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From: Xingyu Chen <xingyu.chen@amlogic.com>
To: Julius Werner <jwerner@chromium.org>
Cc: Evan Benn <evanbenn@chromium.org>,
	Guenter Roeck <linux@roeck-us.net>, Rob Herring <robh@kernel.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>,
	Jianxin Pan <jianxin.pan@amlogic.com>,
	Yonghui Yu <yonghui.yu@amlogic.com>,
	Xingyu Chen <xingyu.chen@amlogic.com>
Subject: Re: [PATCH 1/2] dt-bindings: watchdog: Add arm,smc-wdt watchdog arm,smc-wdt compatible
Date: Sat, 22 Feb 2020 12:01:24 +0800
Message-ID: <1326f594-3cfd-c03d-4f2c-50eeb75724b2@amlogic.com> (raw)
In-Reply-To: <CAODwPW94KX46PzSrf_uuEFPKudXor=26d=g3Qta5veRfxmMDUA@mail.gmail.com>

Hi, Julius

On 2020/2/22 3:41, Julius Werner wrote:
>> Because the ATF does not define standard wdt index, each vendor defines
>> its own index.
>> So I don't think that the current driver[0] can fully cover my usecases.
> I think the best way to solve this would be to put the SMC function ID
> as another field into the device tree, so that multiple vendors could
> share the same driver even if their firmware interface uses a
> different SMC. But they still have to implement the same API for that
> SMC, of course, not sure if the Meson driver is suitable for that (but
> if it is then I think merging those drivers would be a good idea).
The SMC function ID may be solved by the DTS, but the wdt indexs(Eg: 
SMCWD_INFO) are also different
for each vendor. The imx_sc_wdt.c is also use the SMC to operate the 
WDT, but the wdt indexs(Eg: IMX_SIP_TIMER_START_WDOG)
are different from ours. IMO, If the ATF can implement a common hal 
interface and index for watchdog, then writing a
common smc wdt driver will be easier to compatible with all vendors.

Best Regards
>
> .

  parent 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
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 [this message]
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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