linux-kernel - Re: Fintek F81865 chip (Wdog support)

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Message-ID: <51FBBF84.2050109@efacec.com>
Date:	Fri, 2 Aug 2013 15:17:40 +0100
From:	BrunoFerreira <bruno.ferreira@...cec.com>
To:	Wim Van Sebroeck <wim@...ana.be>
CC:	Giel van Schijndel <me@...tis.eu>,
	"linux-watchdog@...r.kernel.org" <linux-watchdog@...r.kernel.org>
Subject: Re: Fintek F81865 chip (Wdog support)

Hi All.

Sorry about the delay.
Please find in attach the driver source code with support for this chip.

Kind regards,
Bruno Ferreira

On 05/26/2013 05:44 PM, Wim Van Sebroeck wrote:
> Hi All,
>
>> On Wed, 13 Mar 2013 15:04:38 +0000, BrunoFerreira wrote:
>>> I'm currently working with a new board iEi NOVA-PV-D5251 [1] that
>>> have the Fintek F81865 chip for Super I/O support and I will need to
>>> develop the watchdog driver and another to access to the IO that this
>>> board supports (gpio). I made a search and I see that already exists
>>> a
>>> driver for F71808E chip, I use this driver as an example an I made a
>>> new driver for F81865 chip. My driver is working pretty well, but
>>> I've
>>> a question that I can't find the answer on datasheet of this chip
>>> that
>>> may be Wim or Giel could know.
>>> On both chips, we need to configure a pin that can work as a normal
>>> GPIO (F81865: Set pin 70 the function of WDTRST#/GPIO15 is WDTRST# |
>>> F71808E: Set pin 21 to GPIO23/WDTRST#, then to WDTRST#), this is here
>>> where I get myself confused, this WDTRST will be mapped in any GPIO
>>> output on my board? I mean, if the watchdog is enable I will get any
>>> output pin set to 1 (i.e. the GPIO15, output 5?) and when the
>>> watchdog
>>> goes down this output goes to 0?
>> Sorry, I can't give you a definite answer on that. All Fintek
>> datasheets I've seen are very poorly written. At one point I actually
>> stopped trusting the datasheet enough to go through the hassle of
>> hooking up a scope to the pins of the chip.
>>
>> Hazarding a guess however, I'd say that when the watchdog is enabled
>> you cannot use the WDTRST pin as a GPIO pin.
>>
>>> The other question is to Wim, can you tell me if there is interest in
>>> add this chip support to kernel?
>> This would be a yes, unless there are good reasons not to include it in
>> mainline.
> The answer is indeed yes. Has a patch been created since this message?
>
> Kind regards,
> Wim.
>
>


View attachment "f81865_gpio.c" of type "text/x-csrc" (7952 bytes)