From: Guenter Roeck <linux@roeck-us.net>
To: "Vaittinen, Matti" <Matti.Vaittinen@fi.rohmeurope.com>,
"mazziesaccount@gmail.com" <mazziesaccount@gmail.com>
Cc: "wim@linux-watchdog.org" <wim@linux-watchdog.org>,
"broonie@kernel.org" <broonie@kernel.org>,
"devicetree@vger.kernel.org" <devicetree@vger.kernel.org>,
linux-power <linux-power@fi.rohmeurope.com>,
"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
"lee.jones@linaro.org" <lee.jones@linaro.org>,
"linux-watchdog@vger.kernel.org" <linux-watchdog@vger.kernel.org>,
"lgirdwood@gmail.com" <lgirdwood@gmail.com>,
"robh+dt@kernel.org" <robh+dt@kernel.org>
Subject: Re: [PATCH v1 4/6] wdt: Support wdt on ROHM BD9576MUF and BD9573MUF
Date: Fri, 18 Sep 2020 18:49:59 -0700 [thread overview]
Message-ID: <7c642388-68c9-a0aa-d661-93d13322240d@roeck-us.net> (raw)
In-Reply-To: <3b9d7ba7f59b5c6787c40f86e0258f55fe73e10c.camel@fi.rohmeurope.com>
On 9/17/20 11:06 PM, Vaittinen, Matti wrote:
> Thanks (again) for review Guenter!
>
> On Thu, 2020-09-17 at 22:45 -0700, Guenter Roeck wrote:
>> On 9/17/20 1:03 AM, Matti Vaittinen wrote:
>>> Add Watchdog support for ROHM BD9576MUF and BD9573MUF PMICs which
>>> are
>>> mainly used to power the R-Car series processors. The watchdog is
>>> pinged using a GPIO and enabled using another GPIO. Additionally
>>> watchdog time-out can be configured to HW prior starting the
>>> watchdog.
>>> Watchdog timeout can be configured to detect only delayed ping or
>>> in
>>> a window mode where also too fast pings are detected.
>>>
>>> Signed-off-by: Matti Vaittinen <matti.vaittinen@fi.rohmeurope.com>
>>> ---
>>> drivers/watchdog/Kconfig | 13 ++
>>> drivers/watchdog/Makefile | 1 +
>>> drivers/watchdog/bd9576_wdt.c | 295
>>> ++++++++++++++++++++++++++++++++++
>>> 3 files changed, 309 insertions(+)
>>> create mode 100644 drivers/watchdog/bd9576_wdt.c
>
>>
>>> +
>>> + ret = of_property_read_u32(np,
>>> + "hw_margin_ms", &hw_margin);
>>
>> Line splits are arbitrary. Why is this "hw_margin_ms" and not
>> "rohm,hw_margin_ms" ?
>
> "hw_margin_ms" is an existing binding for specifying the maximum TMO in
> HW (if I understood it correctly). (It is used at least by the generig
> GPIO watchdog) I thought it's better to not invent a new vendor
> specific binding when we have a generic one.
>
> https://elixir.bootlin.com/linux/v5.9-rc2/source/Documentation/devicetree/bindings/watchdog/gpio-wdt.txt
>
>>
>>> + if (ret) {
>>> + if (ret != -EINVAL)
>>> + return ret;
>>> +
>>> + hw_margin = BD957X_WDT_DEFAULT_MARGIN;
>>> + }
>>> +
>>> + ret = of_property_read_u32(np, "rohm,hw-margin-min-ms",
>>> &hw_margin_min);
>>> + if (ret == -EINVAL)
>>> + hw_margin_min = 0;
>>> + else if (ret)
>>> + return ret;
>>
>> Please use a single mechanism to handle -EINVAL after
>> of_property_read_u32().
>
> Sorry Guenter - I am probably a bit slow today but I am unsure if I
> understand the suggestion. Do you mean something like:
>
if (ret) {
>>> + if (ret != -EINVAL)
>>> + return ret;
>>> +
>>> + hw_margin = BD957X_WDT_DEFAULT_MARGIN;
>>> + }
vs.
>>> + if (ret == -EINVAL)
>>> + hw_margin_min = 0;
>>> + else if (ret)
>>> + return ret;
is not very consistent to me.
Guenter
> hw_margin_min = 0;
>
> ret = of_property_read_u32(np, "rohm,hw-margin-min-ms",
> &hw_margin_min);
> if (ret && ret != -EINVAL)
> return ret;
>
> Other than that - all findings are clear to me. I'll craft a new
> version but I'll wait for a while to see if Lee has time to send some
> feedback on MFD so I could get both WDG and MFD fixes to same version
> :)
>
> Best Regards
> --Matti
>
>
> --
> Matti Vaittinen, Linux device drivers
> ROHM Semiconductors, Finland
> SWDC
> Kiviharjunlenkki 1E
> 90220 OULU
> FINLAND
>
> ~~~ "I don't think so," said Rene Descartes. Just then he vanished ~~~
>
> Simon says - in Latin please.
> "non cogito me" dixit Rene Descarte, deinde evanescavit
>
> (Thanks for the translation Simon)
>
next prev parent reply other threads:[~2020-09-19 1:50 UTC|newest]
Thread overview: 16+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-09-17 8:01 [PATCH v1 0/6] Support ROHM BD9576MUF and BD9573MUF PMICs Matti Vaittinen
2020-09-17 8:01 ` [PATCH v1 1/6] dt_bindings: mfd: Add " Matti Vaittinen
2020-09-18 17:28 ` Rob Herring
2020-09-19 11:46 ` Vaittinen, Matti
2020-09-23 14:27 ` Rob Herring
2020-09-24 6:12 ` Vaittinen, Matti
2020-09-24 9:06 ` Vaittinen, Matti
2020-09-17 8:02 ` [PATCH v1 2/6] dt_bindings: regulator: " Matti Vaittinen
2020-09-17 8:02 ` [PATCH v1 3/6] mfd: Support ROHM BD9576MUF and BD9573MUF Matti Vaittinen
2020-09-17 8:03 ` [PATCH v1 4/6] wdt: Support wdt on " Matti Vaittinen
2020-09-18 5:45 ` Guenter Roeck
2020-09-18 6:06 ` Vaittinen, Matti
2020-09-19 1:49 ` Guenter Roeck [this message]
2020-09-17 8:03 ` [PATCH v1 5/6] regulator: Support " Matti Vaittinen
2020-09-17 8:03 ` [PATCH v1 6/6] MAINTAINERS: Add ROHM BD9576MUF and BD9573MUF drivers Matti Vaittinen
2020-09-17 18:58 ` [PATCH v1 0/6] Support ROHM BD9576MUF and BD9573MUF PMICs Mark Brown
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