[PATCHv8 05/19] of/pci: Add of_pci_parse_bus_range() function

[Rob Herring]

On 04/09/2013 04:06 PM, Thomas Petazzoni wrote:
> From: Thierry Reding <thierry.reding at avionic-design.de>
> 
> This function can be used to parse a bus-range property as specified by
> device nodes representing PCI bridges.
> 
> Signed-off-by: Thierry Reding <thierry.reding at avionic-design.de>

Reviewed-by: Rob Herring <rob.herring at calxeda.com>

> ---
>  drivers/of/of_pci.c    |   25 +++++++++++++++++++++++++
>  include/linux/of_pci.h |    1 +
>  2 files changed, 26 insertions(+)
> 
> diff --git a/drivers/of/of_pci.c b/drivers/of/of_pci.c
> index b77e8d8..e9106dc 100644
> --- a/drivers/of/of_pci.c
> +++ b/drivers/of/of_pci.c
> @@ -232,3 +232,28 @@ int of_pci_get_devfn(struct device_node *np)
>  	return (be32_to_cpup(reg) >> 8) & 0xff;
>  }
>  EXPORT_SYMBOL_GPL(of_pci_get_devfn);
> +
> +/**
> + * of_pci_parse_bus_range() - parse the bus-range property of a PCI device
> + * @node: device node
> + * @res: address to a struct resource to return the bus-range
> + *
> + * Returns 0 on success or a negative error-code on failure.
> + */
> +int of_pci_parse_bus_range(struct device_node *node, struct resource *res)
> +{
> +	const __be32 *values;
> +	int len;
> +
> +	values = of_get_property(node, "bus-range", &len);
> +	if (!values || len < sizeof(*values) * 2)
> +		return -EINVAL;
> +
> +	res->name = node->name;
> +	res->start = be32_to_cpup(values++);
> +	res->end = be32_to_cpup(values);
> +	res->flags = IORESOURCE_BUS;
> +
> +	return 0;
> +}
> +EXPORT_SYMBOL_GPL(of_pci_parse_bus_range);
> diff --git a/include/linux/of_pci.h b/include/linux/of_pci.h
> index 302aca0..be97a6f 100644
> --- a/include/linux/of_pci.h
> +++ b/include/linux/of_pci.h
> @@ -12,6 +12,7 @@ struct device_node;
>  struct device_node *of_pci_find_child_device(struct device_node *parent,
>  					     unsigned int devfn);
>  int of_pci_get_devfn(struct device_node *np);
> +int of_pci_parse_bus_range(struct device_node *node, struct resource *res);
>  
>  void pci_process_bridge_OF_ranges(struct pci_controller *hose,
>  			struct device_node *dev, int primary);
>