Hi Heinrich,
On Sun, 25 Oct 2020 at 01:13, Heinrich Schuchardt xypron.glpk@gmx.de wrote:
On a board without hardware clock this software real time clock can be used. The build time is used to initialize the RTC. So you will have to adjust the time either manually using the 'date' command or use the 'sntp' to update the RTC with the time from a network time server. See CONFIG_CMD_SNTP and CONFIG_BOOTP_NTPSERVER. The RTC time is advanced according to CPU ticks.
Signed-off-by: Heinrich Schuchardt xypron.glpk@gmx.de
v2: more elaborate Kconfig message adjust device name properties use build time as initial time
MAINTAINERS | 1 + drivers/rtc/Kconfig | 11 ++++++ drivers/rtc/Makefile | 1 + drivers/rtc/emul_rtc.c | 80 ++++++++++++++++++++++++++++++++++++++++++ 4 files changed, 93 insertions(+) create mode 100644 drivers/rtc/emul_rtc.c
Reviewed-by: Simon Glass sjg@chromium.org
diff --git a/MAINTAINERS b/MAINTAINERS index fc4fad46ee..a98e0c5b76 100644 --- a/MAINTAINERS +++ b/MAINTAINERS @@ -678,6 +678,7 @@ S: Maintained T: git https://gitlab.denx.de/u-boot/custodians/u-boot-efi.git F: doc/api/efi.rst F: doc/uefi/* +F: drivers/rtc/emul_rtc.c F: include/capitalization.h F: include/charset.h F: include/cp1250.h diff --git a/drivers/rtc/Kconfig b/drivers/rtc/Kconfig index 63662001c2..d06d272e14 100644 --- a/drivers/rtc/Kconfig +++ b/drivers/rtc/Kconfig @@ -63,6 +63,17 @@ config RTC_DS3232 Support for Dallas Semiconductor (now Maxim) DS3232 compatible Real Time Clock devices.
+config RTC_EMULATION
bool "Enable emulated RTC"depends on DM_RTChelpOn a board without hardware clock this software real time clock can beused. The build time is used to initialize the RTC. So you will haveto adjust the time either manually using the 'date' command or usethe 'sntp' to update the RTC with the time from a network time server.See CONFIG_CMD_SNTP and CONFIG_BOOTP_NTPSERVER. The RTC time isadvanced according to CPU ticks.config RTC_ISL1208 bool "Enable ISL1208 driver" depends on DM_RTC diff --git a/drivers/rtc/Makefile b/drivers/rtc/Makefile index 12eb449583..ef66dc4bf0 100644 --- a/drivers/rtc/Makefile +++ b/drivers/rtc/Makefile @@ -22,6 +22,7 @@ obj-$(CONFIG_RTC_DS164x) += ds164x.o obj-$(CONFIG_RTC_DS174x) += ds174x.o obj-$(CONFIG_RTC_DS3231) += ds3231.o obj-$(CONFIG_RTC_DS3232) += ds3232.o +obj-$(CONFIG_RTC_EMULATION) += emul_rtc.o obj-$(CONFIG_RTC_FTRTC010) += ftrtc010.o obj-$(CONFIG_SANDBOX) += i2c_rtc_emul.o obj-$(CONFIG_RTC_IMXDI) += imxdi.o diff --git a/drivers/rtc/emul_rtc.c b/drivers/rtc/emul_rtc.c new file mode 100644 index 0000000000..c98c24bbb3 --- /dev/null +++ b/drivers/rtc/emul_rtc.c @@ -0,0 +1,80 @@ +// SPDX-License-Identifier: GPL-2.0+ +/*
- Copyright 2020, Heinrich Schuchardt xypron.glpk@gmx.de
- This driver emulates a real time clock based on timer ticks.
- */
+#include <common.h> +#include <div64.h> +#include <dm.h> +#include <generated/timestamp_autogenerated.h>
put at end
+#include <rtc.h>
+/**
- struct emul_rtc - private data for emulated RTC driver
- */
+struct emul_rtc {
/*** @offset_us: microseconds from 1970-01-01 to timer_get_us() base*/u64 offset_us;/*** @isdst: daylight saving time*/
why not:
/** @.... */
int isdst;+};