expo: cedit: Support reading settings from CMOS RAM

Add a command to read edit settings from CMOS RAM, using the cedit
definition to indicate which registers and bits are used.

Signed-off-by: Simon Glass <sjg@chromium.org>

1 files changed, 36 insertions, 0 deletions

diff --git a/cmd/cedit.c b/cmd/cedit.c
index 95d5c22c2f..2ff284f4cd 100644
--- a/cmd/cedit.c
+++ b/cmd/cedit.c
@@ -210,6 +210,40 @@ static int do_cedit_write_cmos(struct cmd_tbl *cmdtp, int flag, int argc,
 	return 0;
 }
 
+static int do_cedit_read_cmos(struct cmd_tbl *cmdtp, int flag, int argc,
+			      char *const argv[])
+{
+	struct udevice *dev;
+	bool verbose = false;
+	int ret;
+
+	if (check_cur_expo())
+		return CMD_RET_FAILURE;
+
+	if (argc > 1 && !strcmp(argv[1], "-v")) {
+		verbose = true;
+		argc--;
+		argv++;
+	}
+
+	if (argc > 1)
+		ret = uclass_get_device_by_name(UCLASS_RTC, argv[1], &dev);
+	else
+		ret = uclass_first_device_err(UCLASS_RTC, &dev);
+	if (ret) {
+		printf("Failed to get RTC device: %dE\n", ret);
+		return CMD_RET_FAILURE;
+	}
+
+	ret = cedit_read_settings_cmos(cur_exp, dev, verbose);
+	if (ret) {
+		printf("Failed to read settings from CMOS: %dE\n", ret);
+		return CMD_RET_FAILURE;
+	}
+
+	return 0;
+}
+
 static int do_cedit_run(struct cmd_tbl *cmdtp, int flag, int argc,
 			char *const argv[])
 {
@@ -243,6 +277,7 @@ static char cedit_help_text[] =
 	"cedit write_fdt <i/f> <dev[:part]> <filename>    - write settings\n"
 	"cedit read_env [-v]                              - read settings from env vars\n"
 	"cedit write_env [-v]                             - write settings to env vars\n"
+	"cedit read_cmos [-v] [dev]                       - read settings from CMOS RAM\n"
 	"cedit write_cmos [-v] [dev]                      - write settings to CMOS RAM\n"
 	"cedit run                                        - run config editor";
 #endif /* CONFIG_SYS_LONGHELP */
@@ -253,6 +288,7 @@ U_BOOT_CMD_WITH_SUBCMDS(cedit, "Configuration editor", cedit_help_text,
 	U_BOOT_SUBCMD_MKENT(write_fdt, 5, 1, do_cedit_write_fdt),
 	U_BOOT_SUBCMD_MKENT(read_env, 2, 1, do_cedit_read_env),
 	U_BOOT_SUBCMD_MKENT(write_env, 2, 1, do_cedit_write_env),
+	U_BOOT_SUBCMD_MKENT(read_cmos, 2, 1, do_cedit_read_cmos),
 	U_BOOT_SUBCMD_MKENT(write_cmos, 2, 1, do_cedit_write_cmos),
 	U_BOOT_SUBCMD_MKENT(run, 1, 1, do_cedit_run),
 );