From 8c767c227d38954a736f55e33b119786f1d740b1 Mon Sep 17 00:00:00 2001 From: Sascha Hauer Date: Thu, 12 Sep 2019 10:24:42 +0200 Subject: add of_diff command The of_diff command compares two device trees against each other and prints a diff-like result. This can be handy to find out the differences between the barebox live tree and the one we start the kernel with. Another usecase would be to examine the changes our of_fixup process introduces (of_diff - +) Signed-off-by: Sascha Hauer --- commands/of_diff.c | 108 +++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 108 insertions(+) create mode 100644 commands/of_diff.c (limited to 'commands/of_diff.c') diff --git a/commands/of_diff.c b/commands/of_diff.c new file mode 100644 index 0000000000..8ef006dea8 --- /dev/null +++ b/commands/of_diff.c @@ -0,0 +1,108 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * of_diff.c - compare device tree files + * + * Copyright (c) 2019 Sascha Hauer , Pengutronix + * + */ + +#include +#include +#include +#include +#include +#include +#include +#include +#include + +static struct device_node *get_tree(const char *filename, struct device_node *root) +{ + struct device_node *node; + void *fdt; + size_t size; + int ret; + + if (!strcmp(filename, "-")) { + node = of_get_root_node(); + if (!node) + return ERR_PTR(-ENOENT); + + return of_copy_node(NULL, node); + } + + if (!strcmp(filename, "+")) { + node = of_get_root_node(); + if (!node) + return ERR_PTR(-ENOENT); + + node = of_copy_node(NULL, root); + + of_fix_tree(node); + + return node; + } + + ret = read_file_2(filename, &size, &fdt, FILESIZE_MAX); + if (ret) + return ERR_PTR(ret); + + node = of_unflatten_dtb(fdt); + + free(fdt); + + return node; +} + +static int do_of_diff(int argc, char *argv[]) +{ + int ret = 0; + struct device_node *a, *b, *root; + + if (argc < 3) + return COMMAND_ERROR_USAGE; + + root = of_get_root_node(); + a = get_tree(argv[1], root); + b = get_tree(argv[2], root); + + if (IS_ERR(a)) { + printf("Cannot read %s: %s\n", argv[1], strerrorp(a)); + ret = COMMAND_ERROR; + a = NULL; + goto out; + } + + if (IS_ERR(b)) { + printf("Cannot read %s: %s\n", argv[2], strerrorp(b)); + ret = COMMAND_ERROR; + b = NULL; + goto out; + } + + of_diff(a, b, 0); + + ret = 0; +out: + if (a && a != root) + of_delete_node(a); + if (b && b != root) + of_delete_node(b); + + return ret; +} + +BAREBOX_CMD_HELP_START(of_diff) +BAREBOX_CMD_HELP_TEXT("This command prints a diff between two given device trees.") +BAREBOX_CMD_HELP_TEXT("The device trees are given as dtb files or:") +BAREBOX_CMD_HELP_TEXT("'-' to compare against the barebox live tree, or") +BAREBOX_CMD_HELP_TEXT("'+' to compare against the fixed barebox live tree") +BAREBOX_CMD_HELP_END + +BAREBOX_CMD_START(of_diff) + .cmd = do_of_diff, + BAREBOX_CMD_DESC("diff device trees") + BAREBOX_CMD_OPTS(" ") + BAREBOX_CMD_GROUP(CMD_GRP_MISC) + BAREBOX_CMD_HELP(cmd_of_diff_help) +BAREBOX_CMD_END -- cgit v1.2.3