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CONFIG_RTC_DRV_DS1307: Dallas/Maxim DS1307/37/38/39/40, ST M41T00, EPSON RX-8025

General informations

The Linux kernel configuration item CONFIG_RTC_DRV_DS1307 has multiple definitions:

Dallas/Maxim DS1307 and similar I2C RTC chips found in drivers/rtc/Kconfig

The configuration item CONFIG_RTC_DRV_DS1307:

Help text

If you say yes here you get support for various compatible RTC chips (often with battery backup) connected with I2C. This driver should handle DS1307, DS1337, DS1338, DS1339, DS1340, ST M41T00, and probably other chips. In some cases the RTC must already have been initialized (by manufacturing or a bootloader).

The first seven registers on these chips hold an RTC, and other registers may add features such as NVRAM, a trickle charger for the RTC/NVRAM backup power, and alarms. This driver may not expose all those available chip features.

This driver can also be built as a module. If so, the module will be called rtc-ds1307.

Dallas/Maxim DS1307/37/38/39/40, ST M41T00, EPSON RX-8025 found in drivers/rtc/Kconfig

The configuration item CONFIG_RTC_DRV_DS1307:

Help text

If you say yes here you get support for various compatible RTC chips (often with battery backup) connected with I2C. This driver should handle DS1307, DS1337, DS1338, DS1339, DS1340, ST M41T00, EPSON RX-8025 and probably other chips. In some cases the RTC must already have been initialized (by manufacturing or a bootloader).

The first seven registers on these chips hold an RTC, and other registers may add features such as NVRAM, a trickle charger for the RTC/NVRAM backup power, and alarms. NVRAM is visible in sysfs, but other chip features may not be available.

This driver can also be built as a module. If so, the module will be called rtc-ds1307.

Dallas/Maxim DS1307/37/38/39/40, ST M41T00 found in drivers/rtc/Kconfig

The configuration item CONFIG_RTC_DRV_DS1307:

Help text

If you say yes here you get support for various compatible RTC chips (often with battery backup) connected with I2C. This driver should handle DS1307, DS1337, DS1338, DS1339, DS1340, ST M41T00, and probably other chips. In some cases the RTC must already have been initialized (by manufacturing or a bootloader).

The first seven registers on these chips hold an RTC, and other registers may add features such as NVRAM, a trickle charger for the RTC/NVRAM backup power, and alarms. NVRAM is visible in sysfs, but other chip features may not be available.

This driver can also be built as a module. If so, the module will be called rtc-ds1307.

Hardware

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