linux-kernel - Re: [PATCH v6 3/8] watchdog: hpe-wdt: Introduce HPE GXP Watchdog

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Date:   Thu, 5 May 2022 14:29:05 -0700
From:   Guenter Roeck <linux@...ck-us.net>
To:     "Hawkins, Nick" <nick.hawkins@....com>
Cc:     Arnd Bergmann <arnd@...db.de>,
        "Verdun, Jean-Marie" <verdun@....com>,
        "joel@....id.au" <joel@....id.au>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Wim Van Sebroeck <wim@...ux-watchdog.org>,
        "linux-watchdog@...r.kernel.org" <linux-watchdog@...r.kernel.org>
Subject: Re: [PATCH v6 3/8] watchdog: hpe-wdt: Introduce HPE GXP Watchdog

On Wed, May 04, 2022 at 04:25:59PM +0000, Hawkins, Nick wrote:
> 
> On Tue, May 3, 2022 at 6:53 PM Guenter Roeck <linux@...ck-us.net> wrote:
> 
> > > One bad deed tends to multiply.
> > >
> > > No, I didn't ask to pass a struct resource as platform data.
> > > That would be no different to the current code. Resources can be added 
> > > to a platform device using platform_device_add_resources(), and the 
> > > platform driver can then use platform_get_resource() to use it. This 
> > > would make it independent of a "private" mechanism.
> 
> > Unfortunately there is no resource type for __iomem tokens, only for physical addresses, so you'd end up having to do
> ioremap() of the same address twice to map it into both the timer and the watchdog driver . Not the end of the world of course, but that doesn't seem much better than abusing the device private data.
> 
> Hello Guenter,
> 
> Given Arnd's feedback would you like me to proceed with this change still or do you have another recommendation?
> 

Just leave it as is and add a note explaining why it is done
that way.

Guenter