[PATCH v2 0/4] add NXP RTC driver support for S32G2/S32G3 SoCs

[Ciprian Costea]

From: Ciprian Marian Costea <ciprianmarian.costea@xxxxxxxxxxx>

This patch series add support for the NXP
RTC hardware module present on S32G2/S32G3 SoCs.

The RTC module is used to enable Suspend to RAM (STR) support.
RTC tracks clock time during system suspend. It represents a
time-based wakeup source for the S32G2/S32G3 SoCs.

RTC is not battery-powered and it is not kept alive during
system reset.

Following is an example of Suspend to RAM trigger on
S32G2/S32G3 SoCs, using userspace tools such as rtcwake:
# rtcwake -s 2 -m mem
# rtcwake: assuming RTC uses UTC ...
# rtcwake: wakeup from "mem" using /dev/rtc0 at Wed Feb  6 06:28:36 2036
#

Changes in V2:
- Removed 'clksel' support from dts bindings.
  Used clock parents support from CCF to better illustrate the
  RTC hardware IP from S32G2/S32G3.
- Removed frequency dividers support from dts bindings.
  Used assigned clock frequencies support from CCF instead.
- Reduced the interval while RTC is voluntarily disabled to a simple
  register write in order to avoid any race condition between a possbile
  rollover and 'suspend' callback execution flow.
- Updated bindings documentation with respect to clocking support.
- Fixed a potential unused variable warning reported
  by kernel test robot.
- Updated to usage of 'devm_rtc_allocate_device' and 'devm_rtc_register_device'
  instead of deprecated 'devm_rtc_device_register'.

Ciprian Marian Costea (4):
  dt-bindings: rtc: add schema for NXP S32G2/S32G3 SoCs
  rtc: s32g: add NXP S32G2/S32G3 SoC support
  arm64: defconfig: add S32G RTC module support
  MAINTAINERS: add NXP S32G RTC driver

 .../devicetree/bindings/rtc/nxp,s32g-rtc.yaml | 102 +++
 MAINTAINERS                                   |   2 +
 arch/arm64/configs/defconfig                  |   1 +
 drivers/rtc/Kconfig                           |  11 +
 drivers/rtc/Makefile                          |   1 +
 drivers/rtc/rtc-s32g.c                        | 778 ++++++++++++++++++
 6 files changed, 895 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/rtc/nxp,s32g-rtc.yaml
 create mode 100644 drivers/rtc/rtc-s32g.c

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2.45.2