efi: Add a bootdev for EFI media

Bootstd needs a driver so that it can scan EFI media within the EFI app.
Add one.

Signed-off-by: Simon Glass <sjg@chromium.org>

drivers/block/efi_blk.c

@@ -9,6 +9,7 @@
  */
 
 #include <blk.h>
+#include <bootdev.h>
 #include <dm.h>
 #include <efi.h>
 #include <efi_api.h>
@@ -79,6 +80,31 @@ static const struct blk_ops efi_blk_ops = {
 	.write	= efi_bl_write,
 };
 
+static int efi_bootdev_bind(struct udevice *dev)
+{
+	struct bootdev_uc_plat *ucp = dev_get_uclass_plat(dev);
+
+	ucp->prio = BOOTDEVP_3_INTERNAL_SLOW;
+
+	return 0;
+}
+
+struct bootdev_ops efi_bootdev_ops = {
+};
+
+static const struct udevice_id efi_bootdev_ids[] = {
+	{ .compatible = "u-boot,bootdev-efi" },
+	{ }
+};
+
+U_BOOT_DRIVER(efi_bootdev) = {
+	.name		= "efi_bootdev",
+	.id		= UCLASS_BOOTDEV,
+	.ops		= &efi_bootdev_ops,
+	.bind		= efi_bootdev_bind,
+	.of_match	= efi_bootdev_ids,
+};
+
 U_BOOT_DRIVER(efi_block) = {
 	.name		= "efi_block",
 	.id		= UCLASS_BLK,
@@ -103,6 +129,10 @@ static int efi_media_bind(struct udevice *dev)
 	blk_plat = dev_get_plat(blk);
 	blk_plat->blkio = plat->blkio;
 
+	ret = bootdev_setup_for_sibling_blk(blk, "efi_bootdev");
+	if (ret)
+		return log_msg_ret("emb", ret);
+
 	return 0;
 }