arm: mvebu: fix boot from UART when in fallback mode

[u-boot] / drivers / core / root.c

diff --git a/drivers/core/root.c b/drivers/core/root.c
index 0c00a4e051e328fe302f5b0051a6f9b39bf10ba7..976e2c4fdd9d6b3842f7db8a2781306a3739690f 100644 (file)
--- a/drivers/core/root.c
+++ b/drivers/core/root.c
@@ -15,7 +15,10 @@
 #include <dm/device.h>
 #include <dm/device-internal.h>
 #include <dm/lists.h>
+#include <dm/of.h>
+#include <dm/of_access.h>
 #include <dm/platdata.h>
+#include <dm/read.h>
 #include <dm/root.h>
 #include <dm/uclass.h>
 #include <dm/util.h>
@@ -147,7 +150,7 @@ void fix_devices(void)
 
 #endif
 
-int dm_init(void)
+int dm_init(bool of_live)
 {
        int ret;
 
@@ -167,7 +170,12 @@ int dm_init(void)
        if (ret)
                return ret;
 #if CONFIG_IS_ENABLED(OF_CONTROL)
-       DM_ROOT_NON_CONST->node = offset_to_ofnode(0);
+# if CONFIG_IS_ENABLED(OF_LIVE)
+       if (of_live)
+               DM_ROOT_NON_CONST->node = np_to_ofnode(gd->of_root);
+       else
+#endif
+               DM_ROOT_NON_CONST->node = offset_to_ofnode(0);
 #endif
        ret = device_probe(DM_ROOT_NON_CONST);
        if (ret)
@@ -206,6 +214,36 @@ int dm_scan_platdata(bool pre_reloc_only)
        return ret;
 }
 
+#if CONFIG_IS_ENABLED(OF_LIVE)
+static int dm_scan_fdt_live(struct udevice *parent,
+                           const struct device_node *node_parent,
+                           bool pre_reloc_only)
+{
+       struct device_node *np;
+       int ret = 0, err;
+
+       for (np = node_parent->child; np; np = np->sibling) {
+               if (pre_reloc_only &&
+                   !of_find_property(np, "u-boot,dm-pre-reloc", NULL))
+                       continue;
+               if (!of_device_is_available(np)) {
+                       pr_debug("   - ignoring disabled device\n");
+                       continue;
+               }
+               err = lists_bind_fdt(parent, np_to_ofnode(np), NULL);
+               if (err && !ret) {
+                       ret = err;
+                       debug("%s: ret=%d\n", np->name, ret);
+               }
+       }
+
+       if (ret)
+               dm_warn("Some drivers failed to bind\n");
+
+       return ret;
+}
+#endif /* CONFIG_IS_ENABLED(OF_LIVE) */
+
 #if CONFIG_IS_ENABLED(OF_CONTROL) && !CONFIG_IS_ENABLED(OF_PLATDATA)
 /**
  * dm_scan_fdt_node() - Scan the device tree and bind drivers for a node
@@ -232,7 +270,7 @@ static int dm_scan_fdt_node(struct udevice *parent, const void *blob,
                    !dm_fdt_pre_reloc(blob, offset))
                        continue;
                if (!fdtdec_get_is_enabled(blob, offset)) {
-                       dm_dbg("   - ignoring disabled device\n");
+                       pr_debug("   - ignoring disabled device\n");
                        continue;
                }
                err = lists_bind_fdt(parent, offset_to_ofnode(offset), NULL);
@@ -251,19 +289,61 @@ static int dm_scan_fdt_node(struct udevice *parent, const void *blob,
 
 int dm_scan_fdt_dev(struct udevice *dev)
 {
-       if (dev_of_offset(dev) == -1)
+       if (!dev_of_valid(dev))
                return 0;
 
+#if CONFIG_IS_ENABLED(OF_LIVE)
+       if (of_live_active())
+               return dm_scan_fdt_live(dev, dev_np(dev),
+                               gd->flags & GD_FLG_RELOC ? false : true);
+       else
+#endif
        return dm_scan_fdt_node(dev, gd->fdt_blob, dev_of_offset(dev),
                                gd->flags & GD_FLG_RELOC ? false : true);
 }
 
 int dm_scan_fdt(const void *blob, bool pre_reloc_only)
 {
+#if CONFIG_IS_ENABLED(OF_LIVE)
+       if (of_live_active())
+               return dm_scan_fdt_live(gd->dm_root, gd->of_root,
+                                       pre_reloc_only);
+       else
+#endif
        return dm_scan_fdt_node(gd->dm_root, blob, 0, pre_reloc_only);
 }
+#else
+static int dm_scan_fdt_node(struct udevice *parent, const void *blob,
+                           int offset, bool pre_reloc_only)
+{
+       return 0;
+}
 #endif
 
+int dm_extended_scan_fdt(const void *blob, bool pre_reloc_only)
+{
+       int node, ret;
+
+       ret = dm_scan_fdt(gd->fdt_blob, pre_reloc_only);
+       if (ret) {
+               debug("dm_scan_fdt() failed: %d\n", ret);
+               return ret;
+       }
+
+       /* bind fixed-clock */
+       node = ofnode_to_offset(ofnode_path("/clocks"));
+       /* if no DT "clocks" node, no need to go further */
+       if (node < 0)
+               return ret;
+
+       ret = dm_scan_fdt_node(gd->dm_root, gd->fdt_blob, node,
+                              pre_reloc_only);
+       if (ret)
+               debug("dm_scan_fdt_node() failed: %d\n", ret);
+
+       return ret;
+}
+
 __weak int dm_scan_other(bool pre_reloc_only)
 {
        return 0;
@@ -273,7 +353,7 @@ int dm_init_and_scan(bool pre_reloc_only)
 {
        int ret;
 
-       ret = dm_init();
+       ret = dm_init(IS_ENABLED(CONFIG_OF_LIVE));
        if (ret) {
                debug("dm_init() failed: %d\n", ret);
                return ret;
@@ -285,9 +365,9 @@ int dm_init_and_scan(bool pre_reloc_only)
        }
 
        if (CONFIG_IS_ENABLED(OF_CONTROL) && !CONFIG_IS_ENABLED(OF_PLATDATA)) {
-               ret = dm_scan_fdt(gd->fdt_blob, pre_reloc_only);
+               ret = dm_extended_scan_fdt(gd->fdt_blob, pre_reloc_only);
                if (ret) {
-                       debug("dm_scan_fdt() failed: %d\n", ret);
+                       debug("dm_extended_scan_dt() failed: %d\n", ret);
                        return ret;
                }
        }