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platform/chrome: wilco_ec: Add RTC driver

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This Embedded Controller has an internal RTC that is exposed
as a standard RTC class driver with read/write functionality.

The driver is added to the drivers/rtc/ so that the maintainer of that
directory will be able to comment on this change, as that maintainer is
the expert on this system. In addition, the driver code is called
indirectly after a corresponding device is registered from core.c,
as opposed to core.c registering the driver callbacks directly.

To test:
> hwclock --show --rtc /dev/rtc1
2007-12-31 16:01:20.460959-08:00
> hwclock --systohc --rtc /dev/rtc1
> hwclock --show --rtc /dev/rtc1
2018-11-29 17:08:00.780793-08:00

> hwclock --show --rtc /dev/rtc1
2007-12-31 16:01:20.460959-08:00
> hwclock --systohc --rtc /dev/rtc1
> hwclock --show --rtc /dev/rtc1
2018-11-29 17:08:00.780793-08:00

Signed-off-by: Duncan Laurie <dlaurie@google.com>
Signed-off-by: Nick Crews <ncrews@chromium.org>
Acked-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
[Fix the sparse warning: symbol 'wilco_ec_rtc_read/write' was not declared]
Signed-off-by: Wei Yongjun <weiyongjun1@huawei.com>
Signed-off-by: Enric Balletbo i Serra <enric.balletbo@collabora.com>
This commit is contained in:
Nick Crews
2019-02-08 17:37:19 -07:00
committed by Enric Balletbo i Serra
parent b787bb126c
commit 0d2f2a3da1
5 changed files with 209 additions and 0 deletions
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11
drivers/rtc/Kconfig
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@@ -1814,4 +1814,15 @@ config RTC_DRV_GOLDFISH
Goldfish is a code name for the virtual platform developed by Google
for Android emulation.
config RTC_DRV_WILCO_EC
tristate "Wilco EC RTC"
depends on WILCO_EC
default m
help
If you say yes here, you get read/write support for the Real Time
Clock on the Wilco Embedded Controller (Wilco is a kind of Chromebook)
This can also be built as a module. If so, the module will
be named "rtc_wilco_ec".
endif # RTC_CLASS