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/Documentation/ABI/testing/
Dsysfs-class-rtc1 What: /sys/class/rtc/
4 Contact: linux-rtc@vger.kernel.org
6 The rtc/ class subdirectory belongs to the RTC subsystem.
8 What: /sys/class/rtc/rtcX/
11 Contact: linux-rtc@vger.kernel.org
13 The /sys/class/rtc/rtc{0,1,2,3,...} directories correspond
14 to each RTC device.
16 What: /sys/class/rtc/rtcX/date
19 Contact: linux-rtc@vger.kernel.org
21 (RO) RTC-provided date in YYYY-MM-DD format
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/Documentation/devicetree/bindings/rtc/
Dallwinner,sun6i-a31-rtc.yaml1 # SPDX-License-Identifier: GPL-2.0
3 ---
4 $id: http://devicetree.org/schemas/rtc/allwinner,sun6i-a31-rtc.yaml#
5 $schema: http://devicetree.org/meta-schemas/core.yaml#
7 title: Allwinner A31 RTC
10 - Chen-Yu Tsai <wens@csie.org>
11 - Maxime Ripard <mripard@kernel.org>
14 "#clock-cells":
19 - enum:
20 - allwinner,sun6i-a31-rtc
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Dingenic,rtc.yaml1 # SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
3 ---
4 $id: http://devicetree.org/schemas/rtc/ingenic,rtc.yaml#
5 $schema: http://devicetree.org/meta-schemas/core.yaml#
7 title: Ingenic SoCs Real-Time Clock
10 - Paul Cercueil <paul@crapouillou.net>
13 - $ref: rtc.yaml#
14 - if:
20 - ingenic,jz4770-rtc
21 - ingenic,jz4780-rtc
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Dmoxa,moxart-rtc.txt1 MOXA ART real-time clock
5 - compatible : Should be "moxa,moxart-rtc"
6 - rtc-sclk-gpios : RTC sclk gpio, with zero flags
7 - rtc-data-gpios : RTC data gpio, with zero flags
8 - rtc-reset-gpios : RTC reset gpio, with zero flags
12 rtc: rtc {
13 compatible = "moxa,moxart-rtc";
14 rtc-sclk-gpios = <&gpio 5 0>;
15 rtc-data-gpios = <&gpio 6 0>;
16 rtc-reset-gpios = <&gpio 7 0>;
Ds3c-rtc.yaml1 # SPDX-License-Identifier: GPL-2.0
3 ---
4 $id: http://devicetree.org/schemas/rtc/s3c-rtc.yaml#
5 $schema: http://devicetree.org/meta-schemas/core.yaml#
10 - Krzysztof Kozlowski <krzk@kernel.org>
15 - enum:
16 - samsung,s3c2410-rtc
17 - samsung,s3c2416-rtc
18 - samsung,s3c2443-rtc
19 - samsung,s3c6410-rtc
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Datmel,at91rm9200-rtc.yaml1 # SPDX-License-Identifier: GPL-2.0
3 ---
4 $id: http://devicetree.org/schemas/rtc/atmel,at91rm9200-rtc.yaml#
5 $schema: http://devicetree.org/meta-schemas/core.yaml#
7 title: Atmel AT91 RTC
10 - $ref: rtc.yaml#
13 - Alexandre Belloni <alexandre.belloni@bootlin.com>
18 - enum:
19 - atmel,at91rm9200-rtc
20 - atmel,at91sam9x5-rtc
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Dnvidia,tegra20-rtc.yaml1 # SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
3 ---
4 $id: http://devicetree.org/schemas/rtc/nvidia,tegra20-rtc.yaml#
5 $schema: http://devicetree.org/meta-schemas/core.yaml#
7 title: NVIDIA Tegra real-time clock
10 - Thierry Reding <thierry.reding@gmail.com>
11 - Jon Hunter <jonathanh@nvidia.com>
14 The Tegra RTC maintains seconds and milliseconds counters, and five
16 from low-power state.
21 - const: nvidia,tegra20-rtc
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Dloongson,rtc.yaml1 # SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
3 ---
4 $id: http://devicetree.org/schemas/rtc/loongson,rtc.yaml#
5 $schema: http://devicetree.org/meta-schemas/core.yaml#
7 title: Loongson Real-Time Clock
10 The Loongson family chips use an on-chip counter 0 (Time Of Year
11 counter) as the RTC.
