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| author | Bruno Thomsen <bruno.thomsen@gmail.com> | 2019-08-22 15:19:35 +0200 |
|---|---|---|
| committer | Alexandre Belloni <alexandre.belloni@bootlin.com> | 2019-08-27 18:24:15 +0200 |
| commit | 0e735eaae1650a2e26835cc776f496e06a87be9f (patch) | |
| tree | d077e7192c7f1cbbdaafe3616875f31a2b273293 /drivers/rtc/Kconfig | |
| parent | 7f43020e3bdb63d65661ed377682702f8b34d3ea (diff) | |
| download | linux-stable-0e735eaae1650a2e26835cc776f496e06a87be9f.tar.gz linux-stable-0e735eaae1650a2e26835cc776f496e06a87be9f.tar.bz2 linux-stable-0e735eaae1650a2e26835cc776f496e06a87be9f.zip | |
rtc: pcf2127: add watchdog feature support
Add partial support for the watchdog functionality of
both PCF2127 and PCF2129 chips.
The programmable watchdog timer is currently using a fixed
clock source of 1Hz. This result in a selectable range of
1-255 seconds, which covers most embedded Linux use-cases.
Clock sources of 4096Hz, 64Hz and 1/60Hz is mostly useful
in MCU use-cases.
Countdown timer not available when using watchdog feature.
Signed-off-by: Bruno Thomsen <bruno.thomsen@gmail.com>
Acked-by: Guenter Roeck <linux@roeck-us.net>
Link: https://lore.kernel.org/r/20190822131936.18772-4-bruno.thomsen@gmail.com
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
Diffstat (limited to 'drivers/rtc/Kconfig')
| -rw-r--r-- | drivers/rtc/Kconfig | 7 |
1 files changed, 6 insertions, 1 deletions
diff --git a/drivers/rtc/Kconfig b/drivers/rtc/Kconfig index 63bd72a96210..758f7a417470 100644 --- a/drivers/rtc/Kconfig +++ b/drivers/rtc/Kconfig @@ -888,7 +888,12 @@ config RTC_DRV_PCF2127 depends on RTC_I2C_AND_SPI help If you say yes here you get support for the NXP PCF2127/29 RTC - chips. + chips with integrated quartz crystal for industrial applications. + Both chips also have watchdog timer and tamper switch detection + features. + + PCF2127 has an additional feature of 512 bytes battery backed + memory that's accessible using nvmem interface. This driver can also be built as a module. If so, the module will be called rtc-pcf2127. |