Re: [PATCH v5 0/9] Add RZ/G2L POEG support

[Andy Shevchenko <andriy.shevchenko@xxxxxxxxxxxxxxx>]

On Mon, Jan 09, 2023 at 04:00:35PM +0200, Andy Shevchenko wrote:
> On Mon, Jan 09, 2023 at 02:41:24PM +0100, Geert Uytterhoeven wrote:
> > On Mon, Jan 9, 2023 at 2:16 PM Linus Walleij <linus.walleij@xxxxxxxxxx> wrote:
> > > On Tue, Jan 3, 2023 at 10:01 AM Geert Uytterhoeven <geert@xxxxxxxxxxxxxx> wrote:
> > > > > If this should go into sysfs we should probably create something
> > > > > generic, such as a list of stuff to be exported as sysfs switches.
> > > > >
> > > > > It generally also looks really dangerous, which is another reason
> > > > > for keeping it in debugfs. It's the big hammer to hurt yourself with,
> > > > > more or less.
> > > >
> > > > Yes, generic would be nice.  Anyone familiar with other hardware
> > > > that could make use of this?
> > >
> > > Drew was using this for Beagle Bone IIRC, Drew?
> > 
> > Yes, that's what I remember, too.  And I tested it on Koelsch.
> > 
> > But again, that's for debugging purposes.  For non-debugging
> > operation, we need something different.
> 
> I really would like to know the use case when you need to mux pins at run time.
> And the guarantee it won't break users' devices into smoke or killing somebody
> playing with robots.

Btw, I might agree on having something like this in production, but enabling
it should print a BIG warning that the functionality is DANGEROUS. Something
like trace_printk() has.

-- 
With Best Regards,
Andy Shevchenko