Searched +full:system +full:- +full:clock +full:- +full:frequency (Results 1 – 25 of 158) sorted by relevance
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| /Documentation/virt/hyperv/ |
| D | clocks.rst | 1 .. SPDX-License-Identifier: GPL-2.0
7 -----
8 On arm64, Hyper-V virtualizes the ARMv8 architectural system counter
12 architectural system counter is functional in guest VMs on Hyper-V.
13 While Hyper-V also provides a synthetic system clock and four synthetic
14 per-CPU timers as described in the TLFS, they are not used by the
15 Linux kernel in a Hyper-V guest on arm64. However, older versions
16 of Hyper-V for arm64 only partially virtualize the ARMv8
19 Linux kernel versions on these older Hyper-V versions requires an
20 out-of-tree patch to use the Hyper-V synthetic clocks/timers instead.
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| /Documentation/driver-api/media/ |
| D | camera-sensor.rst | 1 .. SPDX-License-Identifier: GPL-2.0
8 This document covers the in-kernel APIs only. For the best practices on
12 CSI-2, parallel and BT.656 buses
13 --------------------------------
15 Please see :ref:`transmitter-receiver`.
18 ---------------
20 Camera sensors have an internal clock tree including a PLL and a number of
21 divisors. The clock tree is generally configured by the driver based on a few
22 input parameters that are specific to the hardware: the external clock frequency
23 and the link frequency. The two parameters generally are obtained from system
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| /Documentation/timers/ |
| D | timekeeping.rst | 2 Clock sources, Clock events, sched_clock() and delay timers
10 If you grep through the kernel source you will find a number of architecture-
11 specific implementations of clock sources, clockevents and several likewise
12 architecture-specific overrides of the sched_clock() function and some
15 To provide timekeeping for your platform, the clock source provides
16 the basic timeline, whereas clock events shoot interrupts on certain points
17 on this timeline, providing facilities such as high-resolution timers.
22 Clock sources
23 -------------
25 The purpose of the clock source is to provide a timeline for the system that
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| /Documentation/devicetree/bindings/clock/ |
| D | nvidia,tegra124-car.yaml | 1 # SPDX-License-Identifier: (GPL-2.0+ OR BSD-2-Clause)
3 ---
4 $id: http://devicetree.org/schemas/clock/nvidia,tegra124-car.yaml#
5 $schema: http://devicetree.org/meta-schemas/core.yaml#
7 title: NVIDIA Tegra Clock and Reset Controller
10 - Jon Hunter <jonathanh@nvidia.com>
11 - Thierry Reding <thierry.reding@gmail.com>
14 The Clock and Reset (CAR) is the HW module responsible for muxing and gating
18 the clock source programming and most of the clock dividers.
20 CLKGEN input signals include the external clock for the reference frequency
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| D | lpc1850-cgu.txt | 1 * NXP LPC1850 Clock Generation Unit (CGU)
4 peripheral blocks of the LPC18xx. Each independent clock is called
5 a base clock and itself is one of the inputs to the two Clock
9 The CGU selects the inputs to the clock generators from multiple
10 clock sources, controls the clock generation, and routes the outputs
11 of the clock generators through the clock source bus to the output
12 stages. Each output stage provides an independent clock source and
15 - Above text taken from NXP LPC1850 User Manual.
18 This binding uses the common clock binding:
19 Documentation/devicetree/bindings/clock/clock-bindings.txt
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| D | renesas,emev2-smu.yaml | 1 # SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
3 ---
4 $id: http://devicetree.org/schemas/clock/renesas,emev2-smu.yaml#
5 $schema: http://devicetree.org/meta-schemas/core.yaml#
7 title: Renesas EMMA Mobile EV2 System Management Unit
10 - Geert Uytterhoeven <geert+renesas@glider.be>
11 - Magnus Damm <magnus.damm@gmail.com>
14 The System Management Unit is described in user's manual R19UH0037EJ1000_SMU.
15 This is not a clock provider, but clocks under SMU depend on it.
19 const: renesas,emev2-smu
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| /Documentation/devicetree/bindings/timer/ |
| D | arm,armv7m-systick.yaml | 1 # SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
3 ---
4 $id: http://devicetree.org/schemas/timer/arm,armv7m-systick.yaml#
5 $schema: http://devicetree.org/meta-schemas/core.yaml#
7 title: ARMv7M System Timer
10 - Alexandre Torgue <alexandre.torgue@foss.st.com>
11 - Fabrice Gasnier <fabrice.gasnier@foss.st.com>
13 description: ARMv7-M includes a system timer, known as SysTick.
