linux-kernel - Re: [PATCH v2 01/12] device: property: delay device-driver matches

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Message-ID: <CAJZ5v0gMx=DA0f8i9wdMvkYTyOhr0WKh-T6L7rjcxeaAjNMW3g@mail.gmail.com>
Date:	Fri, 17 Jul 2015 01:41:16 +0200
From:	"Rafael J. Wysocki" <rafael@...nel.org>
To:	Mark Brown <broonie@...nel.org>
Cc:	Tomeu Vizoso <tomeu.vizoso@...labora.com>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	ACPI Devel Maling List <linux-acpi@...r.kernel.org>,
	dri-devel@...ts.freedesktop.org, linux-fbdev@...r.kernel.org,
	linux-gpio@...r.kernel.org,
	"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
	linux-pwm@...r.kernel.org, "Rafael J. Wysocki" <rjw@...ysocki.net>,
	alsa-devel@...a-project.org,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Subject: Re: [PATCH v2 01/12] device: property: delay device-driver matches

Hi Mark,

On Thu, Jul 16, 2015 at 10:23 PM, Mark Brown <broonie@...nel.org> wrote:
> On Wed, Jul 01, 2015 at 11:40:56AM +0200, Tomeu Vizoso wrote:
>
>> Delay matches of platform devices until late_initcall, when we are sure
>> that all built-in drivers have been registered already. This is needed
>> to prevent deferred probes because of some dependencies' drivers not
>> having registered yet.
>
> I have to say I'm still not 100% clear that special casing platform
> devices makes sense here - I can see that platform devices are usually
> the first devices to instantiate but there are other kinds of devices
> and it's not obvious what the benefit of specifically picking out
> platform devices as opposed to just deferring all devices is.

Some existing devices cannot be deferred without redesigning things quite a bit.

What I was talking about, though, was to use an opt-in mechanism for
that which could be set for all platform devices, for example, by
default, but it might be set for other bus types too if that's useful.

Thanks,
Rafael
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