Hi Thierry, On 18 August 2014 01:16, Thierry Reding <thierry.red...@gmail.com> wrote: > From: Thierry Reding <tred...@nvidia.com> > > Given a device tree node, the fdt_n_addr_cells() function will walk up > the device tree and search for an #address-cells property. It returns > the number of cells required by the device tree node to represent an > address. > > Similarly the fdt_n_size_cells() function returns the number of cells > required by the given device tree node to represent a size. It achieves > that by walking up the device tree in seach for a #size-cells property. > > If no #address-cells or #size-cells property can be found, both of the > functions return 1. > > Signed-off-by: Thierry Reding <tred...@nvidia.com> > --- > include/libfdt.h | 28 ++++++++++++++++++++++++++++ > lib/libfdt/fdt_ro.c | 36 ++++++++++++++++++++++++++++++++++++ > 2 files changed, 64 insertions(+) > > diff --git a/include/libfdt.h b/include/libfdt.h > index a1ef1e15df3d..e7f991b388cf 100644 > --- a/include/libfdt.h > +++ b/include/libfdt.h > @@ -1638,4 +1638,32 @@ int fdt_find_regions(const void *fdt, char * const > inc[], int inc_count, > struct fdt_region region[], int max_regions, > char *path, int path_len, int add_string_tab); > > +/** > + * fdt_n_addr_cells() - find the number of address cells required by a node > + * > + * Looks up the #address-cells property of the node to examine. If that has > + * no such property, walks up the device tree until it finds one in one of > + * the device's parents. If no #address-cells property is found, it is > + * assumed to be 1. > + * > + * @param fdt FDT blob > + * @param node node to examine > + * @return number of address cells > + */ > +int fdt_n_addr_cells(const void *fdt, int node);
There is a new fdt_address_cells() recently that looks suitable. > + > +/** > + * fdt_n_size_cells() - find the number of size cells required by a node Also fdt_size_cells(). Regards, Simon _______________________________________________ U-Boot mailing list U-Boot@lists.denx.de http://lists.denx.de/mailman/listinfo/u-boot