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/Linux-v5.10/Documentation/devicetree/bindings/rtc/
Dtrivial-rtc.yaml1 # SPDX-License-Identifier: GPL-2.0
3 ---
4 $id: http://devicetree.org/schemas/rtc/trivial-rtc.yaml#
5 $schema: http://devicetree.org/meta-schemas/core.yaml#
10 - Alexandre Belloni <alexandre.belloni@bootlin.com>
18 - $ref: "rtc.yaml#"
23 # AB-RTCMC-32.768kHz-B5ZE-S3: Real Time Clock/Calendar Module with I2C Interface
24 - abracon,abb5zes3
25 # AB-RTCMC-32.768kHz-EOZ9: Real Time Clock/Calendar Module with I2C Interface
26 - abracon,abeoz9
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Dpcf8563.txt1 * Philips PCF8563/Epson RTC8564 Real Time Clock
3 Philips PCF8563/Epson RTC8564 Real Time Clock
6 - compatible: Should contain "nxp,pcf8563",
9 - reg: I2C address for chip.
12 - #clock-cells: Should be 0.
13 - clock-output-names:
14 overwrite the default clock name "pcf8563-clkout"
21 #clock-cells = <0>;
Dxlnx-rtc.txt1 * Xilinx Zynq Ultrascale+ MPSoC Real Time Clock
3 RTC controller for the Xilinx Zynq MPSoC Real Time Clock
7 - compatible: Should be "xlnx,zynqmp-rtc"
8 - reg: Physical base address of the controller and length
10 - interrupts: IRQ lines for the RTC.
11 - interrupt-names: interrupt line names eg. "sec" "alarm"
14 - calibration: calibration value for 1 sec period which will
19 compatible = "xlnx,zynqmp-rtc";
21 interrupt-parent = <&gic>;
23 interrupt-names = "alarm", "sec";
Dxgene-rtc.txt1 * APM X-Gene Real Time Clock
3 RTC controller for the APM X-Gene Real Time Clock
6 - compatible : Should be "apm,xgene-rtc"
7 - reg: physical base address of the controller and length of memory mapped
9 - interrupts: IRQ line for the RTC.
10 - #clock-cells: Should be 1.
11 - clocks: Reference to the clock entry.
16 compatible = "fixed-clock";
17 #clock-cells = <1>;
18 clock-frequency = <100000000>;
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/Linux-v5.10/Documentation/scheduler/
Dsched-deadline.rst12 3. Scheduling Real-Time Tasks
18 4.1 System-wide settings
33 system behavior. As for -rt (group) scheduling, it is assumed that root users
50 ------------------
54 "runtime" microseconds of execution time every "period" microseconds, and
57 every time the task wakes up, the scheduler computes a "scheduling deadline"
61 task actually receives "runtime" time units within "deadline" if a proper
70 with the "traditional" real-time task model (see Section 3) can effectively
76 - Each SCHED_DEADLINE task is characterized by the "runtime",
79 - The state of the task is described by a "scheduling deadline", and
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Dsched-rt-group.rst2 Real-Time group scheduling
12 2.1 System-wide settings
28 resolution, or the time it takes to handle the budget refresh itself.
33 are real-time processes).
40 ---------------
43 the amount of bandwidth (eg. CPU time) being constant. In order to schedule
45 of the CPU time available. Without a minimum guarantee a realtime group can
50 ----------------
52 CPU time is divided by means of specifying how much time can be spent running
53 in a given period. We allocate this "run time" for each realtime group which
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/Linux-v5.10/include/linux/mfd/syscon/
Datmel-st.h1 /* SPDX-License-Identifier: GPL-2.0+ */
6 * System Timer (ST) - System peripherals registers.
26 #define AT91_ST_RTMR 0x0c /* Real-time Mode Register */
27 #define AT91_ST_RTPRES 0xffff /* Real-time Prescalar Value */
32 #define AT91_ST_RTTINC BIT(2) /* Real-time Timer Increment */
39 #define AT91_ST_RTAR 0x20 /* Real-time Alarm Register */
42 #define AT91_ST_CRTR 0x24 /* Current Real-time Register */
43 #define AT91_ST_CRTV 0xfffff /* Current Real-Time Value */
/Linux-v5.10/include/linux/
Dtimekeeping.h1 /* SPDX-License-Identifier: GPL-2.0 */
24 * ktime_get() family: read the current time in a multitude of ways,
26 * The default time reference is CLOCK_MONOTONIC, starting at
27 * boot time but not counting the time spent in suspend.
