[PATCH] Watchdog: Adding support for Watchdog found with ARM CortexA9

[Shilimkar, Santosh]

> -----Original Message-----
> From: linux-arm-kernel-bounces at lists.infradead.org [mailto:linux-arm-kernel-
> bounces at lists.infradead.org] On Behalf Of Viresh KUMAR
> Sent: Wednesday, May 19, 2010 9:33 AM
> To: George G. Davis; srinidhi kasagar; alan at lxorguk.ukuu.org.uk
> Cc: armando.visconti at st.com; shiraz.hashim at st.com; Jassi Brar; linus.walleij at stericsson.com; linux-
> arm-kernel at lists.infradead.org
> Subject: Re: [PATCH] Watchdog: Adding support for Watchdog found with ARM CortexA9
> 
> On 5/18/2010 6:50 PM, George G. Davis wrote:
> > Hi,
> >
> > On Tue, May 18, 2010 at 02:55:21PM +0530, srinidhi kasagar wrote:
> >> I do not understand why a new driver is required while having similar one
> >> for MPCore watchdog.
> >> Please have a look at drivers/watchdog/mpcore_wdt.c
> >
> > The same thought occurred to me.  Based on a cursory glance at the Cortex-A9
> > MPCore and ARM11 MPCore, the per-CPU watchdogs do appear to be the same
> > and could use the same driver.
> >
> > Any reason for creating a new driver rather than reusing the ARM11
> > MPCore driver?
> >
> 
> Sorry Guys!!! Earlier I tried to find existing driver, but couldn't found one.
> So sent a new one.
> 
> I went through this driver and found some shortcomings in it:
>  - It looks it is not used by anyone now, as it required
>    asm/hardware/arm_twd.h and it was removed in v2.6.31.
>    So it would never compile.
>  - It doesn't support clock framework, and works on fixed rate.
>  - It works on fixed prescale value (256).
>  - It doesn't support WDIOC_GETBOOTSTATUS.
> 
> So, please suggest how to proceed as my patch contains all these features.
> 
Can the existing driver be upgraded with all above missing pieces?

Regards,
Santosh