linux-kernel - Re: [PATCH v7 1/2] drivers: base: add support for registering notifier about deferred probe

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Date:	Thu, 14 Apr 2016 14:51:39 -0700
From:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:	Russell King - ARM Linux <linux@....linux.org.uk>
Cc:	Marek Szyprowski <m.szyprowski@...sung.com>,
	linux-samsung-soc@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
	Ulf Hansson <ulf.hansson@...aro.org>,
	Krzysztof Kozlowski <k.kozlowski@...sung.com>,
	Bartlomiej Zolnierkiewicz <b.zolnierkie@...sung.com>
Subject: Re: [PATCH v7 1/2] drivers: base: add support for registering
 notifier about deferred probe

On Thu, Apr 14, 2016 at 10:33:22PM +0100, Russell King - ARM Linux wrote:
> The problem that's being addressed here is that there's no way at the
> moment to know when the drivers on a different bus (namely the platform
> bus) have probed and are providing the clock and power domain resources
> necessary to be able to read these identifying values.
> 
> I guess if you don't like a notifier, the other alternative is to
> setup a delayed workqueue and have the workqueue repeatedly attempt
> to register the devices until they all succeed.  That's not
> particularly nice, because we'd be wasting CPU cycles running
> that workqueue for no reason until all the devices get registered.

I like that idea, it handles the issue of this crazy hardware where it
belongs, in that bus subsystem :)

thanks,

greg k-h