dm: Make driver model available before board_init()

For some boards board_init() will change GPIOs, so we need to have driver
model available before then. Adjust the board init to arrange this, but
enable it for driver model only, just to be safe.

This does create additional #ifdef logic, but it is safer than trying to
make a pervasive change which may cause some boards to break.

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

common/board_r.c

@@ -715,6 +715,15 @@ init_fnc_t init_sequence_r[] = {
 	/* TODO: could x86/PPC have this also perhaps? */
 #ifdef CONFIG_ARM
 	initr_caches,
+#endif
+	initr_reloc_global_data,
+	initr_barrier,
+	initr_malloc,
+	bootstage_relocate,
+#ifdef CONFIG_DM
+	initr_dm,
+#endif
+#ifdef CONFIG_ARM
 	board_init,	/* Setup chipselects */
 #endif
 	/*
@@ -726,16 +735,7 @@ init_fnc_t init_sequence_r[] = {
 #ifdef CONFIG_CLOCKS
 	set_cpu_clk_info, /* Setup clock information */
 #endif
-	initr_reloc_global_data,
-	initr_barrier,
-	initr_malloc,
-	bootstage_relocate,
-#ifdef CONFIG_DM_SERIAL
-	stdio_init,
-#endif
-#ifdef CONFIG_DM
-	initr_dm,
-#endif
+	stdio_init_tables,
 	initr_serial,
 	initr_announce,
 	INIT_FUNC_WATCHDOG_RESET
@@ -821,9 +821,7 @@ init_fnc_t init_sequence_r[] = {
 	 */
 	initr_pci,
 #endif
-#ifndef CONFIG_DM_SERIAL
-	stdio_init,
-#endif
+	stdio_add_devices,
 	initr_jumptable,
 #ifdef CONFIG_API
 	initr_api,

common/stdio.c

@@ -215,7 +215,7 @@ int stdio_deregister(const char *devname)
 }
 #endif	/* CONFIG_SYS_STDIO_DEREGISTER */
 
-int stdio_init (void)
+int stdio_init_tables(void)
 {
 #if defined(CONFIG_NEEDS_MANUAL_RELOC)
 	/* already relocated for current ARM implementation */
@@ -232,6 +232,11 @@ int stdio_init (void)
 	/* Initialize the list */
 	INIT_LIST_HEAD(&(devs.list));
 
+	return 0;
+}
+
+int stdio_add_devices(void)
+{
 #ifdef CONFIG_SYS_I2C
 	i2c_init_all();
 #else
@@ -265,5 +270,14 @@ int stdio_init (void)
 #ifdef CONFIG_CBMEM_CONSOLE
 	cbmemc_init();
 #endif
-	return (0);
+
+	return 0;
+}
+
+int stdio_init(void)
+{
+	stdio_init_tables();
+	stdio_add_devices();
+
+	return 0;
 }

include/stdio_dev.h

@@ -78,7 +78,29 @@ extern char *stdio_names[MAX_FILES];
  */
 int	stdio_register (struct stdio_dev * dev);
 int stdio_register_dev(struct stdio_dev *dev, struct stdio_dev **devp);
-int	stdio_init (void);
+
+/**
+ * stdio_init_tables() - set up stdio tables ready for devices
+ *
+ * This does not add any devices, but just prepares stdio for use.
+ */
+int stdio_init_tables(void);
+
+/**
+ * stdio_add_devices() - Add stdio devices to the table
+ *
+ * This makes calls to all the various subsystems that use stdio, to make
+ * them register with stdio.
+ */
+int stdio_add_devices(void);
+
+/**
+ * stdio_init() - Sets up stdio ready for use
+ *
+ * This calls stdio_init_tables() and stdio_add_devices()
+ */
+int stdio_init(void);
+
 void	stdio_print_current_devices(void);
 #ifdef CONFIG_SYS_STDIO_DEREGISTER
 int	stdio_deregister(const char *devname);