diff options
| author | Rafał Miłecki <rafal@milecki.pl> | 2022-10-22 23:13:18 +0200 |
|---|---|---|
| committer | Miquel Raynal <miquel.raynal@bootlin.com> | 2022-11-07 17:14:18 +0100 |
| commit | 26422ac78e9d8767bd4aabfbae616b15edbf6a1b (patch) | |
| tree | 252d6af66c04ff551304badae21101d1beccdfc0 /drivers/mtd | |
| parent | 2b9a31d762f0441ab87cb76524c005adf54d6719 (diff) | |
| download | lwn-26422ac78e9d8767bd4aabfbae616b15edbf6a1b.tar.gz lwn-26422ac78e9d8767bd4aabfbae616b15edbf6a1b.zip | |
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.c | 12 |
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 |