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From: Guenter Roeck <linux@roeck-us.net>
To: Julius Werner <jwerner@chromium.org>
Cc: Rob Herring <robh@kernel.org>, Evan Benn <evanbenn@chromium.org>,
	LKML <linux-kernel@vger.kernel.org>,
	devicetree@vger.kernel.org,
	"David S. Miller" <davem@davemloft.net>,
	Jonathan Cameron <Jonathan.Cameron@huawei.com>,
	Mauro Carvalho Chehab <mchehab+samsung@kernel.org>,
	Wim Van Sebroeck <wim@linux-watchdog.org>,
	Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
	Mark Rutland <mark.rutland@arm.com>,
	linux-watchdog@vger.kernel.org
Subject: Re: [PATCH 1/2] dt-bindings: watchdog: Add arm,smc-wdt watchdog arm,smc-wdt compatible
Date: Wed, 19 Feb 2020 15:20:05 -0800
Message-ID: <20200219232005.GA9737@roeck-us.net> (raw)
In-Reply-To: <CAODwPW8JspiUtyU4CC95w9rbNRyUF-Aeb9TuPm1PzmP6u=y1EA@mail.gmail.com>

On Wed, Feb 19, 2020 at 03:04:54PM -0800, Julius Werner wrote:
> > You are not the first 'watchdog in firmware accessed via an SMC call'.
> > Is there some more detail about what implementation this is? Part of
> > TF-A? Defined by some spec (I can dream)?
> 
> This is just some random implementation written by me because we
> needed one. I would like it to be the new generic implementation, but
> it sounds like people here prefer the naming to be MediaTek specific
> (at least for now). The other SMC watchdog we're aware of is
> imx_sc_wdt but unfortunately that seems to hardcode platform-specific

There is one more pending, for Meson SMC.

https://patchwork.kernel.org/project/linux-watchdog/list/?series=227733

Unfortunately it uses Meson firmware API functions, though it has pretty
much the same functionality since those ultimately end up calling
arm_smccc_smc().

Guenter

> details in the interface (at least in the pretimeout SMC) so we can't
> just expand that. With this driver I tried to directly wrap the kernel
> watchdog interface so it should be platform-agnostic and possible to
> expand this driver to other platforms later if desired. The SMC
> function ID would still always have to be platform-specific,
> unfortunately (but we could pass it in through the device tree), since
> the Arm SMC spec doesn't really leave any room for OS-generic SMCs
> like this.

  reply index

Thread overview: 24+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-02-14  6:26 [PATCH 0/2] Add a watchdog driver that uses ARM Secure Monitor Calls Evan Benn
2020-02-14  6:26 ` [PATCH 1/2] dt-bindings: watchdog: Add arm,smc-wdt watchdog arm,smc-wdt compatible Evan Benn
2020-02-19 22:30   ` Rob Herring
2020-02-19 23:04     ` Julius Werner
2020-02-19 23:20       ` Guenter Roeck [this message]
2020-02-20  6:41         ` Evan Benn
2020-02-20 15:43           ` Guenter Roeck
2020-02-21 15:36           ` Xingyu Chen
2020-02-21 19:41             ` Julius Werner
2020-02-21 20:46               ` Guenter Roeck
2020-02-22  4:01               ` Xingyu Chen
2020-02-24  1:10                 ` Evan Benn
2020-02-25  1:23                 ` Julius Werner
2020-02-25  7:44                   ` Xingyu Chen
2020-03-10  1:00                     ` Evan Benn
     [not found]                       ` <ad28aa47-0490-937f-898f-0e4695ef6ec6@amlogic.com>
2020-03-11 19:24                         ` Julius Werner
2020-03-13 16:13                           ` Xingyu Chen
2020-02-14  6:26 ` [PATCH 2/2] watchdog: Add new arm_smc_wdt watchdog driver Evan Benn
2020-02-14  9:35   ` Enric Balletbo Serra
2020-02-14 14:10   ` Guenter Roeck
2020-02-14 21:32     ` Julius Werner
2020-02-15  1:39       ` Evan Benn
2020-02-20  6:50     ` Evan Benn
2020-02-20 15:52       ` Guenter Roeck

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