linux-kernel - Re: [RESEND PATCH v3 7/8] mtd: spi-nor: Convert cadence-quadspi to use spi-mem framework

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Message-ID: <20200824140438.14e72ca6@collabora.com>
Date:   Mon, 24 Aug 2020 14:04:38 +0200
From:   Boris Brezillon <boris.brezillon@...labora.com>
To:     Vignesh Raghavendra <vigneshr@...com>
Cc:     Jan Kiszka <jan.kiszka@...mens.com>,
        Tudor Ambarus <tudor.ambarus@...rochip.com>,
        Mark Brown <broonie@...nel.org>,
        Boris Brezillon <bbrezillon@...nel.org>,
        Ramuthevar Vadivel Murugan 
        <vadivel.muruganx.ramuthevar@...ux.intel.com>,
        <linux-mtd@...ts.infradead.org>, <linux-kernel@...r.kernel.org>,
        <linux-spi@...r.kernel.org>, <simon.k.r.goldschmidt@...il.com>,
        <dinguyen@...nel.org>, <marex@...x.de>
Subject: Re: [RESEND PATCH v3 7/8] mtd: spi-nor: Convert cadence-quadspi to
 use spi-mem framework

On Mon, 24 Aug 2020 17:14:56 +0530
Vignesh Raghavendra <vigneshr@...com> wrote:

> Hi Jan,
> 
> On 8/24/20 11:25 AM, Jan Kiszka wrote:
> [...]
> 
> >> +MODULE_AUTHOR("Vignesh Raghavendra <vigneshr@...com>");
> >>  
> > On the AM65x, this changes mtd->name (thus mtd-id for
> > parser/cmdlinepart) from 47040000.spi.0 to spi7.0. The besides having to
> > deal with both names now, "spi7" sounds like it could easily change
> > again if someone plugs or unplugs some other SPI device. Is this intended?
> >   
> 
> You could use DT aliases to make sure OSPI0 is always at given bus num
> (say spi7):
> 
>         aliases {
>                 spi7 = &ospi0;
>         };

FWIW, we've added the ->get_name() method [1][2] to avoid such
regressions.

[1]https://elixir.bootlin.com/linux/latest/source/include/linux/spi/spi-mem.h#L218
[2]https://elixir.bootlin.com/linux/latest/source/drivers/spi/spi-fsl-qspi.c#L810