48 lines
1.7 KiB
Diff
48 lines
1.7 KiB
Diff
From 26422ac78e9d8767bd4aabfbae616b15edbf6a1b Mon Sep 17 00:00:00 2001
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From: =?UTF-8?q?Rafa=C5=82=20Mi=C5=82ecki?= <rafal@milecki.pl>
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Date: Sat, 22 Oct 2022 23:13:18 +0200
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Subject: [PATCH] mtd: core: set ROOT_DEV for partitions marked as rootfs in DT
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MIME-Version: 1.0
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Content-Type: text/plain; charset=UTF-8
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Content-Transfer-Encoding: 8bit
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This adds support for "linux,rootfs" binding that is used to mark flash
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partition containing rootfs. It's useful for devices using device tree
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that don't have bootloader passing root info in cmdline.
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Signed-off-by: Rafał Miłecki <rafal@milecki.pl>
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Signed-off-by: Miquel Raynal <miquel.raynal@bootlin.com>
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Link: https://lore.kernel.org/linux-mtd/20221022211318.32009-2-zajec5@gmail.com
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---
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drivers/mtd/mtdcore.c | 12 ++++++++++++
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1 file changed, 12 insertions(+)
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--- a/drivers/mtd/mtdcore.c
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+++ b/drivers/mtd/mtdcore.c
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@@ -28,6 +28,7 @@
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#include <linux/leds.h>
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#include <linux/debugfs.h>
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#include <linux/nvmem-provider.h>
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+#include <linux/root_dev.h>
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#include <linux/mtd/mtd.h>
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#include <linux/mtd/partitions.h>
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@@ -737,6 +738,17 @@ int add_mtd_device(struct mtd_info *mtd)
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not->add(mtd);
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mutex_unlock(&mtd_table_mutex);
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+
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+ if (of_find_property(mtd_get_of_node(mtd), "linux,rootfs", NULL)) {
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+ if (IS_BUILTIN(CONFIG_MTD)) {
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+ pr_info("mtd: setting mtd%d (%s) as root device\n", mtd->index, mtd->name);
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+ ROOT_DEV = MKDEV(MTD_BLOCK_MAJOR, mtd->index);
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+ } else {
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+ pr_warn("mtd: can't set mtd%d (%s) as root device - mtd must be builtin\n",
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+ mtd->index, mtd->name);
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+ }
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+ }
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+
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/* We _know_ we aren't being removed, because
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our caller is still holding us here. So none
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of this try_ nonsense, and no bitching about it
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