Re: [PATCH 09/46] watchdog: sa1100: use platform device registration

[Arnd Bergmann <arnd@arndb.de>]

On Sat, Oct 19, 2019 at 4:07 PM Guenter Roeck <linux@roeck-us.net> wrote:

> > @@ -319,10 +316,13 @@ static struct platform_device *sa11x0_devices[] __initdata = {
> >
> >   static int __init sa1100_init(void)
> >   {
> > +     struct resource wdt_res = DEFINE_RES_MEM(0x90000000, 0x20);
> >       pm_power_off = sa1100_power_off;
> >
> >       regulator_has_full_constraints();
> >
> > +     platform_device_register_simple("sa1100_wdt", -1, &wdt_res, 1);
> > +
> >       return platform_add_devices(sa11x0_devices, ARRAY_SIZE(sa11x0_devices));
>
> Wouldn't it be better to add the watchdog device to sa11x0_devices ?

Generally speaking, platform_device_register_simple() is better than
platform_add_devices(), it does the same thing with fewer source lines
and smaller object code, and it doesn't have the problem of lifetime rules
for statically allocated reference-counted devices.

One day we may want to replace all static platform_device instances with
platform_device_info instead, but right now there are too many of those.

I can change this one to a platform_device for consistency though if you
think it's worth it.

     Arnd