28 * For other references, use the functions with "real", "clocktai",
31 * To get the time in a different format, use the ones wit
34 * See Documentation/core-api/timekeeping.rst for more details.
75 * ktime_get_real - get the real (wall-) time in ktime_t format
88 * ktime_get_boottime - Returns monotonic time since boot in ktime_t format
91 * time spent in suspend.
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/Linux-v5.10/drivers/rtc/
DKconfig1 # SPDX-License-Identifier: GPL-2.0-only
14 bool "Real Time Clock"
26 bool "Set system time from RTC on startup and resume"
29 If you say yes here, the system time (wall clock) will be set using
31 unnecessary fsck runs at boot time, and to network better.
34 string "RTC used to set the system time"
41 device should record time in UTC, since the kernel won't do
44 This clock should be battery-backed, so that it reads the correct
45 time when the system boots from a power-off state. Otherwise, your
49 be useful to reinitialize system time when resuming from system
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Drtc-at91sam9.c1 // SPDX-License-Identifier: GPL-2.0+
3 * "RTT as Real Time Clock" driver for AT91SAM9 SoC family
7 * Based on rtc-at91rm9200.c by Rick Bronson
23 #include <linux/time.h>
28 * to implement the Real Time Clock interfaces
30 * - A "Real-time Timer" (RTT) counts up in seconds from a base time.
33 * - One of the "General Purpose Backup Registers" (GPBRs) holds the
34 * base time, normally an offset from the beginning of the POSIX
35 * epoch (1970-Jan-1 00:00:00 UTC). Some systems also include the
42 * choose from, or a "real" RTC module. All systems have multiple GPBR
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/Linux-v5.10/include/uapi/linux/
Dacct.h1 /* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */
3 * BSD Process Accounting for Linux - Definitions
8 * BSD-style process accounting. The kernel accounting code and all
9 * user-level programs that try to do something useful with the
12 * Copyright (C) 1995 - 1997 Marco van Wieringen - ELM Consultancy B.V.
25 * comp_t is a 16-bit "floating" point number with a 3-bit base 8
26 * exponent and a 13-bit fraction.
27 * comp2_t is 24-bit with 5-bit base 2 exponent and 20 bit fraction
49 __u16 ac_uid16; /* LSB of Real User ID */
50 __u16 ac_gid16; /* LSB of Real Group ID */
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/Linux-v5.10/Documentation/devicetree/bindings/arm/
Datmel-sysregs.txt4 - compatible: Should be "atmel,sama5d2-chipid"
5 - reg : Should contain registers location and length
8 - compatible: Should be "atmel,at91sam9260-pit"
9 - reg: Should contain registers location and length
10 - interrupts: Should contain interrupt for the PIT which is the IRQ line
14 - compatible: Should be "microchip,sam9x60-pit64b"
15 - reg: Should contain registers location and length
16 - interrupts: Should contain interrupt for PIT64B timer
17 - clocks: Should contain the available clock sources for PIT64B timer.
20 - compatible: Should be "atmel,at91rm9200-st", "syscon", "simple-mfd"
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/Linux-v5.10/Documentation/vm/
Dactive_mm.rst9 List: linux-kernel
12 Date: 1999-07-30 21:36:24
14 Cc'd to linux-kernel, because I don't write explanations all that often,
21 > discussed on the mailing lists---I just returned from vacation and
22 > wasn't able to follow linux-kernel for a while).
26 - we have "real address spaces" and "anonymous address spaces". The
28 user-level page tables at all, so when we do a context switch into an
33 doesn't need any user mappings - all kernel threads basically fall into
34 this category, but even "real" threads can temporarily say that for
35 some amount of time they are not going to be interested in user space,
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/Linux-v5.10/Documentation/sound/designs/
Dseq-oss.rst15 What this does - it provides the emulation of the OSS sequencer, access
53 However, each MIDI device is exclusive - that is, if a MIDI device
57 * Real-time event processing:
59 The events can be processed in real time without using out of bound
60 ioctl. To switch to real-time mode, send ABSTIME 0 event. The followed
61 events will be processed in real-time without queued. To switch off the
62 real-time mode, send RELTIME 0 event.
