[PATCH v3 0/6] Add NVIDIA VRS PSEQ support

[Shubhi Garg]

This patch series adds support for NVIDIA's Voltage Regulator Specification
(VRS) Power Sequencer (PSEQ) controller. This controller includes a PSEQ
hardware block, that manages power sequencing and voltage regulation for
various components in the system. This controller also provides 32kHz RTC
support with backup battery for system timing.

The series includes:
- Device tree bindings for the VRS PSEQ controller
- MFD driver to handle the core functionality
- RTC driver for the PSEQ's real-time clock functionality
- Device tree nodes for Tegra234 platforms
- Configuration updates to enable the driver
- driver entry in MAINTAINERS

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 driver

Shubhi Garg (6):
  dt-bindings: mfd: add NVIDIA VRS PSEQ
  arm64: tegra: Add device-tree node for NVVRS PSEQ
  mfd: nvvrs: add NVVRS PSEQ MFD driver
  rtc: nvvrs: add NVIDIA VRS PSEQ RTC device driver
  arm64: defconfig: enable NVIDIA VRS PSEQ
  MAINTAINERS: Add NVIDIA VRS PSEQ driver entry

 .../bindings/mfd/nvidia,vrs-pseq.yaml         |  60 +++
 MAINTAINERS                                   |   9 +
 .../arm64/boot/dts/nvidia/tegra234-p3701.dtsi |  11 +
 .../arm64/boot/dts/nvidia/tegra234-p3767.dtsi |  15 +
 arch/arm64/configs/defconfig                  |   2 +
 drivers/mfd/Kconfig                           |  12 +
 drivers/mfd/Makefile                          |   1 +
 drivers/mfd/nvidia-vrs-pseq.c                 | 267 ++++++++++
 drivers/rtc/Kconfig                           |  10 +
 drivers/rtc/Makefile                          |   1 +
 drivers/rtc/rtc-nvidia-vrs-pseq.c             | 457 ++++++++++++++++++
 include/linux/mfd/nvidia-vrs-pseq.h           | 127 +++++
 12 files changed, 972 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/mfd/nvidia,vrs-pseq.yaml
 create mode 100644 drivers/mfd/nvidia-vrs-pseq.c
 create mode 100644 drivers/rtc/rtc-nvidia-vrs-pseq.c
 create mode 100644 include/linux/mfd/nvidia-vrs-pseq.h

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2.43.0