[PATCH v5 0/4] Add NVIDIA VRS RTC support

[Shubhi Garg]

This patch series adds support for NVIDIA's Voltage Regulator Specification
(VRS) RTC device. It provides following features:
- read/set system time
- 32kHz clock support with backup battery input to retain system time
  across boot
- alarm functionality to wake system from suspend and shutdown state

The series includes:
- Device tree bindings for the VRS RTC
- VRS device tree nodes for NVIDIA platforms
- VRS RTC device driver
- Configuration updates to enable the driver

Changes in v5:
- moved device tree bindings from mfd to rtc
- changed dtb node name to rtc at 3c
- removed VRS MFD driver
- moved VRS common functions to RTC driver
- removed unused register definitions from header
- changed driver compatible to "nvidia,vrs10-rtc"

Changes in v4:
- fixed device tree node name to "pmic at 3c" in dtb aliases

Changes in v3:
- fixed device tree node name to generic "pmic at 3c"
- fixed indentation in dt-bindings
- added rate limiting to interrupt clearing debug logs
- removed unnecessary braces in if blocks
- changed dependency from I2C=y to I2C in mfd Kconfig
- fixed return value in RTC driver function calls
- fixed sizeof(*variable) inside rtc driver devm_kzalloc
- switch to devm_device_init_wakeup() for automatic cleanup

Changes in v2:
- fixed, copyrights, definitions and dtb node in dt-bindings
- removed unnecessary logs from MFD and RTC driver
- fixed RTC allocation and registration APIs
- removed unnecessary functions in RTC driver
- used rtc_lock/unlock in RTC irq handler
- added alias to assign VRS RTC as RTC0
- added driver entry in MAINTAINERS
- few other miinor changes done in drivers

Shubhi Garg (4):
  dt-bindings: rtc: Document NVIDIA VRS RTC
  arm64: tegra: Add device-tree node for NVVRS RTC
  rtc: nvvrs: add NVIDIA VRS RTC device driver
  arm64: defconfig: enable NVIDIA VRS PSEQ RTC

 .../bindings/rtc/nvidia,vrs10-rtc.yaml        |  57 ++
 MAINTAINERS                                   |   8 +
 .../arm64/boot/dts/nvidia/tegra234-p3701.dtsi |  11 +
 .../arm64/boot/dts/nvidia/tegra234-p3767.dtsi |  15 +
 arch/arm64/configs/defconfig                  |   1 +
 drivers/rtc/Kconfig                           |   9 +
 drivers/rtc/Makefile                          |   1 +
 drivers/rtc/rtc-nvidia-vrs10.c                | 508 ++++++++++++++++++
 include/linux/rtc/rtc-nvidia-vrs10.h          |  78 +++
 9 files changed, 688 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/rtc/nvidia,vrs10-rtc.yaml
 create mode 100644 drivers/rtc/rtc-nvidia-vrs10.c
 create mode 100644 include/linux/rtc/rtc-nvidia-vrs10.h

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2.43.0