diff options
| author | Vincent Whitchurch <vincent.whitchurch@axis.com> | 2022-04-12 16:52:59 +0300 |
|---|---|---|
| committer | Miquel Raynal <miquel.raynal@bootlin.com> | 2022-04-25 11:37:49 +0300 |
| commit | 82e214f6c0f16827ea7a95b8f96c651a7a7f8ac1 (patch) | |
| tree | e72f2034ac652fe3040fbebc0fc92c41a7776f4d /drivers/mtd/mtdcore.c | |
| parent | 9547c4e74f6b4b56c2f9e4e7a286ce126fd333fa (diff) | |
| download | linux-82e214f6c0f16827ea7a95b8f96c651a7a7f8ac1.tar.xz | |
mtd: core: Check devicetree alias for index
Allow the MTD index to be specified via a devicetree alias, so that the
number does not just depend on probe order. This is useful to allow
pseudo-devices like phram to be optionally used on systems, without
having this affect the numbering of the real hardware MTD devices.
Signed-off-by: Vincent Whitchurch <vincent.whitchurch@axis.com>
Signed-off-by: Miquel Raynal <miquel.raynal@bootlin.com>
Link: https://lore.kernel.org/linux-mtd/20220412135302.1682890-2-vincent.whitchurch@axis.com
Diffstat (limited to 'drivers/mtd/mtdcore.c')
| -rw-r--r-- | drivers/mtd/mtdcore.c | 11 |
1 files changed, 9 insertions, 2 deletions
diff --git a/drivers/mtd/mtdcore.c b/drivers/mtd/mtdcore.c index 7731796024e0..9eb0680db312 100644 --- a/drivers/mtd/mtdcore.c +++ b/drivers/mtd/mtdcore.c @@ -557,9 +557,10 @@ static int mtd_nvmem_add(struct mtd_info *mtd) int add_mtd_device(struct mtd_info *mtd) { + struct device_node *np = mtd_get_of_node(mtd); struct mtd_info *master = mtd_get_master(mtd); struct mtd_notifier *not; - int i, error; + int i, error, ofidx; /* * May occur, for instance, on buggy drivers which call @@ -598,7 +599,13 @@ int add_mtd_device(struct mtd_info *mtd) mutex_lock(&mtd_table_mutex); - i = idr_alloc(&mtd_idr, mtd, 0, 0, GFP_KERNEL); + ofidx = -1; + if (np) + ofidx = of_alias_get_id(np, "mtd"); + if (ofidx >= 0) + i = idr_alloc(&mtd_idr, mtd, ofidx, ofidx + 1, GFP_KERNEL); + else + i = idr_alloc(&mtd_idr, mtd, 0, 0, GFP_KERNEL); if (i < 0) { error = i; goto fail_locked; |