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/include/dm/root.h b/include/dm/root.h
index 02c7788..33f951b 100644
--- a/include/dm/root.h
+++ b/include/dm/root.h
@@ -46,6 +46,22 @@
int dm_scan_fdt(const void *blob, bool pre_reloc_only);
/**
+ * dm_scan_fdt_node() - Scan the device tree and bind drivers for a node
+ *
+ * This scans the subnodes of a device tree node and and creates a driver
+ * for each one.
+ *
+ * @parent: Parent device for the devices that will be created
+ * @blob: Pointer to device tree blob
+ * @offset: Offset of node to scan
+ * @pre_reloc_only: If true, bind only drivers with the DM_FLAG_PRE_RELOC
+ * flag. If false bind all drivers.
+ * @return 0 if OK, -ve on error
+ */
+int dm_scan_fdt_node(struct udevice *parent, const void *blob, int offset,
+ bool pre_reloc_only);
+
+/**
* dm_init_and_scan() - Initialise Driver Model structures and scan for devices
*
* This function initialises the roots of the driver tree and uclass trees,