linux-kernel - Re: [PATCH] mtd: parser: cmdline: Support MTD names containing one or more colons

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Message-ID: <CAPAv03OXCAAPA7B8sAF-JX-8LSVHwk16Tnx_N-beRvZQXN7CVQ@mail.gmail.com>
Date:   Mon, 4 Jan 2021 08:24:25 -0800
From:   Ron Minnich <rminnich@...gle.com>
To:     Miquel Raynal <miquel.raynal@...tlin.com>
Cc:     Ian Goegebuer <goegebuer@...gle.com>,
        Vignesh Raghavendra <vigneshr@...com>,
        Tudor Ambarus <tudor.ambarus@...rochip.com>,
        Richard Weinberger <richard@....at>,
        Mika Westerberg <mika.westerberg@...ux.intel.com>,
        Boris Brezillon <bbrezillon@...nel.org>,
        Jethro Beekman <jethro@...tanix.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Alexander Sverdlin <alexander.sverdlin@...ia.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        linux-mtd@...ts.infradead.org,
        lkml - Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] mtd: parser: cmdline: Support MTD names containing one or
 more colons

It is likely we're missing something -- I am not fully checked out on
the Linux patch process and it's Ian's first patch.

Guidance appreciated.

On Mon, Jan 4, 2021 at 1:08 AM Miquel Raynal <miquel.raynal@...tlin.com> wrote:
>
> Hello Ian,
>
> Ian Goegebuer <goegebuer@...gle.com> wrote on Wed, 23 Dec 2020 13:56:30
> -0800:
>
> > On Intel platforms, the usable SPI area is located several
> > MiB in from the start, to leave room for descriptors and
> > the Management Engine binary. Further, not all the remaining
> > space can be used, as the last 16 MiB contains firmware.
> >
> > To make the SPI usable for mtdblock and other devices,
> > it is necessary to enable command line partitions so the
> > middle usable region can be specified.
> >
> > Add a part_probes array which includes only "cmdelineparts",
> > and change to mtd_device_parse_register to use this part_probes.
>
> The commit title seem to be taken from another patch and does not
> match the below change. Or am I missing something?
>
> > Signed-off-by: "Ronald G. Minnich" <rminnich@...gle.com>
> > Signed-off-by: Ian Goegebuer <goegebuer@...gle.com>
> > ---
> >  drivers/mtd/spi-nor/controllers/intel-spi.c | 5 ++++-
> >  1 file changed, 4 insertions(+), 1 deletion(-)
> >
> > diff --git a/drivers/mtd/spi-nor/controllers/intel-spi.c b/drivers/mtd/spi-nor/controllers/intel-spi.c
> > index b54a56a68100..9de38851c411 100644
> > --- a/drivers/mtd/spi-nor/controllers/intel-spi.c
> > +++ b/drivers/mtd/spi-nor/controllers/intel-spi.c
> > @@ -903,6 +903,8 @@ static const struct spi_nor_controller_ops intel_spi_controller_ops = {
> >       .erase = intel_spi_erase,
> >  };
> >
> > +static const char * const part_probes[] = { "cmdlinepart", NULL };
> > +
> >  struct intel_spi *intel_spi_probe(struct device *dev,
> >       struct resource *mem, const struct intel_spi_boardinfo *info)
> >  {
> > @@ -950,7 +952,8 @@ struct intel_spi *intel_spi_probe(struct device *dev,
> >       if (!ispi->writeable || !writeable)
> >               ispi->nor.mtd.flags &= ~MTD_WRITEABLE;
> >
> > -     ret = mtd_device_register(&ispi->nor.mtd, &part, 1);
> > +     ret = mtd_device_parse_register(&ispi->nor.mtd, part_probes,
> > +                                     NULL, &part, 1);
> >       if (ret)
> >               return ERR_PTR(ret);
> >
>
> Thanks,
> Miquèl