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| <!-- Set release according to "release" parameter in URL and use RELEASE_THUD_V1.1_DART-6UL as default
| | {{LINUX_RTC}} |
| --> {{#vardefine:RELEASE_PARAM|{{#urlget:release|RELEASE_THUD_V1.1_DART-6UL}}}} <!--
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| --> {{#lst:Yocto_Platform_Customization|{{#var:RELEASE_PARAM}}}} <!--
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| --> {{#lst:B2QT_Platform_Customization|{{#var:RELEASE_PARAM}}}} <!--
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| --> {{PageHeader|{{#var:HARDWARE_NAME}} - Real Time Clock (RTC)}} {{DocImage|category1=Yocto|category2={{#var:HARDWARE_NAME}}}} __toc__
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| = Setting the RTC =
| |
| First set the system date & time:
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| # date --set="20171231 23:59"
| |
| Then set the HW RTC using the system date & time:
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| # hwclock --systohc --utc
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| | |
| Power down your board, wait 5 minutes and power up again, then check you system date & time and verify it is correct:
| |
| # date
| |
| | |
| = Wakeup using the RTC =
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| All Variscite EVKs mount RTC ISL12057, however wakeup using the RTC requires hardware connection of ISL12057 IRQ2# pin to a SoC GPIO.<br>
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| By default, the defconfig of latest kernels already enable the Intersil ISL12057 driver.<br>
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| The kernel configuration item is available in Device Drivers -> Real Time Clock -> <*> Intersil ISL12057.<br>
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| {{#ifeq: {{#var:SOC}} | mx6 |
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| For VAR-SOM-SOLO/VAR-SOM-DUAL/VAR-SOM-MX6 on MX6CustomBoard, SoloCustomBoard and SymphonyBoard, RTC IRQ#2 pin is not connected: RTC has no wakeup capabilities.<br>
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| For DART-MX6 on DT6CustomBoard, RTC IRQ#2 pin is not connected: RTC has no wakeup capabilities.
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| |}}
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| {{#ifeq: {{#var:SOC}} | mx6ul |
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| For DART-6UL on 6ULCustomBoard, RTC IRQ#2 pin is already connected to GPIO5_IO07, as declared in the file arch/arm/boot/dts/imx6ul-imx6ull-var-dart-6ulcustomboard.dtsi
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| <pre>
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| rtc@0x68 {
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| compatible = "dallas,ds1337";
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| reg = <0x68>;
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| pinctrl-names = "default";
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| pinctrl-0 = <&pinctrl_rtc>;
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| interrupt-parent = <&gpio5>;
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| interrupts = <7 IRQ_TYPE_EDGE_FALLING>;
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| };
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| </pre>
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| For VAR-SOM-6UL on ConcertoBoard, you can short pins J14.8 & J14.10 and edit arch/arm/boot/dts/imx6ul-imx6ull-var-som-concerto-board.dtsi to declare GPIO1_IO10 as IRQ#2 pin.
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| <pre>
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| rtc@0x68 {
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| compatible = "dallas,ds1337";
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| reg = <0x68>;
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| pinctrl-names = "default";
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| pinctrl-0 = <&pinctrl_rtc>;
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| interrupt-parent = <&gpio1>;
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| interrupts = <10 IRQ_TYPE_EDGE_FALLING>;
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| };
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| </pre>
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| For VAR-SOM-6UL on SymphonyBoard, RTC IRQ#2 pin is not connected: RTC has no wakeup capabilities.
| |
| |}}
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| {{#ifeq: {{#var:SOC}} | mx7 |
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| For VAR-SOM-MX7 on MX7CustomBoard, RTC IRQ#2 pin is not connected: RTC has no wakeup capabilities.
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| |}}
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| {{#ifeq: {{#var:SOC_SERIES}} | imx8 |
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| {{#ifexpr:{{#rpos:{{#var:HARDWARE_NAME}}|DART}}>-1|
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| For {{#var:HARDWARE_NAME}} on DT8MCustomBoard, RTC IRQ#2 pin is already connected to pin J3.38 of the SoM.<br>
| |
| |}}
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| {{#ifeq: {{#var:SOC}} | mx8mq | |
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| For {{#replace:{{#var:HARDWARE_NAME}}|DART|VAR-SOM}} on SymphonyBoard, RTC IRQ#2 pin is not connected: RTC has no wakeup capabilities.
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| }}
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| |}}
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| | |
| == Using rtcwake command ==
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| Assuming the your board has wakeup capabilities, to set the RTC to wakeup after 10 seconds type:
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| # echo enabled > /sys/class/rtc/rtc0/device/power/wakeup
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| # rtcwake -m mem -d rtc0 -s 10
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| For more options, like waking up at a specific time, run:
| |
| # rtcwake --help
| |
Warning: This page is designed to be used with a 'release' URL parameter.
This page is using the default release RELEASE_THUD_V1.1_DART-6UL.
To view this page for a specific Variscite SoM and software release, please follow these steps:
- Visit variwiki.com
- Select your SoM
- Select the software release
DART-6UL - Real Time Clock (RTC)
Setting the RTC
Please note that starting from kernel 5.x the RTC node in the device tree must not include the IRQ pin declaration if it is not actually connected.
If a wrong declaration is present the hwclock command will fail.
First set the system date & time:
# date --set="20171231 23:59"
Then set the HW RTC using the system date & time:
# hwclock --systohc --utc
Power down your board, wait 5 minutes and power up again, then check you system date & time and verify it is correct:
# date
Wakeup using the RTC
All Variscite EVKs mount RTC ISL12057, however wakeup using the RTC requires hardware connection of ISL12057 IRQ2# pin to a SoC GPIO.
By default, the defconfig of latest kernels already enable the Intersil ISL12057 driver.
The kernel configuration item is available in Device Drivers -> Real Time Clock -> <*> Intersil ISL12057.
For DART-6UL on 6ULCustomBoard, RTC IRQ#2 pin is already connected to GPIO5_IO07, as declared in the file arch/arm/boot/dts/imx6ul-imx6ull-var-dart-6ulcustomboard.dtsi
rtc@0x68 {
compatible = "dallas,ds1337";
reg = <0x68>;
pinctrl-names = "default";
pinctrl-0 = <&pinctrl_rtc>;
interrupt-parent = <&gpio5>;
interrupts = <7 IRQ_TYPE_EDGE_FALLING>;
};
For VAR-SOM-6UL on ConcertoBoard, you can short pins J14.8 & J14.10 and edit arch/arm/boot/dts/imx6ul-imx6ull-var-som-concerto-board.dtsi to declare GPIO1_IO10 as IRQ#2 pin.
rtc@0x68 {
compatible = "dallas,ds1337";
reg = <0x68>;
pinctrl-names = "default";
pinctrl-0 = <&pinctrl_rtc>;
interrupt-parent = <&gpio1>;
interrupts = <10 IRQ_TYPE_EDGE_FALLING>;
};
For VAR-SOM-6UL on SymphonyBoard, RTC IRQ#2 pin is not connected: RTC has no wakeup capabilities.
Using rtcwake command
Assuming the your board implement RTC wakeup capabilities, ensure RTC and system time are synchronized
# hwclock -w
then set the RTC to wakeup after 10 seconds type:
# echo enabled > /sys/class/rtc/rtc0/device/power/wakeup
# echo `date "+%s" -d "+ 10 seconds"` > /sys/class/rtc/rtc0/wakealarm
and immediately suspend the machine
# pm-suspend