flash: implement release() as part of flash_ops

include/flash.h

@@ -6,6 +6,7 @@
 struct flash_dev;
 
 struct flash_ops {
+	void (* release)(struct flash_dev *dev);
 	size_t (* get_size)(struct flash_dev *dev);
 	size_t (* get_capacity)(struct flash_dev *dev);
 	int (* read)(struct flash_dev *dev, uint32_t addr, void *data, size_t len);

source/core/flash.c

@@ -19,6 +19,14 @@ int default_flash_is_erased(struct flash_dev *dev, uint32_t addr)
 	return 1;
 }
 
+void flash_release(struct flash_dev *dev)
+{
+	if (!dev)
+		return;
+
+	dev->ops->release(dev);
+}
+
 size_t flash_get_size(struct flash_dev *dev)
 {
 	if (!dev)

source/drivers/sandbox_flash.c

@@ -26,8 +26,10 @@ static int stdio_flash_write(struct flash_dev *dev, uint32_t addr,
 static int stdio_flash_copy(struct flash_dev *dev, uint32_t dst, uint32_t src,
 	size_t len);
 static int stdio_flash_erase(struct flash_dev *dev, uint32_t addr);
+static void stdio_flash_release(struct flash_dev *dev);
 
 static struct flash_ops stdio_flash_ops = {
+	.release = stdio_flash_release,
 	.get_size = stdio_flash_get_size,
 	.read = stdio_flash_read,
 	.write = stdio_flash_write,
@@ -150,7 +152,7 @@ err_free_dev:
 	return NULL;
 }
 
-void flash_release(struct flash_dev *dev)
+static void stdio_flash_release(struct flash_dev *dev)
 {
 	struct stdio_flash_priv *priv;