aboutsummaryrefslogtreecommitdiff
diff options
context:
space:
mode:
authorMarek Vasut <marex@denx.de>2022-07-08 23:50:43 +0200
committerSimon Glass <sjg@chromium.org>2022-09-21 10:37:46 +0200
commit13982ced2ccce0838afb6db87f05b2cd74355b56 (patch)
tree11c0694bfce26db823bcaf258b62eb825a981379
parent12ed6d4911ced1df099a365e0a994b54211b60f3 (diff)
downloadu-boot-13982ced2ccce0838afb6db87f05b2cd74355b56.zip
u-boot-13982ced2ccce0838afb6db87f05b2cd74355b56.tar.gz
u-boot-13982ced2ccce0838afb6db87f05b2cd74355b56.tar.bz2
cmd: fdt: Add support for reading stringlist property values
The fdt command currently handles stringlists as strings in 'fdt get value' subcommand. Since strings in FDT stringlists are separated by '\0', only the first value gets inserted into the environment variable passed to the 'fdt get value' command. Example, consider the following DT snippet: / { compatible = "foo", "bar" }; The following command only reports the first string in stringlist: => fdt get value var / compatible ; print var foo It is not possible to assign list of null-terminated strings into U-Boot environment variable. Add optional 'index' parameter to the subcommand 'fdt get value <var> <path> <prop> [<index>]' which lets user specify which string within the stringlist should be assigned into the 'var' variable. The default value of 'index' is 0 in case it is not present. This way the 'fdt' command API does not change and existing scripts are not broken. The following command now reports the Nth string in stringlist, counting from zero: => fdt get value var / compatible 1 ; print var bar Signed-off-by: Marek Vasut <marex@denx.de> Cc: Heinrich Schuchardt <heinrich.schuchardt@canonical.com> Cc: Simon Glass <sjg@chromium.org> Cc: Tom Rini <trini@konsulko.com>
-rw-r--r--cmd/fdt.c34
1 files changed, 28 insertions, 6 deletions
diff --git a/cmd/fdt.c b/cmd/fdt.c
index 842e6cb..6fbd920 100644
--- a/cmd/fdt.c
+++ b/cmd/fdt.c
@@ -48,11 +48,27 @@ void set_working_fdt_addr(ulong addr)
/*
* Get a value from the fdt and format it to be set in the environment
*/
-static int fdt_value_env_set(const void *nodep, int len, const char *var)
+static int fdt_value_env_set(const void *nodep, int len,
+ const char *var, int index)
{
- if (is_printable_string(nodep, len))
- env_set(var, (void *)nodep);
- else if (len == 4) {
+ if (is_printable_string(nodep, len)) {
+ const char *nodec = (const char *)nodep;
+ int i;
+
+ /*
+ * Iterate over all members in stringlist and find the one at
+ * offset $index. If no such index exists, indicate failure.
+ */
+ for (i = 0; i < len; i += strlen(nodec) + 1) {
+ if (index-- > 0)
+ continue;
+
+ env_set(var, nodec + i);
+ return 0;
+ }
+
+ return 1;
+ } else if (len == 4) {
char buf[11];
sprintf(buf, "0x%08X", fdt32_to_cpu(*(fdt32_t *)nodep));
@@ -426,10 +442,14 @@ static int do_fdt(struct cmd_tbl *cmdtp, int flag, int argc, char *const argv[])
return 0;
} else if (nodep && len > 0) {
if (subcmd[0] == 'v') {
+ int index = 0;
int ret;
+ if (argc == 7)
+ index = simple_strtoul(argv[6], NULL, 10);
+
ret = fdt_value_env_set(nodep, len,
- var);
+ var, index);
if (ret != 0)
return ret;
} else if (subcmd[0] == 'a') {
@@ -1085,7 +1105,9 @@ static char fdt_help_text[] =
"fdt resize [<extrasize>] - Resize fdt to size + padding to 4k addr + some optional <extrasize> if needed\n"
"fdt print <path> [<prop>] - Recursive print starting at <path>\n"
"fdt list <path> [<prop>] - Print one level starting at <path>\n"
- "fdt get value <var> <path> <prop> - Get <property> and store in <var>\n"
+ "fdt get value <var> <path> <prop> [<index>] - Get <property> and store in <var>\n"
+ " In case of stringlist property, use optional <index>\n"
+ " to select string within the stringlist. Default is 0.\n"
"fdt get name <var> <path> <index> - Get name of node <index> and store in <var>\n"
"fdt get addr <var> <path> <prop> - Get start address of <property> and store in <var>\n"
"fdt get size <var> <path> [<prop>] - Get size of [<property>] or num nodes and store in <var>\n"