1_temp low-speed temp
205 zone[1-3]_auto_point1_temp_hyst min-speed temp
213 fan either turns completely off or keeps spinning with the low-speed
224 full-speed full-speed full-speed
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Dw83792d.rst44 The driver implements three temperature sensors, seven fan rotation speed
55 For all pwmX outputs, a value of 0 means minimum fan speed and a value of
56 255 means maximum fan speed.
64 triggered if the rotation speed has dropped below a programmable limit. Fan
105 of full speed rotation of corresponding fan.
136 Works as expected. You just need to specify desired PWM/DC value (fan speed)
143 fan speed to keep the temperatures of CPU and the system within specific
146 interval. The fan speed will be lowered as long as the current temperature
149 specific speed set by pwm# and automatically controlled its PWM duty cycle
156 limit (T-tolerance), the fan speed will be fixed at the current speed because
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Daquacomputer_d5next.rst32 speed (in RPM), power, voltage and current. Temperature offsets and fan speeds
35 For the D5 Next pump, available sensors are pump and fan speed, power, voltage
49 as well as eight PWM controllable fans, along with their speed (in RPM), power, voltage
53 sensor and four PWM controllable fans, along with their speed (in RPM), power,
73 with speed, power, voltage and current of both the pump and optionally connected fan.
74 It also exposes pressure and flow speed readings.
98 fan[1-9]_input Pump/fan speed (in RPM) / Flow speed (in dL/h)
99 fan1_min Minimal fan speed (in RPM)
100 fan1_max Maximal fan speed (in RPM)
101 fan1_target Target fan speed (in RPM)
Dadm1026.rst45 16 general purpose digital I/O lines, eight (8) fan speed sensors (8-bit),
59 corresponds to a minimum fan speed. If the limit is exceeded, an interrupt
62 rounding is done. With a divider of 8, the slowest measurable speed of a
83 times a second. Fan speed measurement time depends on fan speed and
86 The ADM1026 has the ability to automatically control fan speed based on the
88 used to control fan speed. Usually only one of these two outputs will be
94 controlling fan speed with the PWM and DAC outputs. The fan speed sensors
/Documentation/ABI/testing/
Dsysfs-bus-pci-drivers-ehci_hcd7 PCI-based EHCI USB controllers (i.e., high-speed USB-2.0
9 "companion" full/low-speed USB-1.1 controllers. When a
10 high-speed device is plugged in, the connection is routed
11 to the EHCI controller; when a full- or low-speed device
15 Sometimes you want to force a high-speed device to connect
16 at full speed, which can be accomplished by forcing the
23 For example: To force the high-speed device attached to
24 port 4 on bus 2 to run at full speed::
28 To return the port to high-speed operation::
39 cannot be used to force a port on a high-speed hub to
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Dsysfs-class-led-trigger-netdev83 Signal the link speed state of 10Mbps of the named network device.
88 speed of 10MBps of the named network device.
91 Present only if the named network device supports 10Mbps link speed.
98 Signal the link speed state of 100Mbps of the named network device.
103 speed of 100Mbps of the named network device.
106 Present only if the named network device supports 100Mbps link speed.
113 Signal the link speed state of 1000Mbps of the named network device.
118 speed of 1000Mbps of the named network device.
121 Present only if the named network device supports 1000Mbps link speed.
128 Signal the link speed state of 2500Mbps of the named network device.
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/Documentation/devicetree/bindings/usb/
Dusb.yaml40 serial is specified and High-Speed Inter-Chip feature if HSIC is
46 maximum-speed:
48 Tells USB controllers we want to work up to a certain speed. In case this
53 - low-speed
54 - full-speed
55 - high-speed
56 - super-speed
57 - super-speed-plus
58 - super-speed-plus-gen2x1
59 - super-speed-plus-gen1x2
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Dcdns,usb3.yaml51 maximum-speed:
52 enum: [super-speed, high-speed, full-speed]
108 maximum-speed = "super-speed";
/Documentation/admin-guide/pm/
Dintel-speed-select.rst4 Intel(R) Speed Select Technology User Guide
7 The Intel(R) Speed Select Technology (Intel(R) SST) provides a powerful new
14 - https://www.intel.com/content/www/us/en/architecture-and-technology/speed-select-technology-artic…
15 - https://builders.intel.com/docs/networkbuilders/intel-speed-select-technology-base-frequency-enha…
21 and configure these features is by using the Intel Speed Select utility.
