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