67 ``/proc/asound/seq/oss`` at any time. In the later version,
74 Run configure script with both sequencer support (``--with-sequencer=yes``)
75 and OSS emulation (``--with-oss=yes``) options. A module ``snd-seq-oss.o``
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/Linux-v5.10/kernel/
DKconfig.preempt1 # SPDX-License-Identifier: GPL-2.0-only
12 time, but there are no guarantees and occasional longer delays
39 bool "Preemptible Kernel (Low-Latency Desktop)"
59 bool "Fully Preemptible Kernel (Real-Time)"
63 This option turns the kernel into a real-time kernel by replacing
65 preemptible priority-inheritance aware variants, enforcing
67 non-preemptible sections. This makes the kernel, except for very
73 require real-time guarantees.
/Linux-v5.10/Documentation/timers/
Dno_hz.rst2 NO_HZ: Reducing Scheduling-Clock Ticks
7 reduce the number of scheduling-clock interrupts, thereby improving energy
9 some types of computationally intensive high-performance computing (HPC)
10 applications and for real-time applications.
12 There are three main ways of managing scheduling-clock interrupts
13 (also known as "scheduling-clock ticks" or simply "ticks"):
15 1. Never omit scheduling-clock ticks (CONFIG_HZ_PERIODIC=y or
16 CONFIG_NO_HZ=n for older kernels). You normally will -not-
19 2. Omit scheduling-clock ticks on idle CPUs (CONFIG_NO_HZ_IDLE=y or
23 3. Omit scheduling-clock ticks on CPUs that are either idle or that
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/Linux-v5.10/arch/m68k/bvme6000/
Drtc.c1 // SPDX-License-Identifier: GPL-2.0
3 * Real Time Clock interface for Linux on the BVME6000
48 case RTC_RD_TIME: /* Read the time/date from RTC */ in rtc_ioctl()
51 /* Ensure clock and real-time-mode-register are accessible */ in rtc_ioctl()
52 msr = rtc->msr & 0xc0; in rtc_ioctl()
53 rtc->msr = 0x40; in rtc_ioctl()
56 wtime.tm_sec = bcd2bin(rtc->bcd_sec); in rtc_ioctl()
57 wtime.tm_min = bcd2bin(rtc->bcd_min); in rtc_ioctl()
58 wtime.tm_hour = bcd2bin(rtc->bcd_hr); in rtc_ioctl()
59 wtime.tm_mday = bcd2bin(rtc->bcd_dom); in rtc_ioctl()
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/Linux-v5.10/kernel/rcu/
DKconfig1 # SPDX-License-Identifier: GPL-2.0-only
3 # RCU-related configuration options
24 thousands of CPUs, but for which real-time response
35 designed for UP systems from which real-time response
40 bool "Make expert-level adjustments to RCU configuration"
44 expert-level adjustments to RCU configuration. By default,
45 no such adjustments can be made, which has the often-beneficial
46 side-effect of preventing "make oldconfig" from asking you all
50 Say Y if you need to make expert-level adjustments to RCU.
58 permits arbitrary sleeping or blocking within RCU read-side critical
[all …]
/Linux-v5.10/arch/sparc/include/asm/
Dhypervisor.h1 /* SPDX-License-Identifier: GPL-2.0 */
16 * -----------------------------------------------
23 * -----------------------------------------------
25 * The second type are "hyper-fast traps" which encode the function
27 * numbers > 0x80. The register usage for hyper-fast traps is as
30 * -----------------------------------------------
36 * -----------------------------------------------
44 * defined below. So, for example, if a hyper-fast trap takes
49 * is invalid, HV_EBADTRAP will be returned in %o0. Also, all 64-bits
63 #define HV_ENORADDR 2 /* Invalid real address */
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/Linux-v5.10/Documentation/devicetree/bindings/soc/ti/
Dti,pruss.yaml1 # SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
3 ---
5 $schema: http://devicetree.org/meta-schemas/core.yaml#
8 TI Programmable Real-Time Unit and Industrial Communication Subsystem
11 - Suman Anna <s-anna@ti.com>
15 The Programmable Real-Time Unit and Industrial Communication Subsystem
16 (PRU-ICSS a.k.a. PRUSS) is present on various TI SoCs such as AM335x, AM437x,
17 Keystone 66AK2G, OMAP-L138/DA850 etc. A PRUSS consists of dual 32-bit RISC
18 cores (Programmable Real-Time Units, or PRUs), shared RAM, data and
23 peripheral interfaces, fast real-time responses, or specialized data handling.
