From: robherring2@gmail.com (Rob Herring)
To: linux-arm-kernel@lists.infradead.org
Subject: moving gpio driver to drivers/gpio, how to initialize?
Date: Wed, 11 May 2011 11:07:22 -0500 [thread overview]
Message-ID: <4DCAB43A.8090003@gmail.com> (raw)
In-Reply-To: <20110511142016.GG3188@pulham.picochip.com>
On 05/11/2011 09:20 AM, Jamie Iles wrote:
> On Wed, May 11, 2011 at 04:11:53PM +0200, Sascha Hauer wrote:
>> I think we mostly agree on moving the gpio drivers from arch/arm to
>> drivers/gpio. A question we have to answer is how we want to initialize
>> these drivers. On nomadik these are platform drivers, but on i.MX and
>> others platform drivers initialize too late, since the gpio functions
>> are already used at init_machine time. PXA uses sysdev for their gpios,
>> but is this the correct answer?
>
> The omap gpio driver registers the platform_driver as a
> postcore_initcall so that it can use GPIO in the machine init for this
> reason. A platform_device/driver feels like the right way to do this
> IMHO.
>
An early_platform_device may be a better approach to avoid init level
tweaking. This would be needed for timers if the SH timer approach is
adopted.
Rob
prev parent reply other threads:[~2011-05-11 16:07 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-05-11 14:11 moving gpio driver to drivers/gpio, how to initialize? Sascha Hauer
2011-05-11 14:20 ` Jamie Iles
2011-05-11 14:42 ` Sascha Hauer
2011-05-11 16:07 ` Rob Herring [this message]
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