linux-kernel - Re: [PATCH] dt: platform driver: Fill the resources before probe and defer if needed

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Date:	Tue, 18 Feb 2014 22:34:12 +0000
From:	Grant Likely <grant.likely@...aro.org>
To:	Greg KH <gregkh@...uxfoundation.org>,
	Jean-Jacques Hiblot <jjhiblot@...phandler.com>
Cc:	robh+dt@...nel.org, linux-kernel@...r.kernel.org,
	devicetree@...r.kernel.org, gregory.clement@...e-electrons.com,
	linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH] dt: platform driver: Fill the resources before probe and defer if needed

On Tue, 18 Feb 2014 12:22:05 -0800, Greg KH <gregkh@...uxfoundation.org> wrote:
> On Thu, Feb 13, 2014 at 10:57:09AM +0100, Jean-Jacques Hiblot wrote:
> > The goal of this patch is to allow drivers to be probed even if at the time of
> > the DT parsing some of their ressources are not available yet.
> > 
> > In the current situation, the resource of a platform device are filled from the
> > DT at the time the device is created (of_device_alloc()). The drawbackof this
> > is that a device sitting close to the top of the DT (ahb for example) but
> > depending on ressources that are initialized later (IRQ domain dynamically
> > created for example)  will fail to probe because the ressources don't exist
> > at this time.
> > 
> > This patch fills the resource structure only before the device is probed and
> > will defer the probe if the resource are not available yet.
> > 
> > Signed-off-by: Jean-Jacques Hiblot <jjhiblot@...phandler.com>
> > Reviewed-by: Gregory CLEMENT <gregory.clement@...e-electrons.com>
> > ---
> >  drivers/base/platform.c     |  6 ++++
> >  drivers/of/platform.c       | 71 +++++++++++++++++++++++++++++----------------
> >  include/linux/of_platform.h | 10 +++++++
> >  3 files changed, 62 insertions(+), 25 deletions(-)
> 
> I need some others to ack this before I can take it...

Yes, please let me review it first, and I'll probably want to take it
through the devicetree branch.

g.

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