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

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Date:	Tue, 13 Aug 2013 10:30:30 +0200
From:	Thomas Petazzoni <thomas.petazzoni@...e-electrons.com>
To:	Thierry Reding <thierry.reding@...il.com>
Cc:	Sebastian Hesselbarth <sebastian.hesselbarth@...il.com>,
	Russell King <linux@....linux.org.uk>,
	Jason Cooper <jason@...edaemon.net>,
	Andrew Lunn <andrew@...n.ch>,
	Bjorn Helgaas <bhelgaas@...gle.com>,
	devicetree@...r.kernel.org, linux-doc@...r.kernel.org,
	linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
	linux-pci@...r.kernel.org
Subject: Re: [PATCH 4/9] PCI: mvebu: add support for reset on GPIO

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.

Best regards,

Thomas
-- 
Thomas Petazzoni, Free Electrons
Kernel, drivers, real-time and embedded Linux
development, consulting, training and support.
http://free-electrons.com
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