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fdt: Add a function to return PCI BDF triplet

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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>
This commit is contained in:
Thierry Reding 2014-08-26 17:33:54 +02:00 committed by Simon Glass
parent 56f42242f0
commit 9f85eee72a
2 changed files with 25 additions and 0 deletions
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11
include/fdtdec.h
View file

@ -649,4 +649,15 @@ 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

14
lib/fdtdec.c
View file

@ -765,4 +765,18 @@ 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