mtd: add support for parsing partitions defined in OF
Add support for parsing partitions defined in device-trees via the
`partitions` node with `fixed-partitions` compatible.
The `mtdparts`/`mtdids` mechanism takes precedence. If some partitions
are defined for a MTD device via this mechanism, the code won't register
partitions for that MTD device from OF, even if they are defined.
Signed-off-by: Marek Behún <marek.behun@nic.cz>
Reviewed-by: Miquel Raynal <miquel.raynal@bootlin.com>
Tested-by: Patrice Chotard <patrice.chotard@foss.st.com>
Reviewed-by: Jagan Teki <jagan@amarulasolutions.com>
Cc: Simon Glass <sjg@chromium.org>
Cc: Heiko Schocher <hs@denx.de>
Cc: Patrick Delaunay <patrick.delaunay@st.com>
diff --git a/drivers/mtd/mtdpart.c b/drivers/mtd/mtdpart.c
index d064ac3..aa58f72 100644
--- a/drivers/mtd/mtdpart.c
+++ b/drivers/mtd/mtdpart.c
@@ -892,6 +892,69 @@
return 0;
}
+#if CONFIG_IS_ENABLED(DM) && CONFIG_IS_ENABLED(OF_CONTROL)
+int add_mtd_partitions_of(struct mtd_info *master)
+{
+ ofnode parts, child;
+ int i = 0;
+
+ if (!master->dev)
+ return 0;
+
+ parts = ofnode_find_subnode(mtd_get_ofnode(master), "partitions");
+ if (!ofnode_valid(parts) || !ofnode_is_available(parts) ||
+ !ofnode_device_is_compatible(parts, "fixed-partitions"))
+ return 0;
+
+ ofnode_for_each_subnode(child, parts) {
+ struct mtd_partition part = { 0 };
+ struct mtd_info *slave;
+ fdt_addr_t offset, size;
+
+ if (!ofnode_is_available(child))
+ continue;
+
+ offset = ofnode_get_addr_size_index_notrans(child, 0, &size);
+ if (offset == FDT_ADDR_T_NONE || !size) {
+ debug("Missing partition offset/size on \"%s\" partition\n",
+ master->name);
+ continue;
+ }
+
+ part.name = ofnode_read_string(child, "label");
+ if (!part.name)
+ part.name = ofnode_read_string(child, "name");
+
+ /*
+ * .mask_flags is used to remove flags in allocate_partition(),
+ * so when "read-only" is present, we add MTD_WRITABLE to the
+ * mask, and so MTD_WRITABLE will be removed on partition
+ * allocation
+ */
+ if (ofnode_read_bool(child, "read-only"))
+ part.mask_flags |= MTD_WRITEABLE;
+ if (ofnode_read_bool(child, "lock"))
+ part.mask_flags |= MTD_POWERUP_LOCK;
+
+ part.offset = offset;
+ part.size = size;
+ part.ecclayout = master->ecclayout;
+
+ slave = allocate_partition(master, &part, i++, 0);
+ if (IS_ERR(slave))
+ return PTR_ERR(slave);
+
+ mutex_lock(&mtd_partitions_mutex);
+ list_add_tail(&slave->node, &master->partitions);
+ mutex_unlock(&mtd_partitions_mutex);
+
+ add_mtd_device(slave);
+ }
+
+ return 0;
+}
+#endif /* CONFIG_IS_ENABLED(DM) && CONFIG_IS_ENABLED(OF_CONTROL) */
+
#ifndef __UBOOT__
static DEFINE_SPINLOCK(part_parser_lock);
static LIST_HEAD(part_parsers);