kernel: import pending patches adding support for NVMEM on UBI and MMC

Similar to supporting nvmem-layouts on MTD devices, also allow referencing
UBI and MMC devices in DT.

Signed-off-by: Daniel Golle <daniel@makrotopia.org>

1 files changed, 65 insertions, 0 deletions

diff --git a/target/linux/generic/pending-6.1/450-06-mtd-ubi-populate-ubi-volume-fwnode.patch b/target/linux/generic/pending-6.1/450-06-mtd-ubi-populate-ubi-volume-fwnode.patch
new file mode 100644
index 0000000000..1322766965
--- /dev/null
+++ b/target/linux/generic/pending-6.1/450-06-mtd-ubi-populate-ubi-volume-fwnode.patch
@@ -0,0 +1,65 @@
+From 3a041ee543cdf2e707a1dd72946cd6a583509b28 Mon Sep 17 00:00:00 2001
+From: Daniel Golle <daniel@makrotopia.org>
+Date: Fri, 21 Jul 2023 19:26:37 +0100
+Subject: [PATCH 06/15] mtd: ubi: populate ubi volume fwnode
+
+Look for the 'volumes' subnode of an MTD partition attached to a UBI
+device and attach matching child nodes to UBI volumes.
+This allows UBI volumes to be referenced in device tree, e.g. for use
+as NVMEM providers.
+
+Signed-off-by: Daniel Golle <daniel@makrotopia.org>
+---
+ drivers/mtd/ubi/vmt.c | 27 +++++++++++++++++++++++++++
+ 1 file changed, 27 insertions(+)
+
+--- a/drivers/mtd/ubi/vmt.c
++++ b/drivers/mtd/ubi/vmt.c
+@@ -124,6 +124,31 @@ static void vol_release(struct device *d
+ 	kfree(vol);
+ }
+ 
++static struct fwnode_handle *find_volume_fwnode(struct ubi_volume *vol)
++{
++	struct fwnode_handle *fw_vols, *fw_vol;
++	const char *volname;
++	u32 volid;
++
++	fw_vols = device_get_named_child_node(vol->dev.parent->parent, "volumes");
++	if (!fw_vols)
++		return NULL;
++
++	fwnode_for_each_child_node(fw_vols, fw_vol) {
++		if (!fwnode_property_read_string(fw_vol, "volname", &volname) &&
++		    strncmp(volname, vol->name, vol->name_len))
++			continue;
++
++		if (!fwnode_property_read_u32(fw_vol, "volid", &volid) &&
++		    vol->vol_id != volid)
++			continue;
++
++		return fw_vol;
++	}
++
++	return NULL;
++}
++
+ /**
+  * ubi_create_volume - create volume.
+  * @ubi: UBI device description object
+@@ -223,6 +248,7 @@ int ubi_create_volume(struct ubi_device
+ 	vol->name_len  = req->name_len;
+ 	memcpy(vol->name, req->name, vol->name_len);
+ 	vol->ubi = ubi;
++	device_set_node(&vol->dev, find_volume_fwnode(vol));
+ 
+ 	/*
+ 	 * Finish all pending erases because there may be some LEBs belonging
+@@ -605,6 +631,7 @@ int ubi_add_volume(struct ubi_device *ub
+ 	vol->dev.class = &ubi_class;
+ 	vol->dev.groups = volume_dev_groups;
+ 	dev_set_name(&vol->dev, "%s_%d", ubi->ubi_name, vol->vol_id);
++	device_set_node(&vol->dev, find_volume_fwnode(vol));
+ 	err = device_register(&vol->dev);
+ 	if (err) {
+ 		cdev_del(&vol->cdev);