dm: Provide a function to scan child FDT nodes
At present only root nodes in the device tree are scanned for devices.
But some devices can have children. For example a SPI bus may have
several children for each of its chip selects.
Add a function which scans subnodes and binds devices for each one. This
can be used for the root node scan also, so change it.
A device can call this function in its bind() or probe() methods to bind
its children.
Signed-off-by: Simon Glass <sjg@chromium.org>
diff --git a/drivers/core/root.c b/drivers/core/root.c
index 6059756..4f9c7e7 100644
--- a/drivers/core/root.c
+++ b/drivers/core/root.c
@@ -80,29 +80,32 @@
}
#ifdef CONFIG_OF_CONTROL
-int dm_scan_fdt(const void *blob, bool pre_reloc_only)
+int dm_scan_fdt_node(struct udevice *parent, const void *blob, int offset,
+ bool pre_reloc_only)
{
- int offset = 0;
int ret = 0, err;
- int depth = 0;
- do {
- offset = fdt_next_node(blob, offset, &depth);
- if (offset > 0 && depth == 1) {
- if (pre_reloc_only &&
- !fdt_getprop(blob, offset, "u-boot,dm-pre-reloc", NULL))
- continue;
- err = lists_bind_fdt(gd->dm_root, blob, offset);
- if (err && !ret)
- ret = err;
- }
- } while (offset > 0);
+ for (offset = fdt_first_subnode(blob, offset);
+ offset > 0;
+ offset = fdt_next_subnode(blob, offset)) {
+ if (pre_reloc_only &&
+ !fdt_getprop(blob, offset, "u-boot,dm-pre-reloc", NULL))
+ continue;
+ err = lists_bind_fdt(parent, blob, offset);
+ if (err && !ret)
+ ret = err;
+ }
if (ret)
dm_warn("Some drivers failed to bind\n");
return ret;
}
+
+int dm_scan_fdt(const void *blob, bool pre_reloc_only)
+{
+ return dm_scan_fdt_node(gd->dm_root, blob, 0, pre_reloc_only);
+}
#endif
int dm_init_and_scan(bool pre_reloc_only)