linux-kernel - Re: [PATCH] reset: socfpga: use arch

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Message-ID: <1412845410.6809.3.camel@pengutronix.de>
Date:	Thu, 09 Oct 2014 11:03:30 +0200
From:	Philipp Zabel <p.zabel@...gutronix.de>
To:	dinguyen@...nsource.altera.com
Cc:	dinh.linux@...il.com, s.trumtrar@...gutronix.de,
	grant.likely@...aro.org, robh+dt@...nel.org,
	atull@...nsource.altera.com, devicetree@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] reset: socfpga: use arch_initcall for early
 initialization

Am Mittwoch, den 08.10.2014, 21:44 -0500 schrieb
dinguyen@...nsource.altera.com:
> From: Dinh Nguyen <dinguyen@...nsource.altera.com>
> 
> There are certain drivers that are required to get loaded very early using
> arch_initcall. An example of such a driver is the SOCFPGA's FPGA bridge driver.
> This driver has to get loaded early because it needs to enable FPGA components
> that are connected to the bridge.
> 
> This FPGA bridge driver will using the reset controller API to toggle it's
> reset bits, thus, it needs the reset driver to be loaded as early as possible
> in order for it to get used properly.

Without knowing the details, this sounds like the wrong approach. Can't
the bridge driver return -EPROBE_DEFER until the reset controller is
available?

regards
Philipp

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