linux-kernel - Re: [GIT PULL] On-demand device probing

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Date:	Mon, 19 Oct 2015 07:35:05 -0500
From:	Rob Herring <robh+dt@...nel.org>
To:	David Woodhouse <dwmw2@...radead.org>
Cc:	Mark Brown <broonie@...nel.org>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Tomeu Vizoso <tomeu.vizoso@...labora.com>,
	Russell King <linux@....linux.org.uk>,
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	Stephen Boyd <sboyd@...eaurora.org>,
	Vinod Koul <vinod.koul@...el.com>,
	Dan Williams <dan.j.williams@...el.com>,
	Linus Walleij <linus.walleij@...aro.org>,
	Alexandre Courbot <gnurou@...il.com>,
	Thierry Reding <thierry.reding@...il.com>,
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Subject: Re: [GIT PULL] On-demand device probing

On Mon, Oct 19, 2015 at 4:44 AM, David Woodhouse <dwmw2@...radead.org> wrote:
> On Sun, 2015-10-18 at 20:53 +0100, Mark Brown wrote:
>> On Sun, Oct 18, 2015 at 12:37:57PM -0700, Greg Kroah-Hartman wrote:
>> > On Sun, Oct 18, 2015 at 08:29:31PM +0100, Mark Brown wrote:
>> > > On Fri, Oct 16, 2015 at 11:57:50PM -0700, Greg Kroah-Hartman wrote:
>>
>> > > > I can't see adding calls like this all over the tree just to solve a
>> > > > bus-specific problem, you are adding of_* calls where they aren't
>> > > > needed, or wanted, at all.
>>
>> > > This isn't bus specific, I'm not sure what makes you say that?
>>
>> > You are making it bus-specific by putting these calls all over the tree
>> > in different bus subsystems semi-randomly for all I can determine.
>>
>> Do you mean firmware rather than bus here?  I think that's the confusion
>> I have...
>
> Certainly, if it literally is adding of_* calls then that would seem to
> be gratuitously firmware-specific. Nothing should be using those these
> days; any new code should be using the generic device property APIs
> (except in special cases).

See version 2 of the series[1] which did that. It became obvious that
was pointless because the call paths ended up looking like this:

Generic subsystem code -> DT look-up code -> fwnode_probe_device ->
of_probe_device

Rob

[1] http://lists.infradead.org/pipermail/linux-arm-kernel/2015-July/361137.html
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