Re: [PATCH] mtd: spi-nor: Prefer asynchronous probe

[Michael Walle]

Hi,

Am 2020-10-03 19:00, schrieb Doug Anderson:
> On Sat, Oct 3, 2020 at 9:54 AM Michael Walle <michael@xxxxxxxx> wrote:
> > While debugging another issue I also noticed that sometimes my
> > /dev/mtdN devices were reordered. Note that I have two SPI flashes.
> > Might this also be connected to the async probe?
>
> It's likely.  My guess is that you shouldn't really be depending on
> the numbering.  If you need to depend on the numbering, there should
> be something that guarantees it like a device tree alias.  We have
> struggled with similar things on MMC for years and I guess Ulf finally
> decided that we weren't going to get a better solution than the device
> tree aliases.

But this has to be supported by spi-nor first, right? So that would also
be something which has to be added before we can make the probe async.
And as far as I know there is no such mechanism like /dev/disk/by-X for
/dev/mtdN.

-michael