[PATCH V5 0/5] Add rtc driver for the Loongson family chips

[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;
3. Merge LS1X rtc and LS2X rtc into a unified rtc-loongson driver.

I have tested on Loongson-3A5000LA+LS7A1000/LS7A2000, Loongson-2K1000LA,
Loongson-2K0500 and Loongson-2K2000(ACPI/DT).

Thanks to everyone for reviewing and testing the code.

-------
v5:
patch(1/5)
  - The reason why ls2x can be removed directly is explained in the
    commit message;
  - Use fallback compatible;
    Thanks to all who participated in the fallback compatible discussion.
patch(3/5)
  - Since ls1b and ls1c have different register definitions, we'd better
    distinguish them with different
    configurations(ls1b_rtc_config/ls1c_rtc_config);
  - Due to the use of fallback compatible, the redundant compatible is
    removed. We can see the full list of supported chips in dt-binding..

v4:
https://lore.kernel.org/linux-rtc/cover.1684983279.git.zhoubinbin@loongson.cn/

- Rebase on the top of rtc-next;
- Drop defconfig-related patches;
patch(1/5)
  - New patch, Loongson RTC bindings have been rewritten and we have
    dropped the wildcard (ls2x) in compatible.
    Thanks to Krzysztof for your comments;
patch(2/5)
  - New patch, drop the ls1x rtc driver;
patch(3/5)
  - Clear RTC_FEATURE_UPDATE_INTERRUPT bit, for the rtc does not support
    UIE;
  - Add LS2K2000 support(DT/ACPI);
  - Merge ls1x support and name the driver rtc-loongson;
    Thanks to Jiaxun for his comments and Keguang for his assistance in
testing.

v3:
https://lore.kernel.org/linux-rtc/cover.1681370153.git.zhoubinbin@loongson.cn/

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.

v2:
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 (5):
  dt-bindings: rtc: Remove the LS2X from the trivial RTCs
  rtc: Remove the Loongson-1 RTC driver
  rtc: Add rtc driver for the Loongson family chips
  MIPS: Loongson64: DTS: Add RTC support to LS7A PCH
  MIPS: Loongson64: DTS: Add RTC support to Loongson-2K1000

 .../devicetree/bindings/rtc/loongson,rtc.yaml |  57 +++
 .../devicetree/bindings/rtc/trivial-rtc.yaml  |   2 -
 .../boot/dts/loongson/loongson64-2k1000.dtsi  |   7 +
 arch/mips/boot/dts/loongson/ls7a-pch.dtsi     |   7 +
 drivers/rtc/Kconfig                           |  23 +-
 drivers/rtc/Makefile                          |   2 +-
 drivers/rtc/rtc-loongson.c                    | 397 ++++++++++++++++++
 drivers/rtc/rtc-ls1x.c                        | 192 ---------
 8 files changed, 482 insertions(+), 205 deletions(-)
 create mode 100644 Documentation/devicetree/bindings/rtc/loongson,rtc.yaml
 create mode 100644 drivers/rtc/rtc-loongson.c
 delete mode 100644 drivers/rtc/rtc-ls1x.c

-- 
2.39.1