17 const: arm,armv7m-systick
25 clock-frequency: true
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| D | brcm,bcm2835-system-timer.yaml | 1 # SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
3 ---
4 $id: http://devicetree.org/schemas/timer/brcm,bcm2835-system-timer.yaml#
5 $schema: http://devicetree.org/meta-schemas/core.yaml#
7 title: BCM2835 System Timer
10 - Stefan Wahren <wahrenst@gmx.net>
11 - Raspberry Pi Kernel Maintenance <kernel-list@raspberrypi.com>
14 The System Timer peripheral provides four 32-bit timer channels and a
15 single 64-bit free running counter. Each channel has an output compare
21 const: brcm,bcm2835-system-timer
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| /Documentation/devicetree/bindings/i2c/ |
| D | i2c-img-scb.txt | 4 - compatible: "img,scb-i2c"
5 - reg: Physical base address and length of controller registers
6 - interrupts: Interrupt number used by the controller
7 - clocks : Should contain a clock specifier for each entry in clock-names
8 - clock-names : Should contain the following entries:
9 "scb", for the SCB core clock.
10 "sys", for the system clock.
11 - clock-frequency: The I2C bus frequency in Hz
12 - #address-cells: Should be <1>
13 - #size-cells: Should be <0>
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| D | i2c-pca-platform.txt | 4 parallel-bus microcontrollers/microprocessors and the serial I2C-bus
5 and allows the parallel bus system to communicate bi-directionally
6 with the I2C-bus.
10 - reg : Offset and length of the register set for the device
11 - compatible : one of "nxp,pca9564" or "nxp,pca9665"
14 - interrupts : the interrupt number
15 - reset-gpios : gpio specifier for gpio connected to RESET_N pin. As the line
17 - clock-frequency : I2C bus frequency.
22 #address-cells = <1>;
23 #size-cells = <0>;
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| D | nuvoton,npcm7xx-i2c.yaml | 1 # SPDX-License-Identifier: GPL-2.0-only OR BSD-2-Clause
3 ---
4 $id: http://devicetree.org/schemas/i2c/nuvoton,npcm7xx-i2c.yaml#
5 $schema: http://devicetree.org/meta-schemas/core.yaml#
15 - Tali Perry <tali.perry1@gmail.com>
20 - nuvoton,npcm750-i2c
21 - nuvoton,npcm845-i2c
31 description: Reference clock for the I2C bus
33 clock-frequency:
34 description: Desired I2C bus clock frequency in Hz. If not specified,
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| D | st,nomadik-i2c.yaml | 1 # SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
3 ---
4 $id: http://devicetree.org/schemas/i2c/st,nomadik-i2c.yaml#
5 $schema: http://devicetree.org/meta-schemas/core.yaml#
11 STn8815. It was part of the prototype STn8500 which then became ST-Ericsson
15 - Linus Walleij <linus.walleij@linaro.org>
23 - st,nomadik-i2c
24 - mobileye,eyeq5-i2c
26 - compatible
31 - items:
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| D | snps,designware-i2c.yaml | 1 # SPDX-License-Identifier: GPL-2.0-only
3 ---
4 $id: http://devicetree.org/schemas/i2c/snps,designware-i2c.yaml#
5 $schema: http://devicetree.org/meta-schemas/core.yaml#
10 - Jarkko Nikula <jarkko.nikula@linux.intel.com>
13 - $ref: /schemas/i2c/i2c-controller.yaml#
14 - if:
19 const: mscc,ocelot-i2c
28 - description: Generic Synopsys DesignWare I2C controller
29 const: snps,designware-i2c
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| /Documentation/devicetree/bindings/net/ |
| D | ti,cc1352p7.yaml | 1 # SPDX-License-Identifier: GPL-2.0-only OR BSD-2-Clause
3 ---
5 $schema: http://devicetree.org/meta-schemas/core.yaml#
13 - Ayush Singh <ayushdevel1325@gmail.com>
21 - description: high-frequency main system (MCU and peripherals) clock
22 - description: low-frequency system clock
24 clock-names:
26 - const: sclk_hf
27 - const: sclk_lf
29 reset-gpios:
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| /Documentation/devicetree/bindings/memory-controllers/ |
| D | nvidia,tegra30-mc.yaml | 1 # SPDX-License-Identifier: (GPL-2.0)
