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

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Message-ID: <503FB074.7080702@gmail.com>
Date:	Thu, 30 Aug 2012 13:27:00 -0500
From:	Rob Herring <robherring2@...il.com>
To:	Murali Karicheri <m-karicheri2@...com>
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.

Rob

> 
> Signed-off-by: Murali Karicheri <m-karicheri2@...com>
> ---
>  drivers/of/address.c       |   26 ++++++++++++++++++++++++--
>  include/linux/of_address.h |    2 ++
>  2 files changed, 26 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/of/address.c b/drivers/of/address.c
> index 7e262a6..d3da426 100644
> --- a/drivers/of/address.c
> +++ b/drivers/of/address.c
> @@ -602,10 +602,9 @@ struct device_node *of_find_matching_node_by_address(struct device_node *from,
>  	return NULL;
>  }
>  
> -
>  /**
>   * of_iomap - Maps the memory mapped IO for a given device_node
> - * @device:	the device whose io range will be mapped
> + * @device_node: Ptr to the device node that has the reg property
>   * @index:	index of the io range
>   *
>   * Returns a pointer to the mapped memory
> @@ -620,3 +619,26 @@ void __iomem *of_iomap(struct device_node *np, int index)
>  	return ioremap(res.start, resource_size(&res));
>  }
>  EXPORT_SYMBOL(of_iomap);
> +
> +/**
> + * of_devm_iomap - devres version of of_iomap
> + * @device:	the device whose io range will be mapped
> + * @index:	index of the io range
> + *
> + * Returns a pointer to the mapped memory
> + */
> +void __iomem *of_devm_iomap(struct device *dev, int index)
> +{
> +	struct device_node *np;
> +	struct resource res;
> +
> +	if (!dev)
> +		return NULL;
> +
> +	np = dev->of_node;
> +	if (of_address_to_resource(np, index, &res))
> +		return NULL;
> +
> +	return devm_ioremap(dev, res.start, resource_size(&res));
> +}
> +EXPORT_SYMBOL(of_devm_iomap);
> diff --git a/include/linux/of_address.h b/include/linux/of_address.h
> index 01b925a..67efa5f 100644
> --- a/include/linux/of_address.h
> +++ b/include/linux/of_address.h
> @@ -3,6 +3,7 @@
>  #include <linux/ioport.h>
>  #include <linux/errno.h>
>  #include <linux/of.h>
> +#include <linux/device.h>
>  
>  #ifdef CONFIG_OF_ADDRESS
>  extern u64 of_translate_address(struct device_node *np, const __be32 *addr);
> @@ -13,6 +14,7 @@ extern struct device_node *of_find_matching_node_by_address(
>  					const struct of_device_id *matches,
>  					u64 base_address);
>  extern void __iomem *of_iomap(struct device_node *device, int index);
> +extern void __iomem *of_devm_iomap(struct device *dev, int index);
>  
>  /* Extract an address from a device, returns the region size and
>   * the address space flags too. The PCI version uses a BAR number
> 
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