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https://github.com/AsahiLinux/u-boot
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fb71c3f490
Up to now the emulated RTC is initialized using the U-Boot build time.
With this patch the environment variable 'rtc_emul_epoch' can be used to
provide a better initial time. The variable is a decimal string with
the number of seconds since 1970-01-01. Here is an example where the RTC
had not been probed yet:
=> setenv rtc_emul_epoch 1610109000
=> date
Date: 2021-01-08 (Friday) Time: 12:30:00
If the variable does not exist, the U-Boot build time is used as fallback.
The environment variable may be set when shutting down the operating system
if the U-Boot environment is exposed to the OS (cf. ENV_IS_IN_FAT and
ENV_IS_IN_EXT4).
Suggested-by: Pablo Sebastián Greco <pgreco@centosproject.org>
Signed-off-by: Heinrich Schuchardt <xypron.glpk@gmx.de>
169 lines
5.2 KiB
Text
169 lines
5.2 KiB
Text
#
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# RTC drivers configuration
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#
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menu "Real Time Clock"
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config DM_RTC
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bool "Enable Driver Model for RTC drivers"
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depends on DM
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select LIB_DATE
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help
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Enable drver model for real-time-clock drivers. The RTC uclass
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then provides the rtc_get()/rtc_set() interface, delegating to
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drivers to perform the actual functions. See rtc.h for a
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description of the API.
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config SPL_DM_RTC
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bool "Enable Driver Model for RTC drivers in SPL"
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depends on SPL_DM
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help
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Enable drver model for real-time-clock drivers. The RTC uclass
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then provides the rtc_get()/rtc_set() interface, delegating to
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drivers to perform the actual functions. See rtc.h for a
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description of the API.
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config TPL_DM_RTC
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bool "Enable Driver Model for RTC drivers in TPL"
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depends on TPL_DM
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help
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Enable drver model for real-time-clock drivers. The RTC uclass
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then provides the rtc_get()/rtc_set() interface, delegating to
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drivers to perform the actual functions. See rtc.h for a
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description of the API.
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config RTC_ENABLE_32KHZ_OUTPUT
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bool "Enable RTC 32Khz output"
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help
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Some real-time clocks support the output of 32kHz square waves (such as ds3231),
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the config symbol choose Real Time Clock device 32Khz output feature.
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config RTC_PCF2127
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bool "Enable PCF2127 driver"
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depends on DM_RTC
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help
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The PCF2127 is a CMOS Real Time Clock (RTC) and calendar with an integrated
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Temperature Compensated Crystal (Xtal) Oscillator (TCXO) and a 32.768 kHz quartz
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crystal optimized for very high accuracy and very low power consumption. The PCF2127
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has a selectable I2C-bus or SPI-bus, a backup battery switch-over circuit, a
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programmable watchdog function, a timestamp function, and many other features.
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config RTC_DS1307
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bool "Enable DS1307 driver"
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depends on DM_RTC
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help
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Support for Dallas Semiconductor (now Maxim) DS1307 and DS1338/9 and
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compatible Real Time Clock devices.
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config RTC_DS3232
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bool "Enable DS3232 driver"
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depends on DM_RTC
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depends on DM_I2C
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help
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Support for Dallas Semiconductor (now Maxim) DS3232 compatible
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Real Time Clock devices.
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config RTC_EMULATION
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bool "Enable emulated RTC"
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depends on DM_RTC
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help
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On a board without hardware clock this software real time clock can be
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used. The initial time may be provided via the environment variable
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'rtc_emul_epoch' as a decimal string indicating seconds since
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1970-01-01. If the environment variable is missing, the build time is
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used to initialize the RTC. The time can be adjusted manually via the
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'date' command or the 'sntp' command can be used to update the RTC
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with the time from a network time server. See CONFIG_CMD_SNTP and
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CONFIG_BOOTP_NTPSERVER. The RTC time is advanced according to CPU
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ticks.
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config RTC_ISL1208
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bool "Enable ISL1208 driver"
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depends on DM_RTC
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help
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The Renesas (formerly Intersil) ISL1208 is a I2C Real Time Clock (RTC) and
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calendar with automatic leap year correction, 2-byte battery backed SRAM,
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automatic power switch-over, alarm function and 15 selectable frequency
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outputs.
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This driver supports reading and writing the RTC/calendar and detects
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total power failures.
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config RTC_PCF8563
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tristate "Philips PCF8563"
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help
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If you say yes here you get support for the Philips PCF8563 RTC
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and compatible chips.
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config RTC_RV3029
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bool "Enable RV3029 driver"
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depends on DM_RTC
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help
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The MicroCrystal RV3029 is a I2C Real Time Clock (RTC) with 8-byte
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battery-backed SRAM.
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This driver supports reading and writing the RTC/calendar and the
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battery-baced SRAM section.
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config RTC_RV8803
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bool "Enable RV8803 driver"
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depends on DM_RTC
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help
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The Micro Crystal RV8803 is a high accuracy, ultra-low power I2C
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Real Time Clock (RTC) with temperature compensation.
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This driver supports reading and writing the RTC/calendar and
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detects total power failures.
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config RTC_RX8010SJ
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bool "Enable RX8010SJ driver"
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depends on DM_RTC
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help
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Support for Epson RX8010SJ Real Time Clock devices.
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config RTC_RX8025
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bool "Enable RX8025 driver"
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help
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Support for Epson RX8025 Real Time Clock devices.
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config RTC_PL031
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bool "Enable ARM AMBA PL031 RTC driver"
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help
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The ARM PrimeCell Real Time Clock (PL031) is an optional SoC
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peripheral based on the Advanced Microcontroller Bus Architecture
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(AMBA). It is emulated in QEMU virtual ARM machines.
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config RTC_MV
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bool "Enable Marvell RTC driver"
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depends on DM_RTC
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help
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Enable Marvell RTC driver. This driver supports the rtc that is present
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on some Marvell SoCs.
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config RTC_S35392A
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bool "Enable S35392A driver"
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select BITREVERSE
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help
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Enable s35392a driver which provides rtc get and set function.
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config RTC_MC146818
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bool "Enable MC146818 driver"
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help
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This is a widely used real-time clock chip originally by Motorola
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and now available from NXP. It includes a battery-backed real-time
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clock with a wide array of features and 50 bytes of general-purpose,
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battery-backed RAM. The driver supports access to the clock and RAM.
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config RTC_M41T62
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bool "Enable M41T62 driver"
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help
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Enable driver for ST's M41T62 compatible RTC devices (like RV-4162).
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It is a serial (I2C) real-time clock (RTC) with alarm.
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config RTC_STM32
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bool "Enable STM32 RTC driver"
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depends on DM_RTC
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help
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Enable STM32 RTC driver. This driver supports the rtc that is present
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on some STM32 SoCs.
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endmenu
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