linux-kernel - Re: [PATCH 4/9] PCI: mvebu: add support for reset on GPIO

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Message-ID: <20130813095941.GB30913@pengutronix.de>
Date:	Tue, 13 Aug 2013 11:59:41 +0200
From:	Sascha Hauer <s.hauer@...gutronix.de>
To:	Thomas Petazzoni <thomas.petazzoni@...e-electrons.com>
Cc:	Thierry Reding <thierry.reding@...il.com>,
	Andrew Lunn <andrew@...n.ch>,
	Russell King <linux@....linux.org.uk>,
	Jason Cooper <jason@...edaemon.net>,
	devicetree@...r.kernel.org, linux-pci@...r.kernel.org,
	linux-doc@...r.kernel.org, linux-kernel@...r.kernel.org,
	Bjorn Helgaas <bhelgaas@...gle.com>,
	linux-arm-kernel@...ts.infradead.org,
	Sebastian Hesselbarth <sebastian.hesselbarth@...il.com>
Subject: Re: [PATCH 4/9] PCI: mvebu: add support for reset on GPIO

On Tue, Aug 13, 2013 at 10:30:30AM +0200, Thomas Petazzoni wrote:
> Dear Thierry Reding,
> 
> On Tue, 13 Aug 2013 10:09:56 +0200, Thierry Reding wrote:
> 
> > > +- reset-gpios: optional gpio to PERST#
> > > +- reset-delay-ms: delay in ms to wait after reset de-assertion
> > 
> > I remember some recent discussion about this, and we now have this reset
> > framework, so perhaps it makes more sense to use the reset binding for
> > this? Cc'ing Stephen (as part of the device tree bindings maintainers
> > team) who was involved in that recent reset bindings discussion.
> 
> I also thought about this, but the reset framework seems to be designed
> for "reset controller" IPs, i.e special IPs that are controlling reset
> signals. Looking at Documentation/devicetree/bindings/reset/reset.txt,
> I'm not sure to see how this would apply to GPIO-controlled reset
> signals.

Search for:

[PATCH v10] reset: Add driver for gpio-controlled reset pins

Which aims to be a solution for what you need here.

Sascha

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