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[v4,0/6] rtc: ls2x: Add support for the Loongson-2K/LS7A RTC

Message ID 20210628164552.1006079-1-git@xen0n.name
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Series rtc: ls2x: Add support for the Loongson-2K/LS7A RTC | expand

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WANG Xuerui June 28, 2021, 4:45 p.m. UTC 
Here is the 4th revision of the series; the review mail got lost in my
inbox so this is a bit late, sorry for the delay!

The previous revision is tested on Loongson-2K by Jiaxun Yang, and this
revision contains no functional changes so should work on 2K too. I compiled
and tested this revision on a Loongson-3A4000 & LS7A system.

This patch series adds support for the RTC module found on various
Loongson systems with the Loongson-2K SoC or the LS7A bridge chip.
The driver is rewritten from an out-of-tree version to meet mainline
standards. I write kernel code as a hobby, though, so there might still
be overlooked issues. Any suggestions are welcome.

This series is based on next-20210628, but should apply cleanly on rtc-next
too.

v4:
- Rebased on top of next-20210628
- Added Jiaxun's Tested-by tag for Loongson-2K
- Addressed all review comments from v3
  - Rewritten field operations with FIELD_GET/FIELD_PREP
  - Removed all error logs
  - Removed unnecessary spinlocking (RTC core already protects against
    concurrent device file operations)

v3:
- Fixed compile error not discovered after rebase (blame sleep
  deprivation)
- Tested on Loongson-3A4000 (still need testing on Loongson-2K)

v2:
- Rebased on top of latest linux-next
- Updated Huacai's e-mail address to the kernel.org one
- Added collected tags
- Added adaptation for newly upstreamed Loongson-2K platforms

WANG Xuerui (6):
  rtc: ls2x: Add support for the Loongson-2K/LS7A RTC
  dt-bindings: rtc: Add bindings for LS2X RTC
  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  |   2 +
 .../boot/dts/loongson/loongson64-2k1000.dtsi  |   5 +
 arch/mips/boot/dts/loongson/ls7a-pch.dtsi     |   5 +
 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                        | 184 ++++++++++++++++++
 8 files changed, 210 insertions(+)
 create mode 100644 drivers/rtc/rtc-ls2x.c


base-commit: 3579aa488520feeda433ceca23ef4704bf8cd280