linux-kernel - [PATCH v5 0/2] Add a watchdog driver that uses ARM Secure Monitor Calls.

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Message-Id: <20200423044036.234578-1-evanbenn@chromium.org>
Date:   Thu, 23 Apr 2020 14:40:34 +1000
From:   Evan Benn <evanbenn@...omium.org>
To:     LKML <linux-kernel@...r.kernel.org>
Cc:     jwerner@...omium.org, xingyu.chen@...ogic.com,
        Evan Benn <evanbenn@...omium.org>,
        Anson Huang <Anson.Huang@....com>,
        Bjorn Andersson <bjorn.andersson@...aro.org>,
        Catalin Marinas <catalin.marinas@....com>,
        "David S. Miller" <davem@...emloft.net>,
        Geert Uytterhoeven <geert+renesas@...der.be>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Guenter Roeck <linux@...ck-us.net>,
        Leonard Crestez <leonard.crestez@....com>,
        Li Yang <leoyang.li@....com>,
        Marcin Juszkiewicz <marcin.juszkiewicz@...aro.org>,
        Matthias Brugger <matthias.bgg@...il.com>,
        Mauro Carvalho Chehab <mchehab+huawei@...nel.org>,
        Olof Johansson <olof@...om.net>,
        Rob Herring <robh+dt@...nel.org>,
        Rob Herring <robh@...nel.org>, Shawn Guo <shawnguo@...nel.org>,
        Valentin Schneider <valentin.schneider@....com>,
        Will Deacon <will@...nel.org>,
        Wim Van Sebroeck <wim@...ux-watchdog.org>,
        devicetree@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-mediatek@...ts.infradead.org, linux-watchdog@...r.kernel.org
Subject: [PATCH v5 0/2] Add a watchdog driver that uses ARM Secure Monitor Calls.

This is currently supported in firmware deployed on oak, hana and elm mt8173
chromebook devices. The kernel driver is written to be a generic SMC
watchdog driver.

Arm Trusted Firmware upstreaming review:
    https://review.trustedfirmware.org/c/TF-A/trusted-firmware-a/+/3405

Patch to add oak, hana, elm device tree:
    https://lore.kernel.org/linux-arm-kernel/20200110073730.213789-1-hsinyi@chromium.org/
I would like to add the device tree support after the above patch is
accepted.

Changes in v5:
- Change compatible to arm,smc-wdt
- Make timeleft return 0 on error
- Use type punning on smc_func_id to save an alloc
- Change compatible to arm,smc-wdt

Changes in v4:
- Add arm,smc-id property
- Get smc-id from of property
- Return a1 instead of a0 in timeleft

Changes in v3:
- Change name back to arm
- Add optional get_timeleft op
- change name to arm_smc_wdt

Changes in v2:
- Change name arm > mt8173
- use watchdog_stop_on_reboot
- use watchdog_stop_on_unregister
- use devm_watchdog_register_device
- remove smcwd_shutdown, smcwd_remove
- change error codes

Evan Benn (1):
  dt-bindings: watchdog: Add ARM smc wdt for mt8173 watchdog

Julius Werner (1):
  watchdog: Add new arm_smc_wdt watchdog driver

 .../bindings/watchdog/arm-smc-wdt.yaml        |  36 ++++
 MAINTAINERS                                   |   7 +
 arch/arm64/configs/defconfig                  |   1 +
 drivers/watchdog/Kconfig                      |  13 ++
 drivers/watchdog/Makefile                     |   1 +
 drivers/watchdog/arm_smc_wdt.c                | 189 ++++++++++++++++++
 6 files changed, 247 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/watchdog/arm-smc-wdt.yaml
 create mode 100644 drivers/watchdog/arm_smc_wdt.c

-- 
2.26.2.303.gf8c07b1a785-goog