linux-kernel - Re: [GIT PULL] at91: drivers for 3.18 #2

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Date:	Tue, 09 Sep 2014 11:27:12 +0200
From:	Arnd Bergmann <arnd@...db.de>
To:	Maxime Ripard <maxime.ripard@...e-electrons.com>
Cc:	Nicolas Ferre <nicolas.ferre@...el.com>,
	Olof Johansson <olof@...om.net>, arm@...nel.org,
	Linux Kernel list <linux-kernel@...r.kernel.org>,
	linux-arm-kernel <linux-arm-kernel@...ts.infradead.org>,
	Alexandre Belloni <alexandre.belloni@...e-electrons.com>,
	Boris BREZILLON <boris.brezillon@...e-electrons.com>,
	Daniel Lezcano <daniel.lezcano@...aro.org>,
	Jean-Christophe PLAGNIOL-VILLARD <plagnioj@...osoft.com>,
	Ludovic Desroches <ludovic.desroches@...el.com>
Subject: Re: [GIT PULL] at91: drivers for 3.18 #2

On Tuesday 09 September 2014 11:15:20 Maxime Ripard wrote:
> 
> > One of the problems with the current interface is that it requires
> > statically declaring platform_device structures, which is something
> > that has been on Greg's list of device model antipatterns for a long
> > time.
> 
> I didn't find any difference with how you declare platform_devices
> compared to the old-usual way in board files, or was it something on
> the list too ? 

Yes. We never really bothered with cleaning up the existing static
platform_device instances, because the plan is to move away from
board files to DT anyway, but in short, if you ever need to add
a platform device to a legacy board file, do it like

	pdev = platform_device_alloc(...);
	platform_device_register(dev);

or

	platform_device_register_simple(...);

or

	static const struct platform_device_info info __initconst = { ... };
	platform_device_register_full(&info);

but not

	static struct platform_device pdev = { ... };
	platform_device_register(&pdev);

Unfortunately, the early platform_device only allows the last type.

	Arnd
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