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feat(fdt-wrappers): add function to find or add a sudnode 

This change adds a new utility function - `fdtw_find_or_add_subnode`
to find a subnode. If the subnode is not present, the function adds
it in the flattened device tree.

Signed-off-by: Ruchika Gupta <ruchika.gupta@linaro.org>
Change-Id: Idf3ceddc57761ac015763d4a8b004877bcad766a
This commit is contained in:
Ruchika Gupta 2022-04-08 13:16:16 +05:30 committed by Manish Pandey
parent 19a9cc3a1b
commit dea8ee0d3f
2 changed files with 25 additions and 2 deletions
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23
common/fdt_wrappers.c
View File

@ -1,5 +1,5 @@
/*
* Copyright (c) 2018-2021, ARM Limited and Contributors. All rights reserved.
* Copyright (c) 2018-2022, ARM Limited and Contributors. All rights reserved.
*
* SPDX-License-Identifier: BSD-3-Clause
*/
@ -618,3 +618,24 @@ int fdtw_for_each_cpu(const void *dtb,
return ret;
}
/*
* Find a given node in device tree. If not present, add it.
* Returns offset of node found/added on success, and < 0 on error.
*/
int fdtw_find_or_add_subnode(void *fdt, int parentoffset, const char *name)
{
int offset;
offset = fdt_subnode_offset(fdt, parentoffset, name);
if (offset == -FDT_ERR_NOTFOUND) {
offset = fdt_add_subnode(fdt, parentoffset, name);
}
if (offset < 0) {
ERROR("%s: %s: %s\n", __func__, name, fdt_strerror(offset));
}
return offset;
}

4
include/common/fdt_wrappers.h
View File

@ -1,5 +1,5 @@
/*
* Copyright (c) 2018-2021, ARM Limited and Contributors. All rights reserved.
* Copyright (c) 2018-2022, ARM Limited and Contributors. All rights reserved.
*
* SPDX-License-Identifier: BSD-3-Clause
*/
@ -44,6 +44,8 @@ uint64_t fdtw_translate_address(const void *dtb, int bus_node,
int fdtw_for_each_cpu(const void *fdt,
int (*callback)(const void *dtb, int node, uintptr_t mpidr));
int fdtw_find_or_add_subnode(void *fdt, int parentoffset, const char *name);
static inline uint32_t fdt_blob_size(const void *dtb)
{
const uint32_t *dtb_header = dtb;