[PATCH 3/4] of/pci: Add of_pci_get_bus() function

[Grant Likely]

On Mon, 11 Feb 2013 09:22:19 +0100, Thierry Reding <thierry.reding at avionic-design.de> wrote:
> This function can be used to parse the number of a device's parent PCI
> bus from a standard 5-cell PCI resource.
> 
> Signed-off-by: Thierry Reding <thierry.reding at avionic-design.de>

This patch should be deferred until there is another patch in the same
series that actually uses it.

g.

> ---
>  drivers/of/of_pci.c    | 21 +++++++++++++++++++++
>  include/linux/of_pci.h |  1 +
>  2 files changed, 22 insertions(+)
> 
> diff --git a/drivers/of/of_pci.c b/drivers/of/of_pci.c
> index 4dd7b9b..d6e6de5 100644
> --- a/drivers/of/of_pci.c
> +++ b/drivers/of/of_pci.c
> @@ -43,6 +43,27 @@ struct device_node *of_pci_find_child_device(struct device_node *parent,
>  EXPORT_SYMBOL_GPL(of_pci_find_child_device);
>  
>  /**
> + * of_pci_get_bus() - Get bus number for a device node
> + * @np: device node
> + *
> + * Parses a standard 5-cell PCI resource and returns the 8-bit bus number of
> + * the device's parent PCI bus. On error a negative error code is returned.
> + */
> +int of_pci_get_bus(struct device_node *np)
> +{
> +	unsigned int size;
> +	const __be32 *reg;
> +
> +	reg = of_get_property(np, "reg", &size);
> +
> +	if (!reg || size < 5 * sizeof(__be32))
> +		return -EINVAL;
> +
> +	return (be32_to_cpup(reg) >> 16) & 0xff;
> +}
> +EXPORT_SYMBOL_GPL(of_pci_get_bus);
> +
> +/**
>   * of_pci_get_devfn() - Get device and function numbers for a device node
>   * @np: device node
>   *
> diff --git a/include/linux/of_pci.h b/include/linux/of_pci.h
> index 91ec484..9118321 100644
> --- a/include/linux/of_pci.h
> +++ b/include/linux/of_pci.h
> @@ -10,6 +10,7 @@ int of_irq_map_pci(const struct pci_dev *pdev, struct of_irq *out_irq);
>  struct device_node;
>  struct device_node *of_pci_find_child_device(struct device_node *parent,
>  					     unsigned int devfn);
> +int of_pci_get_bus(struct device_node *np);
>  int of_pci_get_devfn(struct device_node *np);
>  
>  #endif
> -- 
> 1.8.1.2
> 
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-- 
Grant Likely, B.Sc, P.Eng.
Secret Lab Technologies, Ltd.