Messages in this thread | | | From | Grant Likely <> | Subject | Re: [PATCH 3/4] of/pci: Add of_pci_get_bus() function | Date | Wed, 13 Feb 2013 22:56:07 +0000 |
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On Mon, 11 Feb 2013 09:22:19 +0100, Thierry Reding <thierry.reding@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@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 > > -- > To unsubscribe from this list: send the line "unsubscribe linux-kernel" in > the body of a message to majordomo@vger.kernel.org > More majordomo info at http://vger.kernel.org/majordomo-info.html > Please read the FAQ at http://www.tux.org/lkml/
-- Grant Likely, B.Sc, P.Eng. Secret Lab Technologies, Ltd.
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