linux-kernel - Re: [PATCH v2] dt: platform driver: Fill the resources before probe and defer if needed

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Message-Id: <20140308073758.DA63FC408EC@trevor.secretlab.ca>
Date:	Sat, 08 Mar 2014 07:37:58 +0000
From:	Grant Likely <grant.likely@...aro.org>
To:	Jean-Jacques Hiblot <jjhiblot@...phandler.com>,
	gregkh@...uxfoundation.org, robh+dt@...nel.org
Cc:	gregory.clement@...e-electrons.com, devicetree@...r.kernel.org,
	linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
	Jean-Jacques Hiblot <jjhiblot@...phandler.com>
Subject: Re: [PATCH v2] dt: platform driver: Fill the resources before probe and defer if needed

On Fri, 21 Feb 2014 14:18:40 +0100, Jean-Jacques Hiblot <jjhiblot@...phandler.com> 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.

Hi Jean-Jacques

[...]
> +int of_platform_device_prepare(struct platform_device *dev)
> +{
> +	struct device_node *np;
> +	int i, irq_index;
> +	struct resource *res;
> +
> +	/*
> +	 * This function applies only devices described in the DT.
> +	 * Other platform devices have their ressources already populated.
> +	 */
> +	np = dev->dev.of_node;
> +	if (!np)
> +		return 0;

I believe we already talked about the above test. This function must
only process devices created by of_platform_populate(). Merely checking
the of_node pointer is not a sufficient test because there are other
paths in the kernel for creating platform_devices that might get a node
pointer attached to it.

g.

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