commands: add of_display_timings

A lot of boards use display-timings nodes to define the timings of one or more
displays. This command makes it possible to list and select displays which are
defined in a device tree.

Signed-off-by: Teresa Gámez <t.gamez@phytec.de>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

commands/Kconfig

@@ -1973,6 +1973,21 @@ config CMD_OF_PROPERTY
 	  [00 11 22 .. nn]  - byte stream
 	  If the value does not start with '<' or '[' it is interpreted as string
 
+config CMD_OF_DISPLAY_TIMINGS
+	tristate
+	select OFTREE
+	prompt "of_display_timings"
+	help
+	  List and select display timings
+
+	  Usage: of_display_timings [-lS] [-s path] [-f dtb]
+
+	  Options:
+		  -l		list path of all available display-timings
+		  -S		list path of all selected display-timings
+		  -s path	select display-timings and register oftree fixup
+		  -f dtb	work on dtb. Has no effect on -s option
+
 config CMD_OFTREE
 	tristate
 	select OFTREE

commands/Makefile

@@ -76,6 +76,7 @@ obj-$(CONFIG_CMD_OFTREE)	+= oftree.o
 obj-$(CONFIG_CMD_OF_PROPERTY)	+= of_property.o
 obj-$(CONFIG_CMD_OF_NODE)	+= of_node.o
 obj-$(CONFIG_CMD_OF_DUMP)	+= of_dump.o
+obj-$(CONFIG_CMD_OF_DISPLAY_TIMINGS)	+= of_display_timings.o
 obj-$(CONFIG_CMD_MAGICVAR)	+= magicvar.o
 obj-$(CONFIG_CMD_IOMEM)		+= iomemport.o
 obj-$(CONFIG_CMD_LINUX_EXEC)	+= linux_exec.o

commands/of_display_timings.c

@@ -0,0 +1,164 @@
+/*
+ * of_display_timings.c - list and select display_timings
+ *
+ * Copyright (c) 2014 Teresa Gámez <t.gamez@phytec.de> PHYTEC Messtechnik GmbH
+ *
+ * See file CREDITS for list of people who contributed to this
+ * project.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2
+ * as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ */
+
+#include <common.h>
+#include <filetype.h>
+#include <libfile.h>
+#include <of.h>
+#include <command.h>
+#include <malloc.h>
+#include <complete.h>
+#include <asm/byteorder.h>
+#include <getopt.h>
+#include <linux/err.h>
+#include <string.h>
+
+static int of_display_timing(struct device_node *root, void *timingpath)
+{
+	int ret = 0;
+	struct device_node *display;
+
+	display = of_find_node_by_path_from(root, timingpath);
+	if (!display) {
+		pr_err("Path to display-timings is not vaild.\n");
+		ret = -EINVAL;
+		goto out;
+	}
+
+	ret = of_set_property_to_child_phandle(display, "native-mode");
+	if (ret)
+		pr_err("Could not set display\n");
+out:
+	return ret;
+}
+
+static int do_of_display_timings(int argc, char *argv[])
+{
+	int opt;
+	int list = 0;
+	int selected = 0;
+	struct device_node *root = NULL;
+	struct device_node *display = NULL;
+	struct device_node *timings = NULL;
+	char *timingpath = NULL;
+	char *dtbfile = NULL;
+
+	while ((opt = getopt(argc, argv, "sS:lf:")) > 0) {
+		switch (opt) {
+		case 'l':
+			list = 1;
+			break;
+		case 'f':
+			dtbfile = optarg;
+			break;
+		case 's':
+			selected = 1;
+			break;
+		case 'S':
+			timingpath = xzalloc(strlen(optarg) + 1);
+			strcpy(timingpath, optarg);
+			break;
+		default:
+			return COMMAND_ERROR_USAGE;
+		}
+	}
+
+	/* Check if external dtb given */
+	if (dtbfile) {
+		void *fdt;
+		size_t size;
+
+		fdt = read_file(dtbfile, &size);
+		if (!fdt) {
+			pr_err("unable to read %s: %s\n", dtbfile,
+				strerror(errno));
+			return -errno;
+		}
+
+		if (file_detect_type(fdt, size) != filetype_oftree) {
+			pr_err("%s is not a oftree file.\n", dtbfile);
+			free(fdt);
+			return -EINVAL;
+		}
+
+		root = of_unflatten_dtb(fdt);
+
+		free(fdt);
+
+		if (IS_ERR(root))
+			return PTR_ERR(root);
+
+	} else {
+		root = of_get_root_node();
+	}
+
+	if (list) {
+		int found = 0;
+		const char *node = "display-timings";
+
+		for_each_node_by_name_from(display, root, node) {
+			for_each_child_of_node(display, timings) {
+				printf("%s\n", timings->full_name);
+				found = 1;
+			}
+		}
+
+		if (!found)
+			printf("No display-timings found.\n");
+	}
+
+	if (selected) {
+		int found = 0;
+		const char *node = "display-timings";
+
+		for_each_node_by_name_from(display, root, node) {
+			timings = of_parse_phandle_from(display, root,
+							"native-mode", 0);
+			if (!timings)
+				continue;
+
+			printf("%s\n", timings->full_name);
+			found = 1;
+		}
+
+		if (!found)
+			printf("No selected display-timings found.\n");
+	}
+
+	if (timingpath)
+		of_register_fixup(of_display_timing, timingpath);
+
+	return 0;
+}
+
+BAREBOX_CMD_HELP_START(of_display_timings)
+BAREBOX_CMD_HELP_TEXT("Options:")
+BAREBOX_CMD_HELP_OPT("-l",  "list path of all available display-timings\n")
+BAREBOX_CMD_HELP_OPT("-s",  "list path of all selected display-timings\n")
+BAREBOX_CMD_HELP_OPT("-S path",  "select display-timings and register oftree fixup\n")
+BAREBOX_CMD_HELP_OPT("-f dtb",  "work on dtb. Has no effect on -s option\n")
+BAREBOX_CMD_HELP_END
+
+BAREBOX_CMD_START(of_display_timings)
+	.cmd	= do_of_display_timings,
+	BAREBOX_CMD_DESC("print and select display-timings")
+	BAREBOX_CMD_OPTS("[-ls] [-S path] [-f dtb]")
+	BAREBOX_CMD_GROUP(CMD_GRP_MISC)
+	BAREBOX_CMD_COMPLETE(devicetree_file_complete)
+	BAREBOX_CMD_HELP(cmd_of_display_timings_help)
+BAREBOX_CMD_END