linux-kernel - [PATCH v7 0/2] ARM: r9a06g032: add support for the watchdogs

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Date:   Wed, 27 Apr 2022 15:55:29 +0200
From:   Jean-Jacques Hiblot <jjhiblot@...phandler.com>
To:     <linux@...ck-us.net>, <wim@...ux-watchdog.org>,
        <geert+renesas@...der.be>, <tzungbi@...nel.org>,
        <linux-watchdog@...r.kernel.org>
CC:     <linux-renesas-soc@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>,
        Jean-Jacques Hiblot <jjhiblot@...phandler.com>
Subject: [PATCH v7 0/2] ARM: r9a06g032: add support for the watchdogs

Hi all,

This series adds support for the watchdog timers of the RZ/N1.
The watchdog driver (rzn1-wdt.c) is derived from the driver available at
https://github.com/renesas-rz/rzn1_linux.git with a few modifications

In order to be able to reset the board when a watchdog timer expires,
the RSTEN register must be configured. it is the responsability of the
bootloader to set those bits (or not, depending on the chosen policy).

If the watchdog reset source is not enabled, an interrupt is triggered
when the watchdog expires. The interrupt handler will trigger an
emergency restart.

Changes v6 -> v7:
* drop error message indicating an error of devm_add_action_or_reset() 
* store the clock rate in kHz

Changes v5 -> v6:
* check the value returned by watchdog_init_timeout()
* fix checkpatch warning about the LICENSE identifier ("GPL v2" -> "GPL")

Changes v4 -> v5:
* use watchdog_get/set_drvdata() instead of container_of()
* In probe(), initialize each member of struct watchdog_device separately
  instead of copying the whole struct from a template.

Changes v3 -> v4:
 * dts: removed the patches that modify the device tree (already taken in
   the renesas dt tree)
 * driver: Call emergency_restart() in the interrupt handler.

Changes v2 -> v3:
* dts: changed compatible strings to include "renesas,r9a06g032-wdt" and
  "renesas,rzn1-wdt".
* driver: removed the SOC-specific "renesas,r9a06g032-wdt".
* removed all the changes in the clock driver: the watchdog reset source
  are not disabled anymore when the machine is halted.
* fixed the clock rate type in the computations.
* removed unnecessary printout and call to clk_disable_unprepare() in the
  driver probe().

Changes v1 -> v2:
* Modified the clock driver to not enable the watchdog reset sources.
  On other renesas platforms, those bits are by the bootloader. The
  watchdog reset sources are still disabled when the platform is halted
  to prevent a watchdog reset.
* Added a SOC-specific compatible "renesas,r9a06g032-wdt"
* reordered the dts/i entries
* default timeout is 60 seconds
* reworked the probe function of the wdt driver to better error cases
* removed the set_timeout() and use a fixed period computed in probe().
  This removes the confusion and makes it clear that the period defined
  by the user space in indeed handled by the watchdog core

Jean-Jacques Hiblot (1):
  dt-bindings: watchdog: renesas,wdt: Add support for RZ/N1

Phil Edworthy (1):
  watchdog: Add Renesas RZ/N1 Watchdog driver

 .../bindings/watchdog/renesas,wdt.yaml        |   6 +
 drivers/watchdog/Kconfig                      |   8 +
 drivers/watchdog/Makefile                     |   1 +
 drivers/watchdog/rzn1_wdt.c                   | 203 ++++++++++++++++++
 4 files changed, 218 insertions(+)
 create mode 100644 drivers/watchdog/rzn1_wdt.c

-- 
2.25.1