From: "Rafał Miłecki" <zajec5@gmail.com>
To: Miquel Raynal <miquel.raynal@bootlin.com>,
Richard Weinberger <richard@nod.at>,
Vignesh Raghavendra <vigneshr@ti.com>,
Rob Herring <robh+dt@kernel.org>,
Krzysztof Kozlowski <krzysztof.kozlowski+dt@linaro.org>
Cc: "Mikhail Zhilkin" <csharper2005@gmail.com>,
"Christian Marangi" <ansuelsmth@gmail.com>,
"Wolfram Sang" <wsa+renesas@sang-engineering.com>,
"Chaitanya Kulkarni" <kch@nvidia.com>,
"Martin K . Petersen" <martin.petersen@oracle.com>,
"Jens Axboe" <axboe@kernel.dk>,
"Andrew Morton" <akpm@linux-foundation.org>,
linux-mtd@lists.infradead.org, devicetree@vger.kernel.org,
linux-kernel@vger.kernel.org, "Rafał Miłecki" <rafal@milecki.pl>
Subject: [PATCH V2 2/2] mtd: core: set ROOT_DEV for partitions marked as rootfs in DT
Date: Fri, 21 Oct 2022 08:00:51 +0200 [thread overview]
Message-ID: <20221021060051.2508-2-zajec5@gmail.com> (raw)
In-Reply-To: <20221021060051.2508-1-zajec5@gmail.com>
From: Rafał Miłecki <rafal@milecki.pl>
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>
---
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
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http://lists.infradead.org/mailman/listinfo/linux-mtd/
next prev parent reply other threads:[~2022-10-21 6:01 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-10-21 6:00 [PATCH V2 1/2] dt-bindings: mtd: partitions: support marking rootfs partition Rafał Miłecki
2022-10-21 6:00 ` Rafał Miłecki [this message]
2022-10-21 20:41 ` [PATCH V2 2/2] mtd: core: set ROOT_DEV for partitions marked as rootfs in DT kernel test robot
2022-10-22 10:20 ` kernel test robot
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