[PATCH v5 1/5] common: add $global.serial_number with device tree fixup

[Oleksij Rempel]

From: Ahmad Fatoum <a.fatoum at pengutronix.de>

This new variable can be set by boards from C code or from the
environment to change the serial number fixed up into the kernel device
tree.

Signed-off-by: Ahmad Fatoum <a.fatoum at pengutronix.de>
Signed-off-by: Oleksij Rempel <o.rempel at pengutronix.de>
---
 common/misc.c    | 16 ++++++++++++++++
 common/oftree.c  |  5 +++++
 include/common.h |  3 +++
 3 files changed, 24 insertions(+)

diff --git a/common/misc.c b/common/misc.c
index 226635f0d4..3b3bc05bfd 100644
--- a/common/misc.c
+++ b/common/misc.c
@@ -149,6 +149,7 @@ EXPORT_SYMBOL(barebox_get_model);
 BAREBOX_MAGICVAR(global.model, "Product name of this hardware");
 
 static char *hostname;
+static char *serial_number;
 
 /*
  * The hostname is supposed to be the shortname of a board. It should
@@ -179,6 +180,21 @@ EXPORT_SYMBOL(barebox_set_hostname_no_overwrite);
 BAREBOX_MAGICVAR(global.hostname,
 		"shortname of the board. Also used as hostname for DHCP requests");
 
+void barebox_set_serial_number(const char *__serial_number)
+{
+	globalvar_add_simple_string("serial_number", &serial_number);
+
+	free(serial_number);
+	serial_number = xstrdup(__serial_number);
+}
+
+const char *barebox_get_serial_number(void)
+{
+	return serial_number;
+}
+
+BAREBOX_MAGICVAR(global.serial_number, "Board serial number");
+
 void __noreturn panic(const char *fmt, ...)
 {
 	va_list args;
diff --git a/common/oftree.c b/common/oftree.c
index bce0ff09d6..995e7201bf 100644
--- a/common/oftree.c
+++ b/common/oftree.c
@@ -206,6 +206,11 @@ static int of_fixup_bootargs(struct device_node *root, void *unused)
 	int err;
 	int instance = reset_source_get_instance();
 	struct device_d *dev;
+	const char *serialno;
+
+	serialno = getenv("global.serial_number");
+	if (serialno)
+		of_property_write_string(root, "serial-number", serialno);
 
 	node = of_create_node(root, "/chosen");
 	if (!node)
diff --git a/include/common.h b/include/common.h
index 4167d4676e..967502a7ab 100644
--- a/include/common.h
+++ b/include/common.h
@@ -126,4 +126,7 @@ const char *barebox_get_hostname(void);
 void barebox_set_hostname(const char *);
 void barebox_set_hostname_no_overwrite(const char *);
 
+const char *barebox_get_serial_number(void);
+void barebox_set_serial_number(const char *);
+
 #endif	/* __COMMON_H_ */
-- 
2.30.2