If we are creating reference (handles) to nodes in a device tree we need to first create a new phandle in node and this needs a new phandle value. So we search through the whole dtb to find the max phandle value and return the next greater value for a new phandle allocation.
Signed-off-by: Kumar Gala galak@kernel.crashing.org --- * Hopefully fixed white space issues
common/fdt_support.c | 18 ++++++++++++++++++ include/fdt_support.h | 1 + 2 files changed, 19 insertions(+), 0 deletions(-)
diff --git a/common/fdt_support.c b/common/fdt_support.c index 718b635..65751aa 100644 --- a/common/fdt_support.c +++ b/common/fdt_support.c @@ -1151,4 +1151,22 @@ int fdt_node_offset_by_compat_reg(void *blob, const char *compat, return -FDT_ERR_NOTFOUND; }
+/** + * fdt_alloc_phandle: Return next free phandle value + * + * @blob: ptr to device tree + */ +int fdt_alloc_phandle(void *blob) +{ + int offset, len, phandle = 0; + const u32 *val;
+ for (offset = fdt_next_node(blob, -1, NULL); offset >= 0; + offset = fdt_next_node(blob, offset, NULL)) { + val = fdt_getprop(blob, offset, "linux,phandle", &len); + if (val) + phandle = max(*val, phandle); + } + + return phandle + 1; +} diff --git a/include/fdt_support.h b/include/fdt_support.h index 54af9fe..871ef45 100644 --- a/include/fdt_support.h +++ b/include/fdt_support.h @@ -86,6 +86,7 @@ void fdt_del_node_and_alias(void *blob, const char *alias); u64 fdt_translate_address(void *blob, int node_offset, const u32 *in_addr); int fdt_node_offset_by_compat_reg(void *blob, const char *compat, phys_addr_t compat_off); +int fdt_alloc_phandle(void *blob);
#endif /* ifdef CONFIG_OF_LIBFDT */ #endif /* ifndef __FDT_SUPPORT_H */