nvmem: core: export nvmem_add_cells_from_of()

This symbol can be cleanly re-used by the fixed NVMEM layout driver.
Allow passing DT node as argument to make it a bit more generic.

Signed-off-by: Rafał Miłecki <rafal@milecki.pl>

drivers/nvmem/core.c

@@ -694,15 +694,15 @@ static int nvmem_validate_keepouts(struct nvmem_device *nvmem)
 	return 0;
 }
 
-static int nvmem_add_cells_from_of(struct nvmem_device *nvmem)
+int nvmem_add_cells_from_of(struct nvmem_device *nvmem, struct device_node *np)
 {
 	struct nvmem_layout *layout = nvmem->layout;
 	struct device *dev = &nvmem->dev;
 	struct device_node *child;
 	const __be32 *addr;
 	int len, ret;
 
-	for_each_child_of_node(dev->of_node, child) {
+	for_each_child_of_node(np, child) {
 		struct nvmem_cell_info info = {0};
 
 		addr = of_get_property(child, "reg", &len);
@@ -739,6 +739,7 @@ static int nvmem_add_cells_from_of(struct nvmem_device *nvmem)
 
 	return 0;
 }
+EXPORT_SYMBOL_GPL(nvmem_add_cells_from_of);
 
 int __nvmem_layout_register(struct nvmem_layout *layout, struct module *owner)
 {
@@ -970,7 +971,7 @@ struct nvmem_device *nvmem_register(const struct nvmem_config *config)
 	if (rval)
 		goto err_remove_cells;
 
-	rval = nvmem_add_cells_from_of(nvmem);
+	rval = nvmem_add_cells_from_of(nvmem, nvmem->dev.of_node);
 	if (rval)
 		goto err_remove_cells;
 

include/linux/nvmem-provider.h

@@ -194,6 +194,8 @@ void nvmem_del_cell_table(struct nvmem_cell_table *table);
 int nvmem_add_one_cell(struct nvmem_device *nvmem,
 		       const struct nvmem_cell_info *info);
 
+int nvmem_add_cells_from_of(struct nvmem_device *nvmem, struct device_node *np);
+
 int __nvmem_layout_register(struct nvmem_layout *layout, struct module *owner);
 #define nvmem_layout_register(layout) \
 	__nvmem_layout_register(layout, THIS_MODULE)
@@ -225,6 +227,11 @@ static inline int nvmem_add_one_cell(struct nvmem_device *nvmem,
 	return -EOPNOTSUPP;
 }
 
+static int nvmem_add_cells_from_of(struct nvmem_device *nvmem, struct device_node *np)
+{
+	return -EOPNOTSUPP;
+}
+
 static inline int nvmem_layout_register(struct nvmem_layout *layout)
 {
 	return -EOPNOTSUPP;