linux-kernel - Re: [PATCH] of: add devres version of of

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Date:	Thu, 30 Aug 2012 21:53:03 -0500
From:	Rob Herring <robherring2@...il.com>
To:	"Karicheri, Muralidharan" <m-karicheri2@...com>
CC:	"grant.likely@...retlab.ca" <grant.likely@...retlab.ca>,
	"devicetree-discuss@...ts.ozlabs.org" 
	<devicetree-discuss@...ts.ozlabs.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] of: add devres version of of_iomap

On 08/30/2012 05:09 PM, Karicheri, Muralidharan wrote:
>>> -----Original Message-----
>>> From: Rob Herring [mailto:robherring2@...il.com]
>>> Sent: Thursday, August 30, 2012 2:27 PM
>>> To: Karicheri, Muralidharan
>>> Cc: grant.likely@...retlab.ca; devicetree-discuss@...ts.ozlabs.org; linux-
>>> kernel@...r.kernel.org
>>> Subject: Re: [PATCH] of: add devres version of of_iomap
>>>
>>> On 08/30/2012 10:32 AM, Murali Karicheri wrote:
>>>> This adds devres version of the of_iomap() to allow resource to be cleaned
>>>> through devres.
>>>
>>> If you have a struct device, then don't you already have a resource and
>>> can just use devm_ioremap in a driver? New drivers should not be using
>>> of_iomap.
>>>
> 
> That is the point. If you do a grep under driver, there are many drivers using the pattern
> like this. This helper function is mean to replace this code.
> 
> From dma/sirf-dma.c
> 
>         ret = of_address_to_resource(dn, 0, &res);
>         if (ret) {
>                 dev_err(dev, "Error parsing memory region!\n");
> 	       goto error;
>         }
> 
>         regs_start = res.start;
>         regs_size = resource_size(&res);
> 
>         base = devm_ioremap(dev, regs_start, regs_size);
>         if (!base) {
>                 dev_err(dev, "Error mapping memory region!\n");
> 	       goto error;
>         }
> 

That's wrong and should be fixed. The resource is already setup and
available to the probe function.

> Other instances.
> 
> edac/mpc85xx_edac.c
> media/video/fsl-viu.c
> mtd/nand/mpc5121_nfc.c

All PPC drivers that used the old of_platform_driver and also need to be
updated.

> 
> Some of these code uses devm_request_mem_region() as well. Isn't a good idea to add this helper
> that can be called by new drivers to replace this sequence? I could update the patch to do this call
> as well?

devm_request_and_ioremap

Rob

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