3 ---
4 $id: http://devicetree.org/schemas/memory-controllers/nvidia,tegra30-mc.yaml#
5 $schema: http://devicetree.org/meta-schemas/core.yaml#
10 - Dmitry Osipenko <digetx@gmail.com>
11 - Jon Hunter <jonathanh@nvidia.com>
12 - Thierry Reding <thierry.reding@gmail.com>
18 clock from a group of clients. Typically, a system has a single Arbitration
20 Arbitration Domains to increase the effective system bandwidth.
22 Protocol Arbiter, which manage a related pool of memory devices. A system
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| /Documentation/devicetree/bindings/remoteproc/ |
| D | st-rproc.txt | 1 STMicroelectronics Co-Processor Bindings
2 ----------------------------------------
6 Co-processors can be controlled from the bootloader or the primary OS. If
7 the bootloader starts a co-processor, the primary OS must detect its state
11 - compatible Should be one of:
12 "st,st231-rproc"
13 "st,st40-rproc"
14 - memory-region Reserved memory (See: ../reserved-memory/reserved-memory.txt)
15 - resets Reset lines (See: ../reset/reset.txt)
16 - reset-names Must be "sw_reset" and "pwr_reset"
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| /Documentation/devicetree/bindings/ptp/ |
| D | fsl,ptp.yaml | 1 # SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
3 ---
5 $schema: http://devicetree.org/meta-schemas/core.yaml#
7 title: Freescale QorIQ 1588 timer based PTP clock
10 - Frank Li <Frank.Li@nxp.com>
15 - enum:
16 - fsl,etsec-ptp
17 - fsl,fman-ptp-timer
18 - fsl,dpaa2-ptp
19 - items:
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| /Documentation/misc-devices/ |
| D | ics932s401.rst | 18 -----------
22 This chip has 4 clock outputs--a base clock for the CPU (which is likely
23 multiplied to get the real CPU clock), a system clock, a PCI clock, a USB
24 clock, and a reference clock. The driver reports selected and actual
25 frequency. If spread spectrum mode is enabled, the driver also reports by what
26 percent the clock signal is being spread, which should be between 0 and -0.5%.
33 ----------------
35 The clocks could be reprogrammed to increase system speed. I will not help you
36 do this, as you risk damaging your system!
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| /Documentation/devicetree/bindings/sound/ |
| D | audio-graph-port.yaml | 1 # SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
3 ---
4 $id: http://devicetree.org/schemas/sound/audio-graph-port.yaml#
5 $schema: http://devicetree.org/meta-schemas/core.yaml#
10 - Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>
15 port-base:
17 - $ref: /schemas/graph.yaml#/$defs/port-base
18 - $ref: /schemas/sound/dai-params.yaml#
20 mclk-fs:
21 $ref: simple-card.yaml#/definitions/mclk-fs
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| D | simple-card.yaml | 1 # SPDX-License-Identifier: GPL-2.0
3 ---
4 $id: http://devicetree.org/schemas/sound/simple-card.yaml#
5 $schema: http://devicetree.org/meta-schemas/core.yaml#
10 - Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>
14 frame-master:
15 description: Indicates dai-link frame master.
18 bitclock-master:
19 description: Indicates dai-link bit clock master
22 frame-inversion:
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| /Documentation/devicetree/bindings/mfd/ |
| D | cirrus,lochnagar.yaml | 1 # SPDX-License-Identifier: GPL-2.0-only OR BSD-2-Clause
3 ---
5 $schema: http://devicetree.org/meta-schemas/core.yaml#
10 - patches@opensource.cirrus.com
15 Logic devices on mini-cards, as well as allowing connection of
17 platform. Audio system topology, clocking and power can all be
25 [2] include/dt-bindings/pinctrl/lochnagar.h
26 [3] include/dt-bindings/clock/lochnagar.h
28 And these documents for the required sub-node binding details:
29 [4] Clock: ../clock/cirrus,lochnagar.yaml
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| /Documentation/devicetree/bindings/spi/ |
| D | ti,qspi.yaml | 1 # SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
3 ---
5 $schema: http://devicetree.org/meta-schemas/core.yaml#
10 - Kousik Sanagavarapu <five231003@gmail.com>
13 - $ref: spi-controller.yaml#
18 - ti,am4372-qspi
19 - ti,dra7xxx-qspi
23 - description: base registers
24 - description: mapped memory
26 reg-names:
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| /Documentation/devicetree/bindings/arm/calxeda/ |
| D | hb-sregs.yaml | 1 # SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
3 ---
4 $id: http://devicetree.org/schemas/arm/calxeda/hb-sregs.yaml#
5 $schema: http://devicetree.org/meta-schemas/core.yaml#
7 title: Calxeda Highbank system registers
10 The Calxeda Highbank system has a block of MMIO registers controlling
11 several generic system aspects. Those can be used to control some power
15 - Andre Przywara <andre.przywara@arm.com>
19 const: calxeda,hb-sregs
28 - compatible
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| /Documentation/ABI/testing/ |
| D | sysfs-devices-system-cpu | 1 What: /sys/devices/system/cpu/
2 Date: pre-git history
3 Contact: Linux kernel mailing list <linux-kernel@vger.kernel.org>
10 /sys/devices/system/cpu/cpuX/
12 What: /sys/devices/system/cpu/kernel_max
13 /sys/devices/system/cpu/offline
14 /sys/devices/system/cpu/online
15 /sys/devices/system/cpu/possible
16 /sys/devices/system/cpu/present
18 Contact: Linux kernel mailing list <linux-kernel@vger.kernel.org>
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| /Documentation/devicetree/bindings/net/can/ |
| D | mpc5xxx-mscan.txt | 2 ------------------------
4 (c) 2006-2009 Secret Lab Technologies Ltd
7 fsl,mpc5200-mscan nodes
8 -----------------------
9 In addition to the required compatible-, reg- and interrupt-properties, you can
10 also specify which clock source shall be used for the controller:
12 - fsl,mscan-clock-source : a string describing the clock source. Valid values
13 are: "ip" for ip bus clock
14 "ref" for reference clock (XTAL)
18 fsl,mpc5121-mscan nodes
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