From: Thierry Reding treding@nvidia.com
The fdtdec_pci_get_bdf() function returns the bus, device, function triplet of a PCI device by parsing the "reg" property according to the PCI device tree binding.
Acked-by: Simon Glass sjg@chromium.org Signed-off-by: Thierry Reding treding@nvidia.com --- include/fdtdec.h | 11 +++++++++++ lib/fdtdec.c | 14 ++++++++++++++ 2 files changed, 25 insertions(+)
diff --git a/include/fdtdec.h b/include/fdtdec.h index c35d378602d2..5c669a5c8e03 100644 --- a/include/fdtdec.h +++ b/include/fdtdec.h @@ -635,4 +635,15 @@ int fdt_get_named_resource(const void *fdt, int node, const char *property, const char *prop_names, const char *name, struct fdt_resource *res);
+/** + * Look at the reg property of a device node that represents a PCI device + * and parse the bus, device and function number from it. + * + * @param fdt FDT blob + * @param node node to examine + * @param bdf returns bus, device, function triplet + * @return 0 if ok, negative on error + */ +int fdtdec_pci_get_bdf(const void *fdt, int node, int *bdf); + #endif diff --git a/lib/fdtdec.c b/lib/fdtdec.c index c3fa82f1a28a..fa5da0c0147d 100644 --- a/lib/fdtdec.c +++ b/lib/fdtdec.c @@ -748,4 +748,18 @@ int fdt_get_named_resource(const void *fdt, int node, const char *property,
return fdt_get_resource(fdt, node, property, index, res); } + +int fdtdec_pci_get_bdf(const void *fdt, int node, int *bdf) +{ + const fdt32_t *prop; + int len; + + prop = fdt_getprop(fdt, node, "reg", &len); + if (!prop) + return len; + + *bdf = fdt32_to_cpu(*prop) & 0xffffff; + + return 0; +} #endif