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/Linux-v5.10/Documentation/ABI/testing/
Dsysfs-class-rtc-rtc0-device-rtc_calibration5 Description: Attribute for calibrating ST-Ericsson AB8500 Real Time Clock
7 calibrate the AB8500.s 32KHz Real Time Clock.
11 The range of the attribute is -127 to +127 in units of
12 30.5 micro-seconds (half-parts-per-million of the 32KHz clock)
13 Users: The /vendor/st-ericsson/base_utilities/core/rtc_calibration
/Linux-v5.10/Documentation/block/
Dbfq-iosched.rst5 BFQ is a proportional-share I/O scheduler, with some extra
6 low-latency capabilities. In addition to cgroups support (blkio or io
9 - BFQ guarantees a high system and application responsiveness, and a
10 low latency for time-sensitive applications, such as audio or video
12 - BFQ distributes bandwidth, and not just time, among processes or
13 groups (switching back to time distribution when needed to keep
19 goal, for a given device, is to achieve the maximum-possible
20 throughput at all times, then do switch off all low-latency heuristics
25 As every I/O scheduler, BFQ adds some overhead to per-I/O-request
27 single-lock-protected, per-request processing time of BFQ---i.e., the
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/Linux-v5.10/arch/m68k/mvme16x/
Drtc.c1 // SPDX-License-Identifier: GPL-2.0
3 * Real Time Clock interface for Linux on the MVME16x
46 case RTC_RD_TIME: /* Read the time/date from RTC */ in rtc_ioctl()
49 /* Ensure clock and real-time-mode-register are accessible */ in rtc_ioctl()
50 rtc->ctrl = RTC_READ; in rtc_ioctl()
52 wtime.tm_sec = bcd2bin(rtc->bcd_sec); in rtc_ioctl()
53 wtime.tm_min = bcd2bin(rtc->bcd_min); in rtc_ioctl()
54 wtime.tm_hour = bcd2bin(rtc->bcd_hr); in rtc_ioctl()
55 wtime.tm_mday = bcd2bin(rtc->bcd_dom); in rtc_ioctl()
56 wtime.tm_mon = bcd2bin(rtc->bcd_mth)-1; in rtc_ioctl()
[all …]
/Linux-v5.10/Documentation/admin-guide/
Drtc.rst2 Real Time Clock (RTC) Drivers for Linux
5 When Linux developers talk about a "Real Time Clock", they usually mean
6 something that tracks wall clock time and is battery backed so that it
8 the local time zone or daylight savings time -- unless they dual boot
9 with MS-Windows -- but will instead be set to Coordinated Universal Time
10 (UTC, formerly "Greenwich Mean Time").
12 The newest non-PC hardware tends to just count seconds, like the time(2)
13 system call reports, but RTCs also very commonly represent time using
14 the Gregorian calendar and 24 hour time, as reported by gmtime(3).
16 Linux has two largely-compatible userspace RTC API families you may
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/Linux-v5.10/drivers/power/reset/
Dat91-poweroff.c5 * Copyright (C) 2011 Jean-Christophe PLAGNIOL-VILLARD <plagnioj@jcrosoft.com>
28 #define AT91_SHDW_WKMODE0 GENMASK(2, 0) /* Wake-up 0 Mode Selection */
32 #define AT91_SHDW_RTTWKEN BIT(16) /* Real Time Timer Wake-up Enable */
33 #define AT91_SHDW_RTCWKEN BIT(17) /* Real Time Clock Wake-up Enable */
36 #define AT91_SHDW_WAKEUP0 BIT(0) /* Wake-up 0 Status */
37 #define AT91_SHDW_RTTWK BIT(16) /* Real-time Timer Wake-up */
38 #define AT91_SHDW_RTCWK BIT(17) /* Real-time Clock Wake-up [SAM9RL] */
65 /* Simple power-on, just bail out */ in at91_wakeup_status()
76 dev_info(&pdev->dev, "Wake-Up source: %s\n", reason); in at91_wakeup_status()
110 err = of_property_read_string(np, "atmel,wakeup-mode", &pm); in at91_poweroff_get_wakeup_mode()
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