14 - Binbin Zhou <zhoubinbin@loongson.cn>
17 - $ref: rtc.yaml#
22 - enum:
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Dmarvell,armada-380-rtc.yaml1 # SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause)
3 ---
4 $id: http://devicetree.org/schemas/rtc/marvell,armada-380-rtc.yaml#
5 $schema: http://devicetree.org/meta-schemas/core.yaml#
7 title: RTC controller for the Armada 38x, 7K and 8K SoCs
10 - Javier Carrasco <javier.carrasco.cruz@gmail.com>
13 - $ref: rtc.yaml#
18 - marvell,armada-380-rtc
19 - marvell,armada-8k-rtc
23 - description: RTC base address size
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Dsa1100-rtc.yaml1 # SPDX-License-Identifier: GPL-2.0-only
3 ---
4 $id: http://devicetree.org/schemas/rtc/sa1100-rtc.yaml#
5 $schema: http://devicetree.org/meta-schemas/core.yaml#
10 - $ref: rtc.yaml#
13 - Alessandro Zummo <a.zummo@towertech.it>
14 - Alexandre Belloni <alexandre.belloni@bootlin.com>
15 - Rob Herring <robh@kernel.org>
20 - mrvl,sa1100-rtc
21 - mrvl,mmp-rtc
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Dcirrus,ep9301-rtc.yaml1 # SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
3 ---
4 $id: http://devicetree.org/schemas/rtc/cirrus,ep9301-rtc.yaml#
5 $schema: http://devicetree.org/meta-schemas/core.yaml#
10 - Hartley Sweeten <hsweeten@visionengravers.com>
11 - Alexander Sverdlin <alexander.sverdlin@gmail.com>
14 - $ref: rtc.yaml#
19 - const: cirrus,ep9301-rtc
20 - items:
21 - enum:
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Dqcom-pm8xxx-rtc.yaml1 # SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause)
3 ---
4 $id: http://devicetree.org/schemas/rtc/qcom-pm8xxx-rtc.yaml#
5 $schema: http://devicetree.org/meta-schemas/core.yaml#
7 title: Qualcomm PM8xxx PMIC RTC device
10 - Satya Priya <quic_c_skakit@quicinc.com>
15 - enum:
16 - qcom,pm8058-rtc
17 - qcom,pm8921-rtc
18 - qcom,pm8941-rtc
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Drtc-omap.txt4 - compatible:
5 - "ti,da830-rtc" - for RTC IP used similar to that on DA8xx SoC family.
6 - "ti,am3352-rtc" - for RTC IP used similar to that on AM335x SoC family.
7 This RTC IP has special WAKE-EN Register to enable
11 - "ti,am4372-rtc" - for RTC IP used similar to that on AM437X SoC family.
12 - reg: Address range of rtc register set
13 - interrupts: rtc timer, alarm interrupts in order
16 - system-power-controller: whether the rtc is controlling the system power
18 - clocks: Any internal or external clocks feeding in to rtc
19 - clock-names: Corresponding names of the clocks
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Dst,stm32-rtc.yaml1 # SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
3 ---
4 $id: http://devicetree.org/schemas/rtc/st,stm32-rtc.yaml#
5 $schema: http://devicetree.org/meta-schemas/core.yaml#
10 - Gabriel Fernandez <gabriel.fernandez@foss.st.com>
15 - st,stm32-rtc
16 - st,stm32h7-rtc
17 - st,stm32mp1-rtc
18 - st,stm32mp25-rtc
27 clock-names:
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Dxlnx,zynqmp-rtc.yaml1 # SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
