[PATCH v2 2/2] cmd/part.c: implement "part name" subcommand

[Rasmus Villemoes]

This is a natural buddy to the existing "part number", allowing one to
get the partition name for a given partition number.

Signed-off-by: Rasmus Villemoes <ravi at prevas.dk>
---
v2: include documentation update

 cmd/part.c             | 16 +++++++++++++++-
 doc/usage/cmd/part.rst | 13 +++++++++++++
 2 files changed, 28 insertions(+), 1 deletion(-)

diff --git a/cmd/part.c b/cmd/part.c
index db7bc5819c0..975a0a08a99 100644
--- a/cmd/part.c
+++ b/cmd/part.c
@@ -25,7 +25,8 @@
 enum cmd_part_info {
 	CMD_PART_INFO_START = 0,
 	CMD_PART_INFO_SIZE,
-	CMD_PART_INFO_NUMBER
+	CMD_PART_INFO_NUMBER,
+	CMD_PART_INFO_NAME,
 };
 
 static int do_part_uuid(int argc, char *const argv[])
@@ -154,6 +155,9 @@ static int do_part_info(int argc, char *const argv[], enum cmd_part_info param)
 	case CMD_PART_INFO_NUMBER:
 		snprintf(buf, sizeof(buf), "0x%x", part);
 		break;
+	case CMD_PART_INFO_NAME:
+		snprintf(buf, sizeof(buf), "%s", info.name);
+		break;
 	default:
 		printf("** Unknown cmd_part_info value: %d\n", param);
 		return 1;
@@ -182,6 +186,11 @@ static int do_part_number(int argc, char *const argv[])
 	return do_part_info(argc, argv, CMD_PART_INFO_NUMBER);
 }
 
+static int do_part_name(int argc, char *const argv[])
+{
+	return do_part_info(argc, argv, CMD_PART_INFO_NAME);
+}
+
 static int do_part_set(int argc, char *const argv[])
 {
 	const char *devname, *partstr, *typestr;
@@ -273,6 +282,8 @@ static int do_part(struct cmd_tbl *cmdtp, int flag, int argc,
 		return do_part_size(argc - 2, argv + 2);
 	else if (!strcmp(argv[1], "number"))
 		return do_part_number(argc - 2, argv + 2);
+	else if (!strcmp(argv[1], "name"))
+		return do_part_name(argc - 2, argv + 2);
 	else if (!strcmp(argv[1], "types"))
 		return do_part_types(argc - 2, argv + 2);
 	else if (!strcmp(argv[1], "set"))
@@ -305,6 +316,9 @@ U_BOOT_CMD(
 	"part number <interface> <dev> <part> <varname>\n"
 	"    - set environment variable to the partition number using the partition name\n"
 	"      part must be specified as partition name\n"
+	"part name <interface> <dev> <part> <varname>\n"
+	"    - set environment variable to the partition name using the partition number\n"
+	"      part must be specified as partition number\n"
 #ifdef CONFIG_PARTITION_TYPE_GUID
 	"part type <interface> <dev>:<part>\n"
 	"    - print partition type\n"
diff --git a/doc/usage/cmd/part.rst b/doc/usage/cmd/part.rst
index e7f6e54ecea..df510685154 100644
--- a/doc/usage/cmd/part.rst
+++ b/doc/usage/cmd/part.rst
@@ -16,6 +16,7 @@ Synopsis
     part start <interface> <dev> <part> <varname>
     part size <interface> <dev> <part> <varname>
     part number <interface> <dev> <part> <varname>
+    part name <interface> <dev> <part> <varname>
     part set <interface> <dev> <part> <type>
     part type <interface> <dev>:<part> [varname]
     part types
@@ -86,6 +87,18 @@ part must be specified as partition name.
     varname
         a variable to store the current partition number value into
 
+The 'part name' command sets an environment variable to the partition name using the partition number,
+part must be specified as partition number.
+
+    interface
+        interface for accessing the block device (mmc, sata, scsi, usb, ....)
+    dev
+        device number
+    part
+        partition number
+    varname
+        a variable to store the current partition name into
+
 The 'part set' command sets the type of a partition. This is useful when
 autodetection fails or does not do the correct thing:
 
-- 
2.51.0