On Wed, Jul 26, 2017 at 05:46:58PM +0300, Pantelis Antoniou wrote: > In some cases you need to add a property but the contents of it > are not known at creation time, merely the extend of it. > > This method allows you to create a property of a given size > which will be set to zero while a pointer to the property data > will be provided. > > Signed-off-by: Pantelis Antoniou <pantelis.antoniou@xxxxxxxxxxxx> > --- [snip] > /** > + * fdt_setprop _placeholder - allocate space for a property > + * @fdt: pointer to the device tree blob > + * @nodeoffset: offset of the node whose property to change > + * @name: name of the property to change > + * @len: length of the property value > + * @prop_data: return pointer to property data > + * > + * fdt_setprop_placeholer() allocates the named property in the given node. > + * If the property exists it is resized. In either case it filled with > + * zeroes and if a prop_data argument is provided a pointer to the > + * property data is returned. Doc comment hasn't been updated to reflect the latest chnages (not zeroed). > + * This function may insert or delete data from the blob, and will > + * therefore change the offsets of some existing nodes. > + * > + * returns: > + * 0, on success > + * -FDT_ERR_NOSPACE, there is insufficient free space in the blob to > + * contain the new property value > + * -FDT_ERR_BADOFFSET, nodeoffset did not point to FDT_BEGIN_NODE tag > + * -FDT_ERR_BADLAYOUT, > + * -FDT_ERR_BADMAGIC, > + * -FDT_ERR_BADVERSION, > + * -FDT_ERR_BADSTATE, > + * -FDT_ERR_BADSTRUCTURE, > + * -FDT_ERR_BADLAYOUT, > + * -FDT_ERR_TRUNCATED, standard meanings > + */ > +int fdt_setprop_placeholder(void *fdt, int nodeoffset, const char *name, > + int len, void **prop_data); > + > +/** > * fdt_setprop_u32 - set a property to a 32-bit integer > * @fdt: pointer to the device tree blob > * @nodeoffset: offset of the node whose property to change -- David Gibson | I'll have my music baroque, and my code david AT gibson.dropbear.id.au | minimalist, thank you. NOT _the_ _other_ | _way_ _around_! http://www.ozlabs.org/~dgibson
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