linux-kernel - [PATCH v5 0/2] rtc: microchip: Add driver for PolarFire SoC

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Message-ID: <20220601123320.2861043-1-conor.dooley@microchip.com>
Date:   Wed, 1 Jun 2022 13:33:19 +0100
From:   Conor Dooley <conor.dooley@...rochip.com>
To:     <a.zummo@...ertech.it>, <alexandre.belloni@...tlin.com>
CC:     <daire.mcnamara@...rochip.com>, <lewis.hanly@...rochip.com>,
        <conor.dooley@...rochip.com>, <linux-kernel@...r.kernel.org>,
        <linux-rtc@...r.kernel.org>, <linux-riscv@...ts.infradead.org>
Subject: [PATCH v5 0/2] rtc: microchip: Add driver for PolarFire SoC

Hey all,
This is technically a v5 of [0], although a fair bit of time has
passed since then. In the meantime I upstreamed the dt-binding, which
was in the v1, and this patch depends on the fixes to the dt-binding
and device tree etc which landed in v5.18-rc5.

The driver is quite substantially rewritten from the v1, as you wanted
it to be switched to "binary" rather than calendar mode - so hopefully I
have satisfied your concerns with the original driver. Specifically you
had an significant issue with the counter being reset on startup & that
is no longer the case.

Thanks,
Conor.

Changes since v4:
- replace duplicate define of BIT(6) with the missing BIT(7) define
- remove duplicate read of the mode register in mpfs_rtc_readalarm()
- simplify if (mode & MODE_WAKE_EN) to an assignment
- replace (potentially) infinite wait with read_poll_timeout

Changes since v3:
- invert read order of datetime registers so that they are properly
  aligned. reads of the upper register are aligned to the last read
  of the lower register
- move wakeup_irq out of mpfs_rtc_dev & into probe
- removed range_min since it is not set & implicity zero anyway
- rewrote the remove function to not call mpfs_rtc_alarm_irq_enable(,0)

Changes from v2:
- move prescaler out of mpfs_rtc_dev & into probe

Changes from v1:
- remove duplicate and unused defines
- remove oneline mpfs_rtc_set_prescaler function
- dont unconditionally turn off the rtc in the init function
- dont reset the rtc when init is run.
- dont disable the alarm when we boot
- use binary, not calendar mode
- delete mpfs_rtc_init & set prescale in probe
- use dev_pm_set_wake_irq rather than writing suspend/resume functions
- delete calendar mode only register defines
- since using binary mode, set range min to zero
- set range max to max alarm value (is this acceptable?)
- added a MAINTAINERS entry: when v1 was submitted there was nothing to
  add to, but there is now.

[0] https://lore.kernel.org/linux-rtc/20210512111133.1650740-1-daire.mcnamara@microchip.com/


Conor Dooley (2):
  rtc: Add driver for Microchip PolarFire SoC
  MAINTAINERS: add PolarFire SoC's RTC

 MAINTAINERS            |   1 +
 drivers/rtc/Kconfig    |  10 ++
 drivers/rtc/Makefile   |   1 +
 drivers/rtc/rtc-mpfs.c | 326 +++++++++++++++++++++++++++++++++++++++++
 4 files changed, 338 insertions(+)
 create mode 100644 drivers/rtc/rtc-mpfs.c


base-commit: c5eb0a61238dd6faf37f58c9ce61c9980aaffd7a
-- 
2.36.1