scripts/dump-target-info.pl: add new function to DUMP devices

Add new function to dump-targer-info.pl to DUMP devices provided a
matching target/subtarget.

Example:

./scripts/dump-targer-info.pl devices ipq806x/generic

will produce the sorted list of devices defined in the following format:

device_id device_name

Devices may have alternative names, the script will dump each
alternative name in the same line of device_id.

Following the pattern:

device_id "PRIMARY DEVICE NAME" "ALT0 DEVICE NAME" "ALT1 DEVICE NAME" ...

Example:

tplink_ad7200 "TP-Link AD7200 v1/v2" "TP-Link Talon AD7200 v1/v2"

Signed-off-by: Christian Marangi <ansuelsmth@gmail.com>

scripts/dump-target-info.pl

@@ -4,7 +4,7 @@ use strict;
 use warnings;
 use Cwd;
 
-my (%targets, %architectures, %kernels);
+my (%targets, %architectures, %kernels, %devices);
 
 $ENV{'TOPDIR'} = Cwd::getcwd();
 
@@ -56,6 +56,68 @@ sub parse_targetinfo {
 	}
 }
 
+sub parse_devices {
+	my ($target_dir, $subtarget) = @_;
+
+	if (open M, "make -C '$target_dir' --no-print-directory DUMP=1 TARGET_BUILD=1 SUBTARGET='$subtarget' V=s |") {
+		my ($device_profile, $device_name, @device_alt_names, $device_is_alt);
+		while (defined(my $line = readline M)) {
+			chomp $line;
+
+			if ($line =~ /^Target-Profile-Name: (.+)$/) {
+				$device_name = $1;
+			}
+			elsif ($line =~ /^Target-Profile: DEVICE_(.+)$/) {
+				$device_profile = $1;
+			}
+			# Logic behind this.
+			# DUMP duplicate info for each alternative device name and
+			# the alternative device name are printed first before the
+			# primary device name
+			# Alternative device titles always have the full list of
+			# all the alternative device name.
+			# The device name pattern for an alternative device name is
+			# Target-Profile-Name: ALT_NAME (PRIMARY_NAME)
+			# We compare the detected device name and check if it does
+			# match the alternative device name pattern with one of
+			# the alternative device name in Alternative device titles:
+			# If an alternative device name is detected,
+			# alternative device is skipped.
+			elsif ($line =~ /^Alternative device titles:$/) {
+				while (defined($line = readline M)) {
+					if ($line =~ /^- (.+)$/) {
+						if ($device_name =~ /^\Q$1\E \((.+)\)$/) {
+							$device_is_alt = 1;
+							last;
+						}
+						push @device_alt_names, $1;
+					}
+					else {
+						last;
+					}
+				}
+			}
+			if ($line =~ /^@\@$/) {
+				if ($device_name && $device_profile && ! $device_is_alt) {
+					push @{$devices{$device_profile}}, $device_name;
+
+					if (scalar @device_alt_names) {
+						foreach my $device_alt_name (sort values @device_alt_names) {
+							push @{$devices{$device_profile}}, $device_alt_name;
+						}
+					}
+				}
+
+				undef $device_name;
+				undef $device_profile;
+				undef $device_is_alt;
+				@device_alt_names = ();
+			}
+		}
+		close M;
+	}
+}
+
 sub get_targetinfo {
 	foreach my $target_makefile (glob "target/linux/*/Makefile") {
 		my ($target_dir) = $target_makefile =~ m!^(.+)/Makefile$!;
@@ -86,6 +148,15 @@ sub get_targetinfo {
 	}
 }
 
+sub get_devices {
+	my ($target_subtarget) = @_;
+	my ($target, $subtarget) = split /\//, $target_subtarget;
+
+	my ($target_dir) = "target/linux/" . $target;
+
+	parse_devices($target_dir, $subtarget)
+}
+
 if (@ARGV == 1 && $ARGV[0] eq 'targets') {
 	get_targetinfo();
 	foreach my $target_name (sort keys %targets) {
@@ -104,8 +175,15 @@ elsif (@ARGV == 1 && $ARGV[0] eq 'kernels') {
 		printf "%s %s\n", $target_name, join ' ', @{$kernels{$target_name}};
 	}
 }
+elsif (@ARGV == 2 && $ARGV[0] eq 'devices') {
+	get_devices($ARGV[1]);
+	foreach my $device (sort keys %devices) {
+		printf "%s \"%s\"\n", $device, join '" "', @{$devices{$device}};
+	}
+}
 else {
 	print "Usage: $0 targets\n";
 	print "Usage: $0 architectures\n";
 	print "Usage: $0 kernels\n";
+	print "Usage: $0 devices <target/subtarget>\n";
 }