linux-kernel - Re: [PATCH v7] regulator: fixed: Convert to use GPIO descriptor only

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Date:   Fri, 12 Oct 2018 13:13:43 +0000
From:   Marcel Ziswiler <marcel.ziswiler@...adex.com>
To:     "linux@...linux.org.uk" <linux@...linux.org.uk>
CC:     "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
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Subject: Re: [PATCH v7] regulator: fixed: Convert to use GPIO descriptor only

On Fri, 2018-10-12 at 13:59 +0100, Russell King - ARM Linux wrote:
> On Fri, Oct 12, 2018 at 11:43:13AM +0000, Marcel Ziswiler wrote:
> > I don't think it is that fictitious as it makes it crystal clear
> > that
> > there is something shared with all its pros and cons. E.g. what
> > happens
> > if one of them regulators wants to turn off while the other one
> > still
> > needs power? The regular regulator dependency tree would nicely
> > make
> > this all clear.
> 
> If you're introducing a regulator that doesn't exist in reality
> just to be able to share a GPIO line that is wired to several
> real regulators, then it _is_ ficticious.  You're not describing
> the hardware, you're describing something else to work around the
> shortcomings of the implementation that can't cope with how stuff
> is wired up in the real world.  You're making the DT description
> fit the software implementation, rather than the software
> implementation fit the real world hardware.
> 
> Having a single GPIO that controls multiple separate regulators
> which have entirely separate supplies of their own is very common
> in electronics.

Sure, fine. I will drop it. Thanks!