linux-kernel - Re: [PATCH 0/5] watchdog: eiois200_wdt: Add EIO-IS200 Watchdog Driver

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Date:   Fri, 6 Oct 2023 17:27:48 +0800
From:   Wenkai <advantech.susiteam@...il.com>
To:     Guenter Roeck <linux@...ck-us.net>
Cc:     wenkai.chung@...antech.com.tw, Susi.Driver@...antech.com,
        Wim Van Sebroeck <wim@...ux-watchdog.org>,
        linux-kernel@...r.kernel.org, linux-watchdog@...r.kernel.org
Subject: Re: [PATCH 0/5] watchdog: eiois200_wdt: Add EIO-IS200 Watchdog Driver

Guenter Roeck 於 10/6/2023 11:02 AM 寫道:
> On Thu, Oct 05, 2023 at 04:51:18PM +0800, advantech.susiteam@...il.com wrote:
>> From: Wenkai <advantech.susiteam@...il.com>
>>
>> This patch series aims to add support for the Advantech EIO-IS200
>> Embedded Controller's watchdog timer to the Linux kernel. The EIO-IS200
>> is a widely used embedded controller, and this series introduces a
>> native driver for its watchdog timer functionality within the Linux
>> ecosystem.
>>
> I am not going to review this patch series. This is just ne watchdog driver.
> One patch is sufficient.
>
> Guenter
Hi Guenter,

Advantech's EIO-IS200 watchdog supports 5 output pins: RESET, Power
Button, SCI, IRQ, and GPIO. The most traditional scenario is that the
Pretimeout triggers IRQ, and the timeout triggers RESET.

However, unfortunately, for industrial usages, there are various use
cases, which require certain mechanisms and logic to manage which signal
is output when Pretimeout and timeout expire. I am concerned that
consolidating all these features into a single patch for upstream may
lead to confusion and make the source code less readable and
understandable.

Therefore, I have divided the implementation into 5 separate patches,
aiming to make the code more comprehensible and acceptable. If it's
acceptable to you, I am more than willing to provide a single patch as
per your preference.

I would also like to note that this watchdog driver is part of the
EIO-IS200 MFD (Multi-Function Device) driver family. It serves as one
of the child-drivers of the drivers/mfd/eiois200_core core driver. It's
important to mention that without the presence of
drivers/mfd/eiois200_core, this child-driver eiois200_wdt cannot be
compiled or used.

Should we wait until the core driver (drivers/mfd/eiois200_core) is
successfully incorporated before upstreaming the watchdog child-driver,
or would you prefer to proceed with these patches independently?

Best regards,
Wenkai