From: Thierry Reding Date: Thu, 16 May 2013 15:55:19 +0000 (+0200) Subject: of/pci: Add of_pci_parse_bus_range() function X-Git-Tag: Ubuntu-5.13.0-19.19~22020^2~17^2 X-Git-Url: https://git.proxmox.com/?a=commitdiff_plain;h=4e23d3f505e8acfeac7cc33d4113fbb5a25c3090;p=mirror_ubuntu-jammy-kernel.git of/pci: Add of_pci_parse_bus_range() function This function can be used to parse a bus-range property as specified by device nodes representing PCI bridges. Signed-off-by: Thierry Reding Signed-off-by: Jason Cooper --- diff --git a/drivers/of/of_pci.c b/drivers/of/of_pci.c index 4dd7b9b80076..42c687a820ac 100644 --- a/drivers/of/of_pci.c +++ b/drivers/of/of_pci.c @@ -64,3 +64,28 @@ 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 91ec484e0045..7a04826018c0 100644 --- a/include/linux/of_pci.h +++ b/include/linux/of_pci.h @@ -11,5 +11,6 @@ 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); #endif