globalvar: Add support for printing all global variables

This could previously only be done with 'devinfo global'. While
this is still possible this adds a more direct access via the
globalvar command. This variant also adds a '*' in front of
the variable if the corresponding non volatile variable exists.

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

commands/global.c

@@ -37,6 +37,11 @@ static int do_global(int argc, char *argv[])
 		}
 	}
 
+	if (argc == optind) {
+		globalvar_print();
+		return 0;
+	}
+
 	argc -= optind;
 	argv += optind;
 

common/globalvar.c

@@ -197,6 +197,11 @@ void nvvar_print(void)
 	device_param_print(&nv_device);
 }
 
+void globalvar_print(void)
+{
+	device_param_print(&global_device);
+}
+
 /*
  * globalvar_get_match
  *

include/globalvar.h

@@ -77,6 +77,7 @@ int nvvar_load(void);
 void nvvar_print(void);
 int nvvar_add(const char *name, const char *value);
 int nvvar_remove(const char *name);
+void globalvar_print(void);
 
 #else
 static inline int globalvar_add_simple(const char *name, const char *value)