From: Rafał Miłecki <rafal@xxxxxxxxxx> 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@xxxxxxxxxx> --- V2: Use "linux,rootfs" as more accurate. Thanks Rob. --- drivers/mtd/mtdcore.c | 7 +++++++ 1 file changed, 7 insertions(+) diff --git a/drivers/mtd/mtdcore.c b/drivers/mtd/mtdcore.c index 07249af4f890..034b06aff660 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> @@ -735,6 +736,12 @@ 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)) { + pr_info("mtd: setting mtd%d (%s) as root device\n", mtd->index, mtd->name); + ROOT_DEV = MKDEV(MTD_BLOCK_MAJOR, mtd->index); + } + /* 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 -- 2.34.1