sconfig: pass in devicetree filename

Instead of forcing the hardcoded 'devicetree.cb' filename under the
mainboard directory, this allows mainboards to select a filename for
the devicetree file.

This allows mainboard variants that need to use different devicetree
files to live under the same directory.

Change-Id: I761e676ba5d5f70d1fb86656b528f63db169fcef
Signed-off-by: Martin Roth <martinroth@google.com>
Reviewed-on: https://review.coreboot.org/12529
Tested-by: build bot (Jenkins)
Reviewed-by: Patrick Georgi <pgeorgi@google.com>

Makefile.inc

@@ -451,10 +451,10 @@ $(obj)/config.h: $(objutil)/kconfig/conf
 #######################################################################
 # needed objects that every mainboard uses
 # Creation of these is architecture and mainboard independent
-$(obj)/mainboard/$(MAINBOARDDIR)/static.c: $(src)/mainboard/$(MAINBOARDDIR)/devicetree.cb  $(objutil)/sconfig/sconfig
+$(obj)/mainboard/$(MAINBOARDDIR)/static.c: $(src)/mainboard/$(MAINBOARDDIR)/$(call strip_quotes, $(CONFIG_DEVICETREE)) $(objutil)/sconfig/sconfig
 	@printf "    SCONFIG    $(subst $(src)/,,$(<))\n"
 	mkdir -p $(obj)/mainboard/$(MAINBOARDDIR)
-	$(objutil)/sconfig/sconfig $(MAINBOARDDIR) $(obj)/mainboard/$(MAINBOARDDIR)
+	$(objutil)/sconfig/sconfig $(MAINBOARDDIR) $(obj)/mainboard/$(MAINBOARDDIR) $(call strip_quotes, $(CONFIG_DEVICETREE))
 
 ramstage-y+=$(obj)/mainboard/$(MAINBOARDDIR)/static.c
 romstage-y+=$(obj)/mainboard/$(MAINBOARDDIR)/static.c

src/Kconfig

@@ -358,6 +358,17 @@ config BOARD_ID_STRING
 	  This string is placed in the 'board_id' CBFS file for indicating
 	  board type.
 
+config DEVICETREE
+	string
+	default "devicetree.cb"
+	help
+	  This symbol allows mainboards to select a different file under their
+	  mainboard directory for the devicetree.cb file.  This allows the board
+	  variants that need different devicetrees to be in the same directory.
+
+	  Examples: "devicetree.variant.cb"
+	            "variant/devicetree.cb"
+
 config RAM_CODE_SUPPORT
 	bool
 	default n

util/sconfig/main.c

@@ -551,7 +551,7 @@ static void inherit_subsystem_ids(FILE *file, struct device *dev)
 
 static void usage(void)
 {
-	printf("usage: sconfig vendor/mainboard outputdir [-{s|b|k} outputfile]\n");
+	printf("usage: sconfig vendor/mainboard outputdir devicetree [-{s|b|k} outputfile]\n");
 	printf("\t-s file\tcreate ramstage static device map\n");
 	printf("\t-b file\tcreate bootblock init_mainboard()\n");
 	printf("\t-k file\tcreate Kconfig devicetree section\n");
@@ -559,27 +559,39 @@ static void usage(void)
 	exit (1);
 }
 
+enum {
+	VENDOR_MAINBOARD_ARG = 1,
+	OUTPUTDIR_ARG,
+	DEVICEFILE_ARG,
+	OUTPUTTYPE_ARG,
+	OUTPUTFILE_ARG
+};
+
+#define MIN_ARGS		4
+#define MAX_ARGS		6
 
 int main(int argc, char** argv) {
-	if (argc != 3 && argc != 5)
+	if (argc != MIN_ARGS && argc != MAX_ARGS)
 		usage();
 
-	char *mainboard=argv[1];
-	char *outputdir=argv[2];
-	char *devtree=malloc(strlen(mainboard)+30);
-	sprintf(devtree, "src/mainboard/%s/devicetree.cb", mainboard);
+	char *mainboard = argv[VENDOR_MAINBOARD_ARG];
+	char *outputdir = argv[OUTPUTDIR_ARG];
+	char *devfile = argv[DEVICEFILE_ARG];
+	char *devtree = malloc(strlen(mainboard) + strlen(devfile) + 30);
+	sprintf(devtree, "src/mainboard/%s/%s", mainboard, devfile);
 	char *outputc;
 
-	if (argc == 3) {
+	if (argc == MIN_ARGS) {
 		scan_mode = STATIC_MODE;
 		outputc=malloc(strlen(outputdir)+20);
 		sprintf(outputc, "%s/static.c", outputdir);
-	} else if (argc == 5) {
-		if ((argv[3][0] != '-') || (argv[3][2] == 0)) {
+	} else if (argc == MAX_ARGS) {
+		if ((argv[OUTPUTTYPE_ARG][0] != '-') ||
+			(argv[OUTPUTTYPE_ARG][2] == 0)) {
 			usage();
 		}
 
-		switch (argv[3][1]) {
+		switch (argv[OUTPUTTYPE_ARG][1]) {
 		case 's':
 			scan_mode = STATIC_MODE;
 			break;
@@ -593,7 +605,7 @@ int main(int argc, char** argv) {
 			usage();
 			break;
 		}
-		char *outputfile=argv[4];
+		char *outputfile = argv[OUTPUTFILE_ARG];
 
 		outputc=malloc(strlen(outputdir)+strlen(outputfile)+2);
 		sprintf(outputc, "%s/%s", outputdir, outputfile);