[PATCH 2/2] powerpc/watchdog: allow the e500 watchdog driver to be compiled as a module

Josh Boyer jwboyer at linux.vnet.ibm.com
Tue Sep 21 05:30:16 EST 2010

On Mon, Sep 20, 2010 at 10:51:37AM -0500, Timur Tabi wrote:
>On Fri, Sep 17, 2010 at 7:37 PM, Josh Boyer <jwboyer at gmail.com> wrote:
>>>  config BOOKE_WDT
>>> -       bool "PowerPC Book-E Watchdog Timer"
>>> +       tristate "PowerPC Book-E Watchdog Timer"
>>>        depends on BOOKE || 4xx
>>>        ---help---
>>> +         Watchdog driver for PowerPC e500 chips, such as the Freescale
>>> +         MPC85xx SOCs.
>>> +
>> Again, used for more than e500.  That || 4xx in the depends statement
>> right above your addition isn't there for fun :).
>Does this mean that this comment which is already in the driver is
>wrong?  It alludes that "Book-E" is synonymous with "e500".
>/* If the kernel parameter wdt=1, the watchdog will be enabled at boot.
> * Also, the wdt_period sets the watchdog timer period timeout.
> * For E500 cpus the wdt_period sets which bit changing from 0->1 will
> * trigger a watchog timeout. This watchdog timeout will occur 3 times, the
> * first time nothing will happen, the second time a watchdog exception will
> * occur, and the final time the board will reset.
> */

I guess I don't see what you mean.  It talks about e500 but it doesn't
say "Book-E" anywhere in that comment.  (Though I'm pretty sure that
comment does apply to 4xx.)

>#define WDT_PERIOD_DEFAULT 38	/* Ex. wdt_period=28 bus=333Mhz,reset=~40sec */
>#define WDT_PERIOD_DEFAULT 3	/* Refer to the PPC40x and PPC4xx manuals */
>#endif				/* for timing information */

And this bit is marked as "FSL_BOOKE" vs. 40x and 44x.


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