3 ---
4 $id: http://devicetree.org/schemas/rtc/xlnx,zynqmp-rtc.yaml#
5 $schema: http://devicetree.org/meta-schemas/core.yaml#
10 RTC controller for the Xilinx Zynq MPSoC Real Time Clock.
11 The RTC controller has separate IRQ lines for seconds and alarm.
14 - Michal Simek <michal.simek@amd.com>
17 - $ref: rtc.yaml#
22 - const: xlnx,zynqmp-rtc
23 - items:
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Drtc-mt6397.txt1 Device-Tree bindings for MediaTek PMIC based RTC
3 MediaTek PMIC based RTC is an independent function of MediaTek PMIC that works
4 as a type of multi-function device (MFD). The RTC can be configured and set up
15 - compatible: Should be one of follows
16 "mediatek,mt6323-rtc": for MT6323 PMIC
17 "mediatek,mt6358-rtc": for MT6358 PMIC
18 "mediatek,mt6366-rtc", "mediatek,mt6358-rtc": for MT6366 PMIC
19 "mediatek,mt6397-rtc": for MT6397 PMIC
28 rtc {
29 compatible = "mediatek,mt6323-rtc";
Dmediatek,mt7622-rtc.yaml1 # SPDX-License-Identifier: GPL-2.0-only OR BSD-2-Clause
3 ---
4 $id: http://devicetree.org/schemas/rtc/mediatek,mt7622-rtc.yaml#
5 $schema: http://devicetree.org/meta-schemas/core.yaml#
7 title: MediaTek MT7622 on-SoC RTC
10 - $ref: rtc.yaml#
13 - Sean Wang <sean.wang@mediatek.com>
18 - const: mediatek,mt7622-rtc
19 - const: mediatek,soc-rtc
30 clock-names:
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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>
13 This is a list of trivial RTC devices that have simple device tree
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
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Dallwinner,sun4i-a10-rtc.yaml1 # SPDX-License-Identifier: GPL-2.0
3 ---
4 $id: http://devicetree.org/schemas/rtc/allwinner,sun4i-a10-rtc.yaml#
5 $schema: http://devicetree.org/meta-schemas/core.yaml#
7 title: Allwinner A10 RTC
10 - $ref: rtc.yaml#
13 - Chen-Yu Tsai <wens@csie.org>
14 - Maxime Ripard <mripard@kernel.org>
19 - allwinner,sun4i-a10-rtc
20 - allwinner,sun7i-a20-rtc
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Dnxp,lpc1788-rtc.yaml1 # SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause)
3 ---
4 $id: http://devicetree.org/schemas/rtc/nxp,lpc1788-rtc.yaml#
5 $schema: http://devicetree.org/meta-schemas/core.yaml#
7 title: NXP LPC1788 real-time clock
10 The LPC1788 RTC provides calendar and clock functionality
14 - Javier Carrasco <javier.carrasco.cruz@gmail.com>
17 - $ref: rtc.yaml#
21 const: nxp,lpc1788-rtc
28 - description: RTC clock
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Dfsl,stmp3xxx-rtc.yaml1 # SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
3 ---
4 $id: http://devicetree.org/schemas/rtc/fsl,stmp3xxx-rtc.yaml#
5 $schema: http://devicetree.org/meta-schemas/core.yaml#
10 - Javier Carrasco <javier.carrasco.cruz@gmail.com>
13 - $ref: rtc.yaml#
18 - items:
19 - enum:
20 - fsl,imx28-rtc
21 - fsl,imx23-rtc
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Damlogic,meson6-rtc.yaml1 # SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
3 ---
4 $id: http://devicetree.org/schemas/rtc/amlogic,meson6-rtc.yaml#
5 $schema: http://devicetree.org/meta-schemas/core.yaml#
7 title: Amlogic Meson6, Meson8, Meson8b and Meson8m2 RTC
10 - Neil Armstrong <neil.armstrong@linaro.org>
11 - Martin Blumenstingl <martin.blumenstingl@googlemail.com>
14 - $ref: rtc.yaml#
15 - $ref: /schemas/nvmem/nvmem.yaml#
16 - $ref: /schemas/nvmem/nvmem-deprecated-cells.yaml#
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Dmicrochip,mfps-rtc.yaml1 # SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
3 ---
4 $id: http://devicetree.org/schemas/rtc/microchip,mfps-rtc.yaml#
6 $schema: http://devicetree.org/meta-schemas/core.yaml#
8 title: Microchip PolarFire Soc (MPFS) RTC
11 - $ref: rtc.yaml#
14 - Daire McNamara <daire.mcnamara@microchip.com>
15 - Lewis Hanly <lewis.hanly@microchip.com>
20 - microchip,mpfs-rtc
27 - description: |
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Drtc-mxc.yaml1 # SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
3 ---
4 $id: http://devicetree.org/schemas/rtc/rtc-mxc.yaml#
5 $schema: http://devicetree.org/meta-schemas/core.yaml#
10 - $ref: rtc.yaml#
13 - Philippe Reynes <tremyfr@gmail.com>
18 - fsl,imx1-rtc
19 - fsl,imx21-rtc
29 - description: input reference
30 - description: the SoC RTC clock
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/Documentation/admin-guide/
Drtc.rst2 Real Time Clock (RTC) Drivers for Linux
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
12 The newest non-PC hardware tends to just count seconds, like the time(2)
16 Linux has two largely-compatible userspace RTC API families you may
19 * /dev/rtc ... is the RTC provided by PC compatible systems,
20 so it's not very portable to non-x86 systems.
23 supported by a wide variety of RTC chips on all systems.
27 RTCs use the same API to make requests in both RTC frameworks (using
29 same functionality. For example, not every RTC is hooked up to an
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