linux-kernel - [PATCH v3 0/3] Add RTC for MStar SoCs

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Message-Id: <20210819170301.10520-1-romain.perier@gmail.com>
Date:   Thu, 19 Aug 2021 19:02:58 +0200
From:   Romain Perier <romain.perier@...il.com>
To:     Alessandro Zummo <a.zummo@...ertech.it>,
        Alexandre Belloni <alexandre.belloni@...tlin.com>,
        Daniel Palmer <daniel@...f.com>,
        Rob Herring <robh+dt@...nel.org>
Cc:     linux-rtc@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org
Subject: [PATCH v3 0/3] Add RTC for MStar SoCs

This patches series adds a new driver for the RTC found in the Mstar
MSC313e SoCs and newer. It adds a basic rtc driver, the corresponding
devicetree bindings and its documentation.

The rtctest (from selftests) has been passed on this driver, with the
following output:
$ rtctest 
TAP version 13
1..7
# Starting 7 tests from 2 test cases.
#  RUN           rtc.date_read ...
# rtctest.c:47:date_read:Current RTC date/time is 01/01/1970 00:02:03.
#            OK  rtc.date_read
ok 1 rtc.date_read
#  RUN           rtc.uie_read ...
#            OK  rtc.uie_read
ok 2 rtc.uie_read
#  RUN           rtc.uie_select ...
#            OK  rtc.uie_select
ok 3 rtc.uie_select
#  RUN           rtc.alarm_alm_set ...
# rtctest.c:136:alarm_alm_set:Alarm time now set to 00:02:12.
# rtctest.c:156:alarm_alm_set:data: 1a0
#            OK  rtc.alarm_alm_set
ok 4 rtc.alarm_alm_set
#  RUN           rtc.alarm_wkalm_set ...
# rtctest.c:192:alarm_wkalm_set:Alarm time now set to 01/01/1970 00:02:15.
#            OK  rtc.alarm_wkalm_set
ok 5 rtc.alarm_wkalm_set
#  RUN           rtc.alarm_alm_set_minute ...
# rtctest.c:238:alarm_alm_set_minute:Alarm time now set to 00:03:00.
# rtctest.c:258:alarm_alm_set_minute:data: 1a0
#            OK  rtc.alarm_alm_set_minute
ok 6 [  180.545015] random: fast init done
rtc.alarm_alm_set_minute
#  RUN           rtc.alarm_wkalm_set_minute ...
# rtctest.c:294:alarm_wkalm_set_minute:Alarm time now set to 01/01/1970 00:04:00.
#            OK  rtc.alarm_wkalm_set_minute
ok 7 rtc.alarm_wkalm_set_minute
# PASSED: 7 / 7 tests passed.
# Totals: pass:7 fail:0 xfail:0 xpass:0 skip:0 error:0

Changes since v2:
- Added dual-license header to the dt-bindings documentation
- Reordered dts entries, so the rtc device_node is before the watchdog
  device_node (because it has a lower address)
- Updated rtc range_max to U32_MAX
- Leave range_min to 0 (default value when it is not set at all)
- Fixed the CNT_EN_BIT logic, so .read_time will only read the time when
  the RTC has been previously set and has a valid state (which is not
  the case after a POR).

Changes since v1:
- Fixed the DT bindings documentation and fixed dt_binding_check (an
  include was missing)
- Added || COMPILE_TEST to kconfig
- Removed rtc_valid_tm from msc313_rtc_read_time()
- Removed the last write of the msc313_rtc_set_time() function (not
  required) and improved comments
- Replaced the relaxed io by normal io in msc313_rtc_interrupt()
- Added checks to be sure that the alarm fired in msc313_rtc_interrupt()
- Removed msc313_rtc_remove() (replaced by devm_add_action_or_reset)
- Removed unnecessary software reset of the IP in the probe function
  (the soft reset is never executed, it is a mistake from the initial
  refactoring)
- Switched to devm_rtc_allocate_device() and devm_rtc_register_device(),
  and dropped the error message related to the rtc device allocation
- Added an RTC range by setting .range_min and .range_max
- Added the "start-year" property to the DT bindings documentation


Daniel Palmer (1):
  rtc: Add support for the MSTAR MSC313 RTC

Romain Perier (2):
  dt-bindings: rtc: Add Mstar MSC313e RTC devicetree bindings
    documentation
  ARM: dts: mstar: Add rtc device node

 .../bindings/rtc/mstar,msc313-rtc.yaml        |  49 ++++
 MAINTAINERS                                   |   1 +
 arch/arm/boot/dts/mstar-v7.dtsi               |   8 +
 drivers/rtc/Kconfig                           |  10 +
 drivers/rtc/Makefile                          |   1 +
 drivers/rtc/rtc-msc313.c                      | 258 ++++++++++++++++++
 6 files changed, 327 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/rtc/mstar,msc313-rtc.yaml
 create mode 100644 drivers/rtc/rtc-msc313.c

-- 
2.30.2