linux-kernel - Re: [PATCH] mtd: parsers: Support '[]' for id in mtdparts

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Date:   Thu, 16 Apr 2020 11:51:38 +0200
From:   Linus Walleij <linus.walleij@...aro.org>
To:     "Ronald G. Minnich" <rminnich@...il.com>
Cc:     Miquèl Raynal <miquel.raynal@...tlin.com>,
        rminnich@...gle.com, Richard Weinberger <richard@....at>,
        Vignesh R <vigneshr@...com>, linux-mtd@...ts.infradead.org,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] mtd: parsers: Support '[]' for id in mtdparts

On Mon, Apr 6, 2020 at 6:10 PM Ronald G. Minnich <rminnich@...il.com> wrote:

> The MTD subsystem can support command-line defined partitions
> for one or more MTD devices.
>
> The format is:
>  * mtdparts=<mtddef>[;<mtddef]
>  * <mtddef>  := <mtd-id>:<partdef>[,<partdef>]
>
> The ':' separates the id from the partdef.
>
> On PCI MTD devices, the name can be the PCI slot name,
> e.g. 0000:00:1f.5. There are two ':' in the name alone.
>
> Change the definition of <mtd-id> so it can be bracketed
> with '[]' and hence contain any number of ':'.
> An opening '[' must be matched with a closing ']'.
> The ':' continues to separate the mtd-id from the <partdef>.
>
> Signed-off-by: Ronald G. Minnich <rminnich@...gle.com>

It's a reasonable approach, I was a bit confused for a while
because [] is both used as literals and as meta-characters in the
syntax description which becomes a bit terse.

But it's no big deal so:
Reviewed- by: Linus Walleij <linus.walleij@...aro.org>

> Change-Id: I17a757e65f532b11606c7bb104f08837bcd444b9

Upstream don't like Gerrit IDs but surely the maintainer can drop
this when applying.

I suppose the use case is using PCI-based MTD devices for testing
something android images on desktops? I'm surprised it didn't
come up earlier.

Yours,
Linus Walleij