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[fdt] Add ability to locate node by phandle

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Signed-off-by: Michael Brown <mcb30@ipxe.org>
This commit is contained in:
Michael Brown
2025-07-22 13:37:05 +01:00
parent e01e5ff7c6
commit fb082bd4cd
3 changed files with 133 additions and 67 deletions
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51
src/core/fdt.c
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@@ -482,6 +482,57 @@ int fdt_alias ( struct fdt *fdt, const char *name, unsigned int *offset ) {
return 0;
}
/**
* Find node by package handle (phandle)
*
* @v fdt Device tree
* @v phandle Package handle
* @v offset Offset to fill in
* @ret rc Return status code
*/
int fdt_phandle ( struct fdt *fdt, uint32_t phandle, unsigned int *offset ) {
struct fdt_descriptor desc;
uint32_t value;
int depth;
int rc;
/* Initialise offset */
*offset = 0;
/* Find node with matching phandle */
for ( depth = -1 ; ; depth += desc.depth, *offset = desc.next ) {
/* Describe token */
if ( ( rc = fdt_describe ( fdt, *offset, &desc ) ) != 0 ) {
DBGC ( fdt, "FDT +%#04x has malformed node: %s\n",
*offset, strerror ( rc ) );
return rc;
}
/* Terminate when we exit the root node */
if ( ( depth == 0 ) && ( desc.depth < 0 ) )
break;
/* Ignore non-nodes */
if ( ( ! desc.name ) || desc.data )
continue;
/* Check for matching "phandle" or "linux-phandle" property */
if ( ( ( ( rc = fdt_u32 ( fdt, *offset, "phandle",
&value ) ) == 0 ) ||
( ( rc = fdt_u32 ( fdt, *offset, "linux,phandle",
&value ) ) == 0 ) ) &&
( value == phandle ) ) {
DBGC2 ( fdt, "FDT +%#04x has phandle %#02x\n",
*offset, phandle );
return 0;
}
}
DBGC ( fdt, "FDT has no phandle %#02x\n", phandle );
return -ENOENT;
}
/**
* Find property
*