From: Sebastian Hesselbarth <sebastian.hesselbarth@gmail.com>
To: Thierry Reding <thierry.reding@gmail.com>
Cc: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>,
Russell King <linux@arm.linux.org.uk>,
Jason Cooper <jason@lakedaemon.net>, Andrew Lunn <andrew@lunn.ch>,
Bjorn Helgaas <bhelgaas@google.com>,
devicetree@vger.kernel.org, linux-doc@vger.kernel.org,
linux-kernel@vger.kernel.org,
linux-arm-kernel@lists.infradead.org, linux-pci@vger.kernel.org,
Sascha Hauer <s.hauer@pengutronix.de>
Subject: Re: [PATCH 4/9] PCI: mvebu: add support for reset on GPIO
Date: Tue, 13 Aug 2013 12:40:29 +0200 [thread overview]
Message-ID: <520A0D1D.4050609@gmail.com> (raw)
In-Reply-To: <20130813100348.GA28762@ulmo>
On 08/13/13 12:03, Thierry Reding wrote:
> 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.
>
> See:
>
> http://www.mail-archive.com/devicetree-discuss@lists.ozlabs.org/msg36900.html
>
> which seems to have carried over to this at some point:
>
> http://www.spinics.net/lists/devicetree/msg00521.html
>
> Some of the messages in between I can't find in any archive, sorry.
Thierry, Sascha,
thanks for the input. Flipping through the above discussion, I guess
using "reset-gpios" and "reset-delay-us" should be fine?
I can also remove the delay property for now, as I cannot find a final
conclusion about the configurable delay.
In the driver, I will stick to bare gpiolib and wait for gpio-reset
driver to become available. Currently, we don't have sophisticated
reset handling in pci-mvebu anyway.
Sebastian
next prev parent reply other threads:[~2013-08-13 10:40 UTC|newest]
Thread overview: 23+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-08-12 18:46 [PATCH 0/9] ARM: dove: DT PCIe support Sebastian Hesselbarth
2013-08-12 18:46 ` [PATCH 1/9] PCI: mvebu: move clock enable before register access Sebastian Hesselbarth
2013-08-13 7:11 ` Thomas Petazzoni
2013-08-13 9:22 ` Sebastian Hesselbarth
2013-08-13 7:58 ` Thierry Reding
2013-08-12 18:46 ` [PATCH 2/9] PCI: mvebu: increment nports only for registered ports Sebastian Hesselbarth
2013-08-13 7:15 ` Thomas Petazzoni
2013-08-13 9:23 ` Sebastian Hesselbarth
2013-08-12 18:46 ` [PATCH 3/9] PCI: mvebu: remove subsys_initcall Sebastian Hesselbarth
2013-08-13 7:19 ` Thomas Petazzoni
2013-08-13 8:06 ` Thierry Reding
2013-08-13 9:25 ` Sebastian Hesselbarth
2013-08-12 18:46 ` [PATCH 4/9] PCI: mvebu: add support for reset on GPIO Sebastian Hesselbarth
2013-08-13 0:56 ` Kumar Gala
2013-08-13 9:19 ` Sebastian Hesselbarth
2013-08-13 8:09 ` Thierry Reding
2013-08-13 8:30 ` Thomas Petazzoni
2013-08-13 9:59 ` Sascha Hauer
2013-08-13 10:03 ` Thierry Reding
2013-08-13 10:40 ` Sebastian Hesselbarth [this message]
2013-08-13 10:59 ` Philipp Zabel
2013-08-12 18:46 ` [PATCH 5/9] PCI: mvebu: add support for Marvell Dove SoCs Sebastian Hesselbarth
2013-08-12 20:54 ` [PATCH 0/9] ARM: dove: DT PCIe support Bjorn Helgaas
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