23 This document explains how to use the Intel Speed Select tool to enumerate and
29 intel-speed-select configuration tool
32 Most Linux distribution packages may include the "intel-speed-select" tool. If not,
38 # cd tools/power/x86/intel-speed-select/
47 # intel-speed-select --help
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/Documentation/devicetree/bindings/phy/
Dnvidia,tegra194-xusb-padctl.yaml21 Some of the lanes are high-speed lanes, which can be used for PCIe, SATA or
22 super-speed USB. Other lanes are for various types of low-speed, full-speed
23 or high-speed USB (such as UTMI, ULPI and HSIC). The XUSB pad controller
379 maximum-speed:
381 supported speed of a USB3 port.
384 - description: The USB3 port supports USB 3.1 Gen 2 speed.
386 const: super-speed-plus
387 - description: The USB3 port supports USB 3.1 Gen 1 speed
389 const: super-speed
399 number to map this super-speed USB port to. The range of
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Dapm-xgene-phy.txt20 supported link speed on the host. Range from 0 to
26 supported link speed on the host. Default is 0.
29 (up to 3) supported link speed on the host. Range is
32 each (up to 3) supported link speed on the host.
37 speed on the host. Range is 0 to 273000 in unit of
41 speed on the host. Range is 0 to 127400 in unit uV.
46 - apm,tx-speed : Tx operating speed. One set of 3-tuple for each
47 supported link speed on the host.
/Documentation/usb/
Dehci.rst7 The EHCI driver is used to talk to high speed USB 2.0 devices using
11 - "High Speed" 480 Mbit/sec (60 MByte/sec)
12 - "Full Speed" 12 Mbit/sec (1.5 MByte/sec)
13 - "Low Speed" 1.5 Mbit/sec
15 USB 1.1 only addressed full speed and low speed. High speed devices
23 (TT) in the hub, which turns low or full speed transactions into
24 high speed "split transactions" that don't waste transfer bandwidth.
33 been available since late 2001, and other kinds of high speed devices
62 High Speed Isochronous (ISO) transfer support is also functional, but
65 Full Speed Isochronous transfer support, through transaction translators,
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/Documentation/devicetree/bindings/net/
Damd-xgbe.txt31 - amd,speed-set: Speed capabilities of the device
39 value corresponding to a particular speed. The first array value represents
40 the setting for the 1GbE speed, the second value for the 2.5GbE speed and
41 the third value for the 10GbE speed. All three values are required if the
46 - amd,serdes-cdr-rate: CDR rate speed selection
69 amd,speed-set = <0>;
/Documentation/driver-api/thermal/
Dnouveau_thermal.rst32 Fan speed is set to 100% when reaching this temperature;
66 The minimum PWM speed allowed;
68 The maximum PWM speed allowed (bypassed when hitting Fan_boost);
73 Speed in RPM of your fan.
78 * 1: The fan can be driven in manual (use pwm1 to change the speed);
82 Be sure to use the manual mode if you want to drive the fan speed manually
86 [PWM_min, PWM_max] range, the reported fan speed (RPM) may not be accurate
/Documentation/devicetree/bindings/clock/
Dxlnx,clocking-wizard.yaml43 xlnx,speed-grade:
47 Speed grade of the device. Higher the speed grade faster is the FPGA device.
62 - xlnx,speed-grade
73 xlnx,speed-grade = <1>;
/Documentation/networking/device_drivers/ethernet/intel/
De1000.rst15 - Speed and Duplex Configuration
40 For more information about the AutoNeg, Duplex, and Speed
41 parameters, see the "Speed and Duplex Configuration" section in
57 This parameter is a bit-mask that specifies the speed and duplex settings
58 advertised by the adapter. When this parameter is used, the Speed and
62 Refer to the Speed and Duplex section of this readme for more
243 Speed section in Command Line Parameters
251 Speed forces the line speed to the specified value in megabits per second
254 speed. Duplex should also be set when Speed is set to either 10 or 100.
335 Speed and Duplex Configuration
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