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rtc: support for the Amlogic Meson RTC

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Add support for the RTC block on the 32-bit Amlogic Meson6, Meson8,
Meson8b and Meson8m2 SoCs.

The RTC is split in to two parts, which are both managed by this driver:
- the AHB front end
- and a simple serial connection to the actual registers

The RTC_COUNTER register which holds the time is 32-bits wide.

There are four 32-bit wide (in total: 16 bytes) "regmem" registers which
are exposed using nvmem. On Amlogic's 3.10 kernel this is used to store
data which needs to survive a suspend / resume cycle.

Signed-off-by: Ben Dooks <ben.dooks@codethink.co.uk>
[resurrected Ben's patches after 2 years]
Signed-off-by: Martin Blumenstingl <martin.blumenstingl@googlemail.com>
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
This commit is contained in:
Martin Blumenstingl
2019-02-09 01:18:13 +01:00
committed by Alexandre Belloni
parent 1366e010ad
commit d8fe6009aa
3 changed files with 422 additions and 0 deletions
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11
drivers/rtc/Kconfig
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@@ -1294,6 +1294,17 @@ config RTC_DRV_IMXDI
This driver can also be built as a module, if so, the module
will be called "rtc-imxdi".
config RTC_DRV_MESON
tristate "Amlogic Meson RTC"
depends on (ARM && ARCH_MESON) || COMPILE_TEST
select REGMAP_MMIO
help
Support for the RTC block on the Amlogic Meson6, Meson8, Meson8b
and Meson8m2 SoCs.
This driver can also be built as a module, if so, the module
will be called "rtc-meson".
config RTC_DRV_OMAP
tristate "TI OMAP Real Time Clock"
depends on ARCH_OMAP || ARCH_DAVINCI || COMPILE_TEST