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

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Message-ID: <20140218202205.GA13835@kroah.com>
Date:	Tue, 18 Feb 2014 12:22:05 -0800
From:	Greg KH <gregkh@...uxfoundation.org>
To:	Jean-Jacques Hiblot <jjhiblot@...phandler.com>
Cc:	grant.likely@...aro.org, 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 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...

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