dm: core: Add a new api to get indexed device address

Add new api to get device address based on index.

Signed-off-by: Mugunthan V N <mugunthanvnm@ti.com>
Acked-by: Jagan Teki <jteki@openedev.com>
[Rebased on master]
Signed-off-by: Jagan Teki <jteki@openedev.com>

drivers/core/device.c

@@ -581,17 +581,35 @@ const char *dev_get_uclass_name(struct udevice *dev)
 	return dev->uclass->uc_drv->name;
 }
 
-fdt_addr_t dev_get_addr(struct udevice *dev)
+fdt_addr_t dev_get_addr_index(struct udevice *dev, int index)
 {
 #if CONFIG_IS_ENABLED(OF_CONTROL)
 	fdt_addr_t addr;
 
 	if (CONFIG_IS_ENABLED(OF_TRANSLATE)) {
 		const fdt32_t *reg;
+		int len = 0;
+		int na, ns;
 
-		reg = fdt_getprop(gd->fdt_blob, dev->of_offset, "reg", NULL);
-		if (!reg)
+		na = fdt_address_cells(gd->fdt_blob, dev->parent->of_offset);
+		if (na < 1) {
+			debug("bad #address-cells\n");
 			return FDT_ADDR_T_NONE;
+		}
+
+		ns = fdt_size_cells(gd->fdt_blob, dev->parent->of_offset);
+		if (ns < 0) {
+			debug("bad #size-cells\n");
+			return FDT_ADDR_T_NONE;
+		}
+
+		reg = fdt_getprop(gd->fdt_blob, dev->of_offset, "reg", &len);
+		if (!reg || (len <= (index * sizeof(fdt32_t) * (na + ns)))) {
+			debug("Req index out of range\n");
+			return FDT_ADDR_T_NONE;
+		}
+
+		reg += index * (na + ns);
 
 		/*
 		 * Use the full-fledged translate function for complex
@@ -607,7 +625,7 @@ fdt_addr_t dev_get_addr(struct udevice *dev)
 		addr = fdtdec_get_addr_size_auto_parent(gd->fdt_blob,
 							dev->parent->of_offset,
 							dev->of_offset, "reg",
-							0, NULL);
+							index, NULL);
 		if (CONFIG_IS_ENABLED(SIMPLE_BUS) && addr != FDT_ADDR_T_NONE) {
 			if (device_get_uclass_id(dev->parent) ==
 			    UCLASS_SIMPLE_BUS)
@@ -629,6 +647,11 @@ fdt_addr_t dev_get_addr(struct udevice *dev)
 #endif
 }
 
+fdt_addr_t dev_get_addr(struct udevice *dev)
+{
+	return dev_get_addr_index(dev, 0);
+}
+
 bool device_has_children(struct udevice *dev)
 {
 	return !list_empty(&dev->child_head);

include/dm/device.h

@@ -454,6 +454,17 @@ int device_find_next_child(struct udevice **devp);
 fdt_addr_t dev_get_addr(struct udevice *dev);
 
 /**
+ * dev_get_addr_index() - Get the indexed reg property of a device
+ *
+ * @dev: Pointer to a device
+ * @index: the 'reg' property can hold a list of <addr, size> pairs
+ *	   and @index is used to select which one is required
+ *
+ * @return addr
+ */
+fdt_addr_t dev_get_addr_index(struct udevice *dev, int index);
+
+/**
  * device_has_children() - check if a device has any children
  *
  * @dev:	Device to check