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References: <20200403052900.258855-1-evanbenn@chromium.org>
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From:   Evan Benn <evanbenn@chromium.org>
Date:   Fri, 3 Apr 2020 17:08:52 +1100
Message-ID: <CAKz_xw1w=uKEV_p94cT8uL-4WN9mRkQE47N=4QdE+_NOFQ-2kg@mail.gmail.com>
Subject: Re: [PATCH v2 0/2] Add a watchdog driver that uses ARM Secure Monitor Calls.
To:     LKML <linux-kernel@vger.kernel.org>
Cc:     Xingyu Chen <xingyu.chen@amlogic.com>,
        Julius Werner <jwerner@chromium.org>,
        Andy Shevchenko <andriy.shevchenko@linux.intel.com>,
        Anson Huang <Anson.Huang@nxp.com>,
        Bjorn Andersson <bjorn.andersson@linaro.org>,
        Catalin Marinas <catalin.marinas@arm.com>,
        "David S. Miller" <davem@davemloft.net>,
        Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
        Guenter Roeck <linux@roeck-us.net>,
        Jonathan Cameron <Jonathan.Cameron@huawei.com>,
        Leonard Crestez <leonard.crestez@nxp.com>,
        Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org>,
        Marcin Juszkiewicz <marcin.juszkiewicz@linaro.org>,
        Mark Rutland <mark.rutland@arm.com>,
        Matthias Brugger <matthias.bgg@gmail.com>,
        Mauro Carvalho Chehab <mchehab+huawei@kernel.org>,
        Olof Johansson <olof@lixom.net>,
        Rob Herring <robh+dt@kernel.org>,
        Rob Herring <robh@kernel.org>, Shawn Guo <shawnguo@kernel.org>,
        Valentin Schneider <valentin.schneider@arm.com>,
        Vinod Koul <vkoul@kernel.org>, Will Deacon <will@kernel.org>,
        Wim Van Sebroeck <wim@linux-watchdog.org>,
        devicetree@vger.kernel.org,
        "moderated list:ARM/FREESCALE IMX / MXC ARM ARCHITECTURE" 
        <linux-arm-kernel@lists.infradead.org>,
        "moderated list:ARM/Mediatek SoC support" 
        <linux-mediatek@lists.infradead.org>,
        LINUX-WATCHDOG <linux-watchdog@vger.kernel.org>
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Apologies I forgot to add this note to my cover letter.

Xingyu do you mind seeing if you can modify your ATF firmware to match
this driver?
We can add a compatible or make other changes to suit you.

Thanks


On Fri, Apr 3, 2020 at 4:29 PM Evan Benn <evanbenn@chromium.org> wrote:
>
> 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 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_smd_wdt watchdog driver
>
>  .../bindings/watchdog/arm-smc-wdt.yaml        |  30 +++
>  MAINTAINERS                                   |   7 +
>  arch/arm64/configs/defconfig                  |   1 +
>  drivers/watchdog/Kconfig                      |  13 ++
>  drivers/watchdog/Makefile                     |   1 +
>  drivers/watchdog/arm_smc_wdt.c                | 181 ++++++++++++++++++
>  6 files changed, 233 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/watchdog/arm-smc-wdt.yaml
>  create mode 100644 drivers/watchdog/arm_smc_wdt.c
>
> --
> 2.26.0.292.g33ef6b2f38-goog
>