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

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Date:   Mon, 24 Aug 2020 15:52:42 +0200
From:   Jan Kiszka <jan.kiszka@...mens.com>
To:     Boris Brezillon <boris.brezillon@...labora.com>,
        Vignesh Raghavendra <vigneshr@...com>
Cc:     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 24.08.20 14:04, Boris Brezillon wrote:
> 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
> 

OK, that reads like I was not the first to run into this.

Vignesh, please use it so that I can drop the local workaround.

Thanks,
Jan

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