[PATCH V3 0/7] rtc: ls2x: Add support for the Loongson-2K/LS7A RTC

[Binbin Zhou <zhoubinbin@loongson.cn>]

Hi all:

The initial DT-base ls2x rtc driver was written by Wang Xuerui, He has
released five versions of patchset before, and all related mail records
are shown below if you are interested:

https://lore.kernel.org/all/?q=ls2x-rtc

In this series of patches, based on the code above, I have added the
following support:

1. Add ACPI-related support, as Loongson-3A5000 + LS7A is now ACPI-base
   by default under LoongArch architecture;
2. Add rtc alarm/walarm related functions.

I have tested on Loongson-3A5000LA+LS7A1000/LS7A2000, Loongson-2K1000LA
and Loongson-2K0500.

BTW:
As LS1X does not support DT, we will merge LS2X and LS1X after keguang
has completed DT support for LS1X.

-------
Changes since v2:
- Rebase on the top of rtc-next.
patch(1/7):
 - The new patch.
patch(2/7):
 - Check patchset with "checkpatch.pl --strict";
 - Drop static inline functions which are used only once, such as
   ls2x_rtc_regs_to_time;
 - Remove the suruct ls2x_rtc_regs and regmap_bulk_xxx() is used to read
   and write rtc registers;
 - Clear the RTC wakeup interrupt manually;
 - Enable the RTC in set_time() and check in read_time();
 - device_get_match_data() is used to get ls2x_pm_offset, for LS2k1000
   has the different value;
 - Remove some inexact CONFIG_ACPI;
 - remove()->remove_new().

Changes since v1:
1. Rebased on top of latest loongarch-next;
2. Add interrupt descriptions to the ls2k and ls7a DTS files to avoid
errors when the driver gets the IRQ number, Thanks to Qing Zhang for
testing;
3. Remove some inexact CONFIG_ACPI.

Thanks.

Binbin Zhou (7):
  dt-bindings: rtc: Subdivision of LS2X RTC compatible
  rtc: Add support for the Loongson-2K/LS7A RTC
  LoongArch: Enable LS2X RTC in loongson3_defconfig
  MIPS: Loongson64: DTS: Add RTC support to LS7A
  MIPS: Loongson: Enable LS2X RTC in loongson3_defconfig
  MIPS: Loongson64: DTS: Add RTC support to Loongson-2K
  MIPS: Loongson: Enable LS2X RTC in loongson2k_defconfig

 .../devicetree/bindings/rtc/trivial-rtc.yaml  |   7 +-
 arch/loongarch/configs/loongson3_defconfig    |   1 +
 .../boot/dts/loongson/loongson64-2k1000.dtsi  |   7 +
 arch/mips/boot/dts/loongson/ls7a-pch.dtsi     |   7 +
 arch/mips/configs/loongson2k_defconfig        |   1 +
 arch/mips/configs/loongson3_defconfig         |   1 +
 drivers/rtc/Kconfig                           |  11 +
 drivers/rtc/Makefile                          |   1 +
 drivers/rtc/rtc-ls2x.c                        | 345 ++++++++++++++++++
 9 files changed, 379 insertions(+), 2 deletions(-)
 create mode 100644 drivers/rtc/rtc-ls2x.c

-- 
2.39.1