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authorRafał Miłecki <rafal@milecki.pl>2022-10-23 00:13:18 +0300
committerMiquel Raynal <miquel.raynal@bootlin.com>2022-11-07 19:14:18 +0300
commit26422ac78e9d8767bd4aabfbae616b15edbf6a1b (patch)
tree252d6af66c04ff551304badae21101d1beccdfc0 /drivers/mtd
parent2b9a31d762f0441ab87cb76524c005adf54d6719 (diff)
downloadlinux-26422ac78e9d8767bd4aabfbae616b15edbf6a1b.tar.xz
mtd: core: set ROOT_DEV for partitions marked as rootfs in DT
This adds support for "linux,rootfs" binding that is used to mark flash partition containing rootfs. It's useful for devices using device tree that don't have bootloader passing root info in cmdline. Signed-off-by: Rafał Miłecki <rafal@milecki.pl> Signed-off-by: Miquel Raynal <miquel.raynal@bootlin.com> Link: https://lore.kernel.org/linux-mtd/20221022211318.32009-2-zajec5@gmail.com
Diffstat (limited to 'drivers/mtd')
-rw-r--r--drivers/mtd/mtdcore.c12
1 files changed, 12 insertions, 0 deletions
diff --git a/drivers/mtd/mtdcore.c b/drivers/mtd/mtdcore.c
index 756fd27f4cfe..e0193054f8d9 100644
--- a/drivers/mtd/mtdcore.c
+++ b/drivers/mtd/mtdcore.c
@@ -28,6 +28,7 @@
#include <linux/leds.h>
#include <linux/debugfs.h>
#include <linux/nvmem-provider.h>
+#include <linux/root_dev.h>
#include <linux/mtd/mtd.h>
#include <linux/mtd/partitions.h>
@@ -737,6 +738,17 @@ int add_mtd_device(struct mtd_info *mtd)
not->add(mtd);
mutex_unlock(&mtd_table_mutex);
+
+ if (of_find_property(mtd_get_of_node(mtd), "linux,rootfs", NULL)) {
+ if (IS_BUILTIN(CONFIG_MTD)) {
+ pr_info("mtd: setting mtd%d (%s) as root device\n", mtd->index, mtd->name);
+ ROOT_DEV = MKDEV(MTD_BLOCK_MAJOR, mtd->index);
+ } else {
+ pr_warn("mtd: can't set mtd%d (%s) as root device - mtd must be builtin\n",
+ mtd->index, mtd->name);
+ }
+ }
+
/* We _know_ we aren't being removed, because
our caller is still holding us here. So none
of this try_ nonsense